DATAMETRICS CORP
8-K, 1999-09-13
COMPUTER PERIPHERAL EQUIPMENT, NEC
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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM 8-K

                                 CURRENT REPORT

                       Pursuant to Section 13 or 15(d) of
                       the Securities Exchange Act of 1934



                                September 4, 1999
                                -----------------
                Date of Report (Date of earliest event reported)



                             DATAMETRICS CORPORATION
                             -----------------------
             (Exact name of registrant as specified in its charter)


                                    Delaware
                                    --------
                 (State or other jurisdiction of incorporation)


         0-8567                                                  95-3545701
         ------                                                  ----------
(Commission File Number)                                      (I.R.S. Employer
                                                             Identification No.)


   25B Hanover Road, Florham Park, NJ                              07932
   ----------------------------------                              -----
(Address of principal executive offices)                         (Zip Code)


                                 (973) 377-3900
                                 --------------
               Registrant's telephone number, including area code

                                 Not Applicable
                                 --------------
          (Former name or former address, if changed since last report)


<PAGE>

ITEM 5. OTHER EVENTS.

        The Company has established a $1,500,000 revolving line of credit ("Line
of Credit") with Branch Banking and Trust Company ("Branch  Bank").  The Line of
Credit  accrues  interest at a variable  rate equal to Branch  Bank's Prime Rate
plus  0.5%.  The Line of Credit is  secured  by the  assets of the  Company  and
guarantees   by  two   guarantors   in  the   aggregate   amount  of  $1,500,000
("Guarantees")  that are secured by letters of credit  issued on the accounts of
each of the  guarantors.  In  consideration  of the  Guarantees,  the guarantors
received Warrants to purchase up to an aggregate  1,500,000 shares of the Common
Stock of the Company,  $.01 par value,  for a purchase  price of $1.00 per share
("Guarantee  Warrants"),  pursuant  to an  arrangement  made in July  1999.  The
Company also issued Warrants to purchase up to 75,000 shares of the Common Stock
of the  Company  for a  purchase  price of $1.10 per  share to a third  party as
compensation for arranging the guarantee ("Finder Warrants"). The Line of Credit
expires on August 25, 2000.

        The Company  applied a portion of the  proceeds of its Line of Credit to
fund the payment of the remaining  $750,000 in principal  amount  outstanding of
its 10% Senior Subordinated Secured Debentures in default, plus accrued interest
thereon.  Through this payment,  the Company has funded the retirement of all of
its debt to security-holders in default.

        In addition to the retirement of debt to  security-holders,  proceeds of
the Line of Credit are to be used for working  capital.  It is anticipated  that
any proceeds  received by the Registrant  upon the exercise of the Warrants will
be used for working capital.

        The above discussion is qualified in its entirety by reference to a Loan
Agreement,  Promissory Note, Security Agreement and the Guarantees,  executed in
favor of Branch Bank, and the Guarantee Warrants and the Finder Warrants, all of
which are  substantially  the same as Exhibits 4.1, 4.2, 4.3, 10.1,  10.2, 10.3,
and 10.4, respectively, and are incorporated herein by this reference.


ITEM 7.     FINANCIAL STATEMENTS AND EXHIBITS.

            a.       Financial statements of business acquired.

                     Not Applicable.

            b.       Pro forma financial information.

                     Not Applicable.

                                      -2-

<PAGE>


            c.       Exhibits.

                     The following exhibits are filed with this report:

                     Exhibit No.      Title.

                     4.1              Warrant issued to Carl K. Doumani.

                     4.2              Warrant issued to Roy Doumani.

                     4.3              Form of Warrant issued to finder.

                     10.1             Loan Agreement with Branch Bank, dated as
                                      of August 20,1999.

                     10.2             Promissory Note payable to Branch Bank,
                                      dated as of August 20, 1999

                     10.3             Security Agreement and Addendum with
                                      Branch Bank, dated as of August 20, 1999.


                     10.4             Form of Guarantee and Addendum of each of
                                      the guarantors.

                                      -3-

<PAGE>

                                   SIGNATURES

     Pursuant to the  requirements  of the Securities  Exchange Act of 1934, the
Registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned hereunto duly authorized.

                                               DATAMETRICS CORPORATION


                                        By: /s/ Daniel P. Ginns
                                            --------------------------
                                            Daniel P. Ginns
                                            Chairman and Chief Executive Officer


Dated: September 9, 1999

                                       -4-

<PAGE>

                                  EXHIBIT INDEX

4.1         Warrant issued to Carl K. Doumani.

4.2         Warrant issued to Roy Doumani.

4.3         Form of Warrant issued to finder.

10.1        Loan Agreement with Branch Bank, dated as of August 20, 1999.

10.2        Promissory Note payable to Branch Bank, dated as of August 20, 1999.

10.3        Security Agreement and Addendum with Branch Bank, dated as of
            August 20, 1999.

10.4        Form of Guarantee and Addendum of each of the guarantors.


                                      -5-


NEITHER THIS WARRANT NOR ANY SHARES OF COMMON STOCK  ISSUABLE  UPON THE EXERCISE
OF THIS  WARRANT  HAVE BEEN  REGISTERED  UNDER THE  SECURITIES  ACT OF 1933,  AS
AMENDED,  AND THE RULES AND REGULATIONS  PROMULGATED  THEREUNDER (THE "ACT"), OR
APPLICABLE  STATE  SECURITIES  LAWS.  THIS WARRANT AND THE COMMON STOCK ISSUABLE
UPON EXERCISE OF THIS WARRANT MAY NOT BE OFFERED, SOLD, TRANSFERRED OR OTHERWISE
DISPOSED OF IN THE ABSENCE OF  REGISTRATION  UNDER THE ACT OR  APPLICABLE  STATE
SECURITIES LAWS UNLESS DATAMETRICS  CORPORATION (THE "COMPANY") HAS RECEIVED THE
WRITTEN   OPINION  OF  THE  COMPANY'S   COUNSEL  OR  OTHER  COUNSEL   REASONABLY
SATISFACTORY THE COMPANY THAT, AFTER  INVESTIGATION OF THE RELEVANT FACTS,  SUCH
COUNSEL IS OF THE OPINION THAT SUCH  TRANSACTION  DOES NOT REQUIRE  REGISTRATION
UNDER THE ACT OR APPLICABLE STATE SECURITIES LAWS.


Warrant No.                                                       500,000 Shares
           -----

                        WARRANT TO PURCHASE COMMON STOCK
                                       OF
                             DATAMETRICS CORPORATION

         VOID AFTER 5:00 P.M., EASTERN DAYLIGHT TIME, ON AUGUST 31, 2004


         This  certifies  that,  for  value  received,  CARL K.  DOUMANI  or his
permissible transferees,  designees,  successors and assigns (collectively,  the
"HOLDER"),  is entitled,  subject to the terms set forth below, to purchase from
Datametrics Corporation, a Delaware corporation (the "COMPANY"), SO MUCH OF FIVE
HUNDRED THOUSAND  (500,000) SHARES OF THE COMPANY'S COMMON STOCK, PAR VALUE $.01
PER SHARE (THE "COMMON STOCK"),  AS ARE THEN AVAILABLE  PURSUANT TO THE SCHEDULE
SET FORTH IN SECTION 1 HEREOF,  upon surrender hereof, as hereinafter  provided,
at the  exercise  price of $1.00 per share of Common  Stock.  The number of, and
exercise  price for,  such shares of Common Stock are subject to  adjustment  as
provided  herein.  This  Warrant  is  being  issued  in  connection  with and in
consideration  of the initial Holder's  secured  guarantee  ("Guarantee") of the
Company's secured revolving line of credit in the amount of $500,000 pursuant to
an Intercreditor  and  Reimbursement  Agreement of even date between the initial
Holder  and  the  Company.   For  purposes  hereof,  the  phrase  "Guarantee  is
Outstanding"  shall  mean  that the  Guarantee  has  continuously  from the date
hereof,  and as of the date of such  determination,  (i) been in full  force and
effect;  (ii) been fully secured in accordance  with the terms of the agreements
between the Company and the initial Holder,  or the Company,  the initial Holder
and the Bank; and (iii) not been  breached,  released,  canceled,  terminated or
surrendered.

         1. VESTING OF WARRANTS.  This Warrant is exercisable immediately by the
Holder in whole or in part,  at any time and from time to time  during  the term
hereof,  with respect to 166,667  shares of Common  Stock.  This Warrant also is
exercisable at any time during the term hereof with

                                      -1-

<PAGE>

respect to  additional  shares of Common Stock  increasing  by 16,667  shares of
Common Stock per month,  commencing  on September 1, 1999 and  continuing on the
first day of each month until August 1, 2000.  Thereafter,  if the  Guarantee is
Outstanding  on March 1, 2000 and this Warrant is exercisable at any time during
the term for an  additional  133,333  shares  of Common  Stock.  Notwithstanding
anything  to the  contrary  herein  contained,  this  Warrant  shall be canceled
automatically  as to all  shares  of  Common  Stock  as to  which it is not then
exercisable at the moment that the Guarantee is not Outstanding.

         2. EXERCISE. This Warrant may be exercised by the Holder in whole or in
part from time to time  commencing  on the date  hereof  and  terminating  on or
before 5:00 p.m.,  New York time,  on August 31, 2004 (the  "WARRANT  EXPIRATION
Date"),  with respect to the shares of Common Stock from time to time  available
in accordance  with Section 1 hereof,  upon his tendering this Warrant (with the
Notice of Exercise  annexed  hereto duly completed and executed on behalf of the
Holder),  and payment in cash or by check  acceptable  to the  Company,  for the
purchase  price of the shares to be  purchased  at the office of the Company (or
such  other  office or agency of the  Company as it may  designate  by notice in
writing to the Holder at the address of the Holder appearing on the books of the
Company).  To the extent not exercised prior to the Warrant Expiration Date this
Warrant  shall become void and all rights  thereunder  and all rights in respect
thereof shall cease as of such time.

         3.  RIGHTS UPON  EXERCISE.  This  Warrant  shall be deemed to have been
exercised  immediately  prior  to the  close  of  business  on the  date  of its
surrender for exercise as provided in Section 2 hereof,  and the person entitled
to receive  the shares of Common  Stock  issuable  upon such  exercise  shall be
treated for all  purposes as the holder of record of such shares as of the close
of business on such date.  Unless  exercised in connection  with an underwritten
public  offering,  as promptly as  practicable  on or after such date and in any
event within seven (7) days  thereafter,  the Company at its expense shall issue
and deliver to the person or persons  entitled to receive the same a certificate
or  certificates  for the number of shares  issuable upon such exercise.  In the
event that this Warrant is  exercised  in part,  the Company at its expense will
execute and deliver a new  Warrant of like tenor  exercisable  for the number of
shares for which this Warrant may then be exercised. In the event of exercise at
the  time  of  an  underwritten  public  offering,   the  Company  will  provide
instructions   as  to  the   exercise  of  this  Warrant  and  the  issuance  of
certificates.

         4. NO  FRACTIONAL  SHARES  OR  SCRIP.  No  fractional  shares  or scrip
representing  fractional  shares  shall  be  issued  upon the  exercise  of this
Warrant.  In lieu of any fractional share to which the Holder would otherwise be
entitled,  the Company  shall make a cash payment  equal to the  exercise  price
multiplied by such fraction.

         5.  REPLACEMENT  OF  WARRANT.   Upon  receipt  of  evidence  reasonably
satisfactory to the Company, in its sole and absolute  discretion,  of the loss,
theft, destruction or mutilation of this Warrant and, in the case of loss, theft
or destruction,  upon delivery of an indemnity agreement reasonably satisfactory
in form  and  substance  to the  Company  or,  in the case of  mutilation,  upon
surrender and  cancellation  of this  Warrant,  the Company at its expense shall
execute and deliver,  in lieu of this  Warrant,  a new warrant of like tenor and
amount.

                                      -2-

<PAGE>

         6. RIGHTS OF STOCKHOLDERS.  The Holder shall not be entitled to vote or
receive  dividends  or be  deemed  the  holder  of  Common  Stock  or any  other
securities  of the  Company  that may at any time be  issuable  on the  exercise
hereof for any  purpose,  nor shall  anything  contained  herein be construed to
confer  upon the  Holder,  as such,  any of the rights of a  stockholder  of the
Company or any right to vote for the  election of  directors  or upon any matter
submitted to stockholders at any meeting thereof, or to give or withhold consent
to any corporate action (whether upon any  recapitalization,  issuance of stock,
reclassification  of stock,  consolidation,  merger or  otherwise) or to receive
notices of meetings, or to receive dividends or subscription rights or otherwise
until the  Warrant  shall have been  exercised  and the  shares of Common  Stock
purchasable upon the exercise hereof shall have been issued, as provided herein.

         7. COMPLIANCE WITH SECURITIES LAWS. (a) The Holder of this Warrant,  by
acceptance  hereof,  acknowledges  that the shares of Common  Stock to be issued
upon exercise  hereof are being acquired solely for the Holder's own account and
not as a nominee for any other party,  and for  investment,  and that the Holder
will not offer,  sell or  otherwise  dispose of any shares of Common Stock to be
issued upon exercise hereof,  except under circumstances that will not result in
a violation of the United States Securities Act of 1933, as amended (the "ACT"),
or any foreign or state  securities  laws.  Upon exercise of this  Warrant,  the
Holder  shall,  if  requested  by the  Company,  confirm in  writing,  in a form
satisfactory  to the Company,  that the shares of Common Stock so purchased  are
being acquired solely for the Holder's, own account and not as a nominee for any
other party, for investment, and not with a view toward distribution or resale.

                  (b) All shares of Common Stock issued upon exercise hereof may
be stamped or  imprinted  with the  following  legend (in addition to any legend
required by the Act and the  securities  laws of any state of the United States)
as determined by counsel for the Company:

         THESE  SHARES  HAVE  NOT  BEEN  REGISTERED   UNDER  THE  UNITED  STATES
         SECURITIES  ACT OF 1933,  AS  AMENDED,  AND THE RULES  AND  REGULATIONS
         PROMULGATED  THEREUNDER  (THE "ACT"),  OR APPLICABLE  STATE  SECURITIES
         LAWS, AND MAY NOT BE OFFERED,  SOLD,  TRANSFERRED OR OTHERWISE DISPOSED
         OF IN THE ABSENCE OF  REGISTRATION  UNDER THE ACT OR  APPLICABLE  STATE
         SECURITIES  LAWS UNLESS  DATAMETRICS  CORPORATION  (THE  "COMPANY") HAS
         RECEIVED THE WRITTEN OPINION OF THE COMPANY'S  COUNSEL OR OTHER COUNSEL
         REASONABLY SATISFACTORY TO THE COMPANY THAT, AFTER INVESTIGATION OF THE
         RELEVANT  FACTS,  SUCH COUNSEL IS OF THE OPINION THAT SUCH  TRANSACTION
         DOES  NOT  REQUIRE  REGISTRATION  UNDER  THE  ACT OR  APPLICABLE  STATE
         SECURITIES LAWS.

         8.  RESTRICTIONS ON TRANSFER OF UNDERLYING  COMMON STOCK. The Holder of
this  Warrant by  acceptance  hereof  agrees that the  transfer of the shares of
Common Stock issuable upon the exercise of all or any portion of this Warrant is
subject to the provisions of this Warrant, which include certain restrictions on
the transfer of such shares of Common Stock.

                                      -3-

<PAGE>

         9. RESERVATION OF COMMON STOCK. The Company hereby covenants and agrees
that during the term that this Warrant is exercisable,  the Company will reserve
from its authorized and unissued  shares of Common Stock a sufficient  number of
shares to provide  for the  issuance of Common  Stock upon the  exercise of this
Warrant  and,  from time to time,  will take all  steps  necessary  to amend its
Certificate of Incorporation to provide a sufficient reserve of shares of Common
Stock issuable upon exercise of the Warrant.  The Company further covenants that
all shares that may be issued upon the  exercise of rights  represented  by this
Warrant and payment of the exercise price, all as set forth herein, will be free
from all taxes,  liens and charges in respect of the issue  thereof  (other than
taxes in  respect  of any  transfer  occurring  contemporaneously  or  otherwise
specified  herein).  The Company  agrees that its issuance of this Warrant shall
constitute  full  authority  to its  officers  who are charged  with the duty of
executing stock certificates to execute and issue the necessary certificates for
shares of Common Stock upon the exercise of this Warrant.

         10.  NOTICES.  (a)  Whenever  the  exercise  price or  number of shares
purchasable  hereunder  shall be  adjusted  pursuant  to Section 12 hereof,  the
Company shall issue a  certificate  signed by its Secretary  setting  forth,  in
reasonable  detail,  the  event  requiring  the  adjustment,  the  amount of the
adjustment,  the method by which such adjustment was calculated and the exercise
price and number of shares  purchasable  hereunder  after giving  effect to such
adjustment,  and shall cause a copy of such  certificate  to be mailed (by first
class mail, postage prepaid to the Holder of this Warrant.

                  (b) In  case:  (i) the  Company  shall  take a  record  of the
holders of its Common Stock (or other stock or securities at the time receivable
upon the exercise of this Warrant) for the purpose of entitling  them to receive
any dividend or other  distribution,  or any right to subscribe  for or purchase
any  shares of stock of any class or any other  securities,  or to  receive  any
other  right;  or  (ii)  of  any  capital  reorganization  of the  Company,  any
reclassification  of the capital  stock of the  Company,  any  consolidation  or
merger of the Company with or into another  corporation,  or any sale,  lease or
conveyance of all or  substantially  all of the assets of the Company to another
person; or (iii) of any voluntary dissolution,  liquidation or winding-up of the
Company,  then,  and in each such  case,  the  Company  will mail or cause to be
mailed to the  Holder a notice  specifying,  as the case may be, (A) the date on
which a record is to be taken for the purpose of such dividend,  distribution or
right,  and stating the amount and character of such dividend,  distribution  or
right,  or  (B)  the  date  on  which  such  reorganization,   reclassification,
consolidation,  merger, conveyance, dissolution, liquidation or winding-up is to
take  place,  and the time,  if any is to be fixed,  as of which the  holders of
record of Common Stock (or such stock or securities at the time  receivable upon
the  exercise of this  Warrant)  shall be entitled to exchange  their  shares of
Common  Stock  (or such  other  stock or  securities)  for  securities  or other
property deliverable upon such reorganization, reclassification,  consolidation,
merger, conveyance, dissolution, liquidation or winding-up. Such notice shall be
mailed at least ten (10) days prior to the date therein specified.

                  (c) All such  notices  and  communications  shall be deemed to
have been  received  (i) in the case of personal  delivery,  on the date of such
delivery and (ii) in the case of mailing,  on the second  business day following
the date of such mailing.

                                      -4-

<PAGE>

         11.  AMENDMENTS.  (a) Any term of this  Warrant may be amended with the
written  consent of the Company and the holders of warrants  which, if exercised
would  then  represent  not less than a majority  of the shares of Common  Stock
issuable upon exercise of any and all outstanding  warrants for shares of Common
Stock  issued by the Company on the date hereof (the "COMMON  STOCK  WARRANTS"),
even  without the  specific  consent of the  Holder.  An  amendment  effected in
accordance  with this Section 11 shall be binding upon each holder of any of the
Common Stock Warrants, each future holder of all such Common Stock Warrants, and
the Company.  The Company  shall  promptly  give notice to all holders of Common
Stock Warrants of any amendment effected in accordance with this Section 11.

                  (b) No  waivers of or  exceptions  to any term,  condition  or
provision of this Warrant, in any one or more instances,  shall be deemed to be,
or construed as, a further or continuing  waiver of any such term,  condition or
provision.

         12.  ADJUSTMENTS;  ANTIDILUTION.  The exercise prices and the number of
shares  purchasable  hereunder  are subject to  adjustment  from time to time as
follows:

                  (a) MERGER,  SALE OF ASSETS,  ETC. If at any time,  while this
Warrant, or any portion thereof, is outstanding and unexpired there shall be (i)
a  reorganization  (other  than  a  combination,  reclassification  exchange  or
subdivision  of  shares  otherwise  provided  for  herein),  (ii)  a  merger  or
consolidation  of the  Company  with or into  another  corporation  in which the
Company is not the surviving person, or a reverse triangular merger in which the
Company is the surviving  person but the shares of the  Company's  capital stock
outstanding  immediately  prior to the  merger  are  converted  by virtue of the
merger  into  other  property,  whether  in the  form  of  cash,  securities  or
otherwise,  or (iii) a sale or transfer of the Company's  properties  and assets
as, or  substantially  as, an entirety to any other  person,  then, as a part of
such reorganization,  merger, consolidation,  sale or transfer, lawful provision
shall be made so that the Holder  shall  thereafter  be entitled to receive upon
exercise of this Warrant, during the period specified herein and upon payment of
the  exercise  price  then in  effect,  the  number  of shares of stock or other
securities  or  property  of  the  successor  corporation  resulting  from  such
reorganization,  merger,  consolidation,  sale or transfer which a holder of the
shares  deliverable  upon  exercise of this Warrant  would have been entitled to
receive in such reorganization,  consolidation, merger, sale or transfer if this
Warrant  had been  exercised  immediately  before such  reorganization,  merger,
consolidation,  sale or transfer,  all subject to further adjustment as provided
in this  Section  12. The  foregoing  provisions  of this  subsection  (a) shall
similarly apply to successive  reorganizations,  consolidations,  mergers, sales
and transfers and to the stock or securities of any other  corporation which are
at the time  receivable  upon the  exercise  of this  Warrant.  If the per share
consideration  payable  to the Holder  for  shares in  connection  with any such
transaction  is in a form other  than cash or  marketable  securities,  then the
value of such  consideration  shall be determined in good faith by the Company's
Board of  Directors,  whose  determination  shall be final and  binding.  In all
events,  appropriate  adjustment  (as  determined in good faith by the Company's
Board of Directors)  shall be made in the  application of the provisions of this
Warrant  with  respect  to the  rights and  interests  of the  Holder  after the
transaction,  to the end that the provisions of this Warrant shall be applicable
after that event,  as nearly as reasonably  may be, in relation to any shares or
other property deliverable after that event upon exercise of this Warrant.

                                      -5-

<PAGE>

                  (b)  RECLASSIFICATION,  etc.  If the Company at any time while
this Warrant,  or any portion thereof,  remains outstanding and unexpired shall,
by reclassification of securities or otherwise,  change any of the securities as
to which  purchase  rights under this Warrant exist into the same or a different
number  of  securities  of any  other  class  or  classes,  this  Warrant  shall
thereafter  represent the right to acquire such number and kind of securities as
would  have been  issuable  as the  result of such  change  with  respect to the
securities  which  were  subject  to the  purchase  rights  under  this  Warrant
immediately  prior to such  reclassification  or other  change and the  exercise
price  therefor  shall  be  appropriately   adjusted,  all  subject  to  further
adjustment as provided in this Section 12.

                  (c)  SPLIT,  SUBDIVISION  OR  COMBINATION  OF  SHARES.  If the
Company  at any  time  while  this  Warrant,  or any  portion  thereof,  remains
outstanding and unexpired shall split, subdivide or combine the securities as to
which  purchase  rights under this  Warrant  exist,  into a different  number of
securities of the same class,  the exercise price for such  securities  shall be
proportionately   decreased   in  the  case  of  a  split  or   subdivision   or
proportionately increased in the case of a combination.

                  (d) ADJUSTMENTS FOR DIVIDENTS IN STOCK OR OTHER  SECURITIES OR
PROPERTY. If while this Warrant, or any portion thereof, remains outstanding and
unexpired the holders of the securities as to which  purchase  rights under this
Warrant exist at the time shall have  received,  or, on or after the record date
fixed for the determination of eligible stockholders, shall have become entitled
to  receive,  without  payment  therefor,  other  or  additional  stock or other
securities or property (other than cash) of the Company by way of dividend, then
and in each case, this Warrant shall represent the right to acquire, in addition
to the  number  of shares  of the  security  receivable  upon  exercise  of this
Warrant,  and without  payment of any  additional  consideration  therefor,  the
amount of such other or additional  stock or other securities or property (other
than  cash) of the  Company  which  such  holder  would hold on the date of such
exercise  had it been the  holder  of  record of the  security  receivable  upon
exercise  of this  Warrant  on the date  hereof and had  thereafter,  during the
period from the date hereof to and including the date of such exercise, retained
such shares  and/or all other  additional  stock  available  by it as  aforesaid
during such  period,  giving  effect to all  adjustments  called for during such
period by the provisions of this Section 12.

                  (e) CERTIFICATE AS TO ADJUSTMENTS. Upon the occurrence of each
adjustment  or  readjustment  pursuant  to this  Section  12, the Company at its
expense shall promptly  compute such  adjustment or  readjustment  in accordance
with the terms  hereof and furnish to each Holder a  certificate  setting  forth
such adjustment or readjustment  and showing in detail the facts upon which such
adjustment  or  readjustment  is based.  The  Company  shall,  upon the  written
request,  at any time,  of any such Holder,  furnish or cause to be furnished to
such  Holder  a  like  certificate  setting  forth:  (i)  such  adjustments  and
readjustments;  (ii) the  exercise  price at the time in  effect;  and (iii) the
number of shares and the  amount,  if any, of other  property  which at the time
would be received upon the exercise of the Warrant.

                  (f) NO  IMPAIRMENT.  The Company  will not,  by any  voluntary
action, avoid or seek to avoid the observance or performance of any of the terms
to be observed or performed

                                      -6-

<PAGE>

hereunder  by the  Company,  but will at all times in good  faith  assist in the
carrying out of all the  provisions  of this Section 12 and in the taking of all
such action as may be necessary or appropriate in order to protect the rights of
the Holders against impairment.

         13.      REGISTRATION RIGHTS.

         (a)  REGISTRATION  OF ALL  SHARES  UNDERLYING  WARRANT.  Subject to the
following provisions: As soon as practicable, the Company shall register 266,667
of the shares of Common Stock to be received for issuance  pursuant hereto;  and
if the  Guarantee is  Outstanding  on March 1, 2000, on or before March 15, 2000
the  Company  shall  amend such  registration,  or file a new  registration,  to
include the  remaining  233,333  shares of Common  Stock  reserved  for issuance
hereunder.

         (b)  PREPARTATION AND FILING:  If and  whenever the Company is under an
obligation  to effect the  registration  of any Common Stock  issuable  pursuant
hereto (the "Registrable Common Stock"),  the Company shall, as expeditiously as
practicable:

                           (i)   prepare   and  file  with  the   Commission   a
                  registration statement with respect to such securities and use
                  its best  efforts  to cause  such  registration  statement  to
                  become  and  remain   effective  in  accordance  with  Section
                  13(b)(ii);

                           (ii)  prepare  and  file  with  the  Commission  such
                  amendments and supplements to such registration statements and
                  the  prospectus  used  in  connection   therewith  as  may  be
                  necessary to keep such registration statement effective for at
                  least nine  months and to comply  with the  provisions  of the
                  Securities  Act with respect to the sale or other  disposition
                  of all Common Stock covered by such registration statement;

                           (iii)  furnish to each holder of  Registrable  Common
                  Stock such number of copies of a summary  prospectus  or other
                  prospectus,  including a preliminary prospectus, in conformity
                  with the  requirements  of the Securities  Act, and such other
                  documents  as such seller may  reasonably  request in order to
                  facilitate the public sale or other disposition of such Common
                  Stock;

                           (iv) use its best  efforts to register or qualify the
                  Common Stock covered by such registration  statement under the
                  securities  or "blue sky" laws of such  jurisdictions  as each
                  such seller shall reasonably request (PROVIDED,  HOWEVER, that
                  the  Company  shall not be  required  to  consent  to  general
                  service or process for all purposes in any jurisdiction  where
                  it is not then  qualified)  and do any and all  other  acts or
                  things  which may be  necessary  or  advisable  to enable such
                  seller to consummate  the public sale or other  disposition in
                  such jurisdiction of such securities;

                           (v) notify each seller of  Registrable  Common  Stock
                  covered  by such  registration  statement,  at any time when a
                  prospectus relating thereto covered by

                                      -7-

<PAGE>

                  such registration  statement is required to be delivered under
                  the Securities Act within the appropriate  period mentioned in
                  Section  13(c),  of the  happening of any event as a result of
                  which the prospectus included in such registration  statement,
                  as then in effect,  includes an untrue statement of a material
                  fact or omits to state a material  fact  required to be stated
                  therein  or  necessary  to make  the  statements  therein  not
                  misleading in the light of the circumstances then existing and
                  at the  request of such  seller,  prepare  and furnish to such
                  seller a reasonable  number of copies of a supplement to or an
                  amendment of such  prospectus  as may be necessary so that, as
                  thereafter  delivered to the  purchasers of such Common Stock,
                  such  prospectus  shall not include an untrue  statement  of a
                  material  fact or omit to state a material fact required to be
                  stated therein or necessary to make the statements therein not
                  misleading in the light of the  circumstances  then  existing;
                  and

                           (vi) furnish, at the request of any holder or holders
                  requesting  registration  of  Common  Stock  pursuant  to this
                  Section 13, on the date that such Registrable Common Stock are
                  delivered to the  underwriters  for sale in connection  with a
                  registration  described in this Section 13, if such securities
                  are being sold through  underwriters,  or, if such  securities
                  are not being sold through underwriters,  on the date that the
                  registration statement with respect to such securities becomes
                  effective,  (A) an  opinion,  dated such date,  of the counsel
                  representing   the   Company   for   the   purposes   of  such
                  registration, in form and substance as is customarily given to
                  underwriters in an underwritten public offering,  addressed to
                  the underwriters,  if any, and to the holder or holders making
                  such  request;  and (B) a letter  dated  such  date,  from the
                  independent certified public accountants to underwriters in an
                  underwritten  public offering,  addressed to the underwriters,
                  if any, and to the holder or holders making such request.

         (c)      EXPENSES.  The Company shall bear all costs and expenses of
                  each such registration, including, but not limited to,
                  printing, legal and accounting fees and expenses, Securities
                  and Exchange Commission and NASD filing fees and "Blue Sky"
                  fees and expenses;  provided, however, that the Company shall
                  have no obligation to pay or otherwise bear any portion of the
                  underwriters' commissions or discounts attributable to the
                  Common Stock being offered and sold by the holders of Common
                  Stock (if any), or the fees and expenses of any counsel for
                  the selling holders of Common Stock in connection with the
                  registration of the Membership Interests.

         (d)      ADDITIONAL COVENANTS CONCERNING SALES.

                           (i) If permitted by  applicable  law and  regulation,
                  the  Company,  at the  request  of the  holder of  Registrable
                  Common Stock, shall file such amendments and/or supplements to
                  such registration statement necessary to take such other steps
                  as may be required to maintain such registration  statement in
                  effect, and to keep the information  therein current,  so long
                  as any of the Registrable Common Stock included therein remain
                  unsold. In connection with any registration statement

                                      -8-

<PAGE>

                  referred to in this Section 13, the Company  shall  furnish to
                  the holder of  Registrable  Common  Stock (or to any broker or
                  other person at its request) a reasonable  number of copies of
                  such  registration  statement,  each  amendment and supplement
                  thereto and each document included therein, and such number of
                  copies of the then  current  prospectus  included  therein  as
                  either the holder of Common Stock or its brokers may from time
                  to time reasonably request.

                           (ii) In connection  with any  registration  statement
                  referred to in this Section 13 of this  Agreement,  the holder
                  of Registrable  Common Stock being  registered will furnish to
                  the Company  such  information  as the Company may  reasonably
                  require  from such holder for  inclusion  in the  registration
                  statement (and the prospectus included therein).

                           (iv) The Company's  obligations under this Section 13
                  shall be conditioned  upon each holder of  Registrable  Common
                  Stock  whose  Common  Stock  are  being   registered  and  any
                  underwriter  participating  in such public offering  executing
                  and  delivering to the Company an  appropriate  agreement,  if
                  necessary in the reasonable opinion of counsel to the Company,
                  in form satisfactory to counsel for the Company,  that he will
                  comply with all anti-stabilization,  manipulation, and similar
                  provisions  of Section 10 of the  Securities  Exchange  Act of
                  1934, as amended,  and any rules  promulgated  thereunder  and
                  will  furnish to the Company  information  about sales made in
                  such public offering.

         (e)      BLUE SKY PROVISIONS.  The Company, at its expense, shall cause
                  all of the Common Stock included in a  registration  statement
                  referred to in this Section 13 to be qualified  under the laws
                  of such reasonable  number of  jurisdictions  as the holder of
                  Registrable  Common Stock, or the managing  underwriter  named
                  therein,  may  designate,  and the Company will  continue such
                  qualification  in effect so long as may be necessary to comply
                  with all applicable laws regulating sales of securities.

         (f)      ADVISING THE HOLDER OF REGISTRABLE  MEMBERSHIP  INTERESTS.  In
                  connection with any registration statement referred to in this
                  Section 13, the Company  will  promptly  advise each holder of
                  Registrable  Common  Stock and confirm  such advice in writing
                  (i) when the registration statement has become effective, (ii)
                  when  any   post-effective   amendment  to  the   registration
                  statement becomes  effective,  and (iii) of any request by the
                  SEC  for  any  amendment  or  supplement  to the  registration
                  statement or prospectus or for additional information.

                  If at any  time  the  SEC  should  institute  or  threaten  to
                  institute  any  proceeding  for the  purposes of  issuing,  or
                  should issue, a stop order suspending the effectiveness of the
                  registration  statement,  the Company will promptly notify the
                  holder  of  Registrable  Common  Stock,  and will use its best
                  efforts to prevent  the  issuance of any such stop order or to
                  obtain the  withdrawal  thereof as soon as  possible;  and the
                  Company  will advise such holder of  Registrable  Common Stock
                  promptly of any order or  communication of any public board or
                  body addressed to the Company

                                      -9-

<PAGE>

                  suspending or threatening to suspend the qualification of any
                  Registrable Common Stock for sale in any jurisdiction.

         (g)      INDEMNIFICATION.

                           (i) With respect to the registration rights described
                  in this Section 13, the Company  hereby  agrees to  indemnify,
                  hold  harmless  and defend each holder of  Registrable  Common
                  Stock and each  person,  if any,  who is deemed a  controlling
                  person of such holder of  Registrable  Common Stock within the
                  meaning of the  Securities  Act,  against  any and all losses,
                  claims,  damages  or  liabilities  (including  legal and other
                  expenses  incurred in investigating  and defending against the
                  same), to which they, or any of them, may become subject under
                  the Securities Act or other statute or common law, arising out
                  of or based upon:

                                    (A)  any  alleged  untrue   statement  of  a
                                    material fact contained in any  registration
                                    statement,    preliminary    prospectus   or
                                    prospectus  included therein,  any amendment
                                    thereof of supplement thereto; or

                                    (B) the alleged  omission to state therein a
                                    material fact required to be stated  therein
                                    or   necessary   to  make   the   statements
                                    contained therein not misleading;  provided,
                                    however,  that the  indemnity  contained  in
                                    this  Subsection  (g) shall not apply to any
                                    such  alleged  untrue  statement or omission
                                    made in reliance upon and in conformity with
                                    information  furnished  in  writing  to  the
                                    Company  by or on  behalf  of the  Holder of
                                    Registrable  Common  Stock.  The  Holder  of
                                    Registrable Common Stock agrees that as soon
                                    as  practicable,  but  in any  event  within
                                    forty-five  (45) days,  after the receipt of
                                    notice of any claim or action  against it in
                                    respect  of which  indemnity  may be  sought
                                    from the  Company  hereunder,  to notify the
                                    Company thereof in writing,  and the Company
                                    shall  assume  the  defense of such claim or
                                    action (and the cost  thereof) by counsel of
                                    its own  choosing,  who shall be  reasonably
                                    satisfactory  to the  Holder of  Registrable
                                    Common Stock.

                           (ii) Each selling holder of Registrable  Common Stock
                  shall  agree  to  indemnify,  hold  harmless  and  defend  the
                  Company, its directors and officers,  and each person, if any,
                  who is deemed a  controlling  person of the  Company  with the
                  meaning of the  Securities  Act,  against  any and all losses,
                  claims,  damages  or  liabilities,  including  legal  or other
                  expenses  incurred in investigating  and defending against the
                  same,  to which they or any of them may become  subject  under
                  the Securities Act or other statute or common law, arising out
                  of or based upon:

                                    (A)  any  alleged  untrue   statement  of  a
                                    material   fact   contained   in  any   such
                                    registration  statement,  or  prospectus  or
                                    preliminary prospectus

                                      -10-

<PAGE>

                                    included therein, or any amendment thereof
                                    or supplement thereto, or

                                    (B) the alleged  omission to state therein a
                                    material fact required to be stated  therein
                                    or   necessary   to  make   the   statements
                                    contained   therein  not   misleading.   The
                                    Company,  and any other  person or entity in
                                    respect  of which  indemnity  may be  sought
                                    from the Holder of Common  Stock  hereunder,
                                    agree,  that as soon as practicable,  but in
                                    any event within forty-five (45) days, after
                                    receipt  of  notice  of any  claim or action
                                    against the Company or such other  person or
                                    entity, to notify the holder of Common Stock
                                    thereof in writing, and the holder of Common
                                    Stock  shall  assume the defense of any such
                                    claim or action  (and the cost  thereof)  by
                                    counsel of their own choosing,  who shall be
                                    reasonably satisfactory to the Company.

         14.    [RESERVED]

         15.    MISCELLANEOUS PROVISIONS.

                  (a)  GOVERNING   LAW.  This  Warrant  has  been  executed  and
delivered  in the State of New Jersey and shall be governed by and  construed in
accordance  with the laws of the State of New Jersey  without  reference  to the
principles of conflicts of law thereof

                  (b) JURISDICTION.  The Company hereby irrevocably consents and
submits to, and the Holder,  by its acceptance of this Warrant,  likewise hereby
irrevocably  consents and submits to, the exclusive  jurisdiction  of the United
States  District  Court for the  District of New Jersey in  connection  with any
proceeding  arising out of or relating to this Warrant,  waives any objection to
venue in such  District  (unless such court lacks  jurisdiction  with respect to
such proceeding, in which case, the Company irrevocably consents and submits to,
and the Holder, by its acceptance of this Warrant, likewise irrevocably consents
and  submits  to, the  jurisdiction  of the Courts of the State of New Jersey in
connection  with such  proceeding and waives any objection to venue in the State
of New Jersey),  and agrees that service of any  summons,  complaint,  notice or
other process relating to such proceeding may be effected in the manner provided
by Section 10(g) of the Rights Agreement.


                THE REST OF THIS PAGE IS INTENTIONALLY LEFT BLANK

                                      -11-

<PAGE>


                  (c)  ATTORNEYS'  FEES.  If any  action  at law or in equity is
necessary  to enforce or interpret  the terms of this  Warrant,  the  prevailing
party shall be entitled to reasonable  attorneys' fees, costs and disbursements,
in addition to any other relief to which such party may be entitled.

                  IN WITNESS WHEREOF,  the Company has caused this Warrant to be
signed in its corporate name by a duly authorized  officer and to be dated as of
the day and year written below.

Dated as of August ___, 1999


Total No. of Shares: 500,000 (subject to vesting as set forth in Section 1
above)

                                                         DATAMETRICS CORPORATION


                                                By:      /s/ Daniel P. Ginns
                                                         -----------------------
                                                         Name: Daniel P. Ginns
                                                         Title: Chairman and CEO

                                      -12-


<PAGE>

                               NOTICE OF EXERCISE



To:      DATAMETRICS CORPORATION
         25B Hanover Road
         Suite 3305
         Florham Park, NJ 07932




         (1) The  undersigned  hereby  elects to purchase  __________  shares of
Common Stock of DATAMETRICS  CORPORATION,  pursuant to the terms of the attached
Warrant, and tenders herewith payment of the purchase price for such shares.

         (2) In exercising  this Warrant,  the  undersigned  hereby confirms and
acknowledges  that the shares of Common Stock are being acquired  solely for the
account of the  undersigned  and not as a nominee for any other  party,  and for
investment,  and that the undersigned will not offer,  sell or otherwise dispose
of any such shares of Common  Stock,  except under  circumstances  that will not
result in a violation of the United States  Securities  Act of 1933, as amended,
or any foreign or state securities laws.

         (3) Please issue a certificate or certificates representing said shares
of  Common  Stock in the name of the  undersigned  or in such  other  name as is
specified below:

         (4)  Please  issue a new  Warrant  for the  unexercised  portion of the
attached  Warrant  in the name of the  undersigned  or in such  other name as is
specified below:




- ------------------------------               -----------------------------------
Date:                                        Name:


                                      -13-




EITHER THIS WARRANT NOR ANY SHARES OF COMMON STOCK  ISSUABLE  UPON THE EXERCISE
OF THIS  WARRANT  HAVE BEEN  REGISTERED  UNDER THE  SECURITIES  ACT OF 1933,  AS
AMENDED,  AND THE RULES AND REGULATIONS  PROMULGATED  THEREUNDER (THE "ACT"), OR
APPLICABLE  STATE  SECURITIES  LAWS.  THIS WARRANT AND THE COMMON STOCK ISSUABLE
UPON EXERCISE OF THIS WARRANT MAY NOT BE OFFERED, SOLD, TRANSFERRED OR OTHERWISE
DISPOSED OF IN THE ABSENCE OF  REGISTRATION  UNDER THE ACT OR  APPLICABLE  STATE
SECURITIES LAWS UNLESS DATAMETRICS  CORPORATION (THE "COMPANY") HAS RECEIVED THE
WRITTEN   OPINION  OF  THE  COMPANY'S   COUNSEL  OR  OTHER  COUNSEL   REASONABLY
SATISFACTORY THE COMPANY THAT, AFTER  INVESTIGATION OF THE RELEVANT FACTS,  SUCH
COUNSEL IS OF THE OPINION THAT SUCH  TRANSACTION  DOES NOT REQUIRE  REGISTRATION
UNDER THE ACT OR APPLICABLE STATE SECURITIES LAWS.


Warrant No._______                                              1,000,000 Shares



                        WARRANT TO PURCHASE COMMON STOCK
                                       OF
                             DATAMETRICS CORPORATION

         VOID AFTER 5:00 P.M., EASTERN DAYLIGHT TIME, ON AUGUST 31, 2004


         This certifies that, for value received, Roy Doumani or his permissible
transferees,  designees, successors and assigns (collectively, the "Holder"), is
entitled,  subject to the terms set forth below,  to purchase  from  Datametrics
Corporation,  a Delaware  corporation  (the  "Company"),  SO MUCH OF ONE MILLION
(1,000,000)  SHARES OF THE COMPANY'S COMMON STOCK, PAR VALUE $.01 PER SHARE (THE
"COMMON  STOCK"),  AS ARE THEN  AVAILABLE  PURSUANT TO THE SCHEDULE SET FORTH IN
SECTION 1  HEREOF,  upon  surrender  hereof,  as  hereinafter  provided,  at the
exercise  price of $1.00 per share of Common Stock.  The number of, and exercise
price for,  such shares of Common  Stock are subject to  adjustment  as provided
herein.  This Warrant is being issued in connection with and in consideration of
the initial Holder's secured  guarantee  ("Guarantee") of the Company's  secured
revolving   line  of  credit  in  the  amount  of  $1,000,000   pursuant  to  an
Intercreditor  and  Reimbursement  Agreement  of even date  between  the initial
Holder  and  the  Company.   For  purposes  hereof,  the  phrase  "Guarantee  is
Outstanding"  shall  mean  that the  Guarantee  has  continuously  from the date
hereof,  and as of the date of such  determination,  (i) been in full  force and
effect;  (ii) been fully secured in accordance  with the terms of the agreements
between the Company and the initial Holder,  or the Company,  the initial Holder
and the Bank; and (iii) not been  breached,  released,  canceled,  terminated or
surrendered.

         1. VESTING OF WARRANTS.  This Warrant is exercisable immediately by the
Holder in whole or in part,  at any time and from time to time  during  the term
hereof,  with respect to 333,333  shares of Common  Stock.  This Warrant also is
exercisable at any time during the term hereof with

                                      -1-

<PAGE>

respect to  additional  shares of Common Stock  increasing  by 33,333  shares of
Common Stock per month,  commencing  on September 1, 1999 and  continuing on the
first day of each month until August 1, 2000.  Thereafter,  if the  Guarantee is
Outstanding  on March 1, 2000 and this Warrant is exercisable at any time during
the term for an  additional  266,667  shares  of  Common  Stock.  otwithstanding
anything  to the  contrary  herein  contained,  this  Warrant  shall be canceled
automatically  as to all  shares  of  Common  Stock  as to  which it is not then
exercisable at the moment that the Guarantee is not Outstanding.

         2. ESERCISE. This Warrant may be exercised by the Holder in whole or in
part from time to time  commencing  on the date  hereof  and  terminating  on or
before 5:00 p.m.,  New York time,  on August 31, 2004 (the  "WARRANT  EXPIRATION
Date"),  with respect to the shares of Common Stock from time to time  available
in accordance  with Section 1 hereof,  upon his tendering this Warrant (with the
Notice of Exercise  annexed  hereto duly completed and executed on behalf of the
Holder),  and payment in cash or by check  acceptable  to the  Company,  for the
purchase  price of the shares to be  purchased  at the office of the Company (or
such  other  office or agency of the  Company as it may  designate  by notice in
writing to the Holder at the address of the Holder appearing on the books of the
Company).  To the extent not exercised prior to the Warrant Expiration Date this
Warrant  shall become void and all rights  thereunder  and all rights in respect
thereof shall cease as of such time.

         3.  RIGHTS UPON  EXERCISE.  This  Warrant  shall be deemed to have been
exercised  immediately  prior  to the  close  of  business  on the  date  of its
surrender for exercise as provided in Section 2 hereof,  and the person entitled
to receive  the shares of Common  Stock  issuable  upon such  exercise  shall be
treated for all  purposes as the holder of record of such shares as of the close
of business on such date.  Unless  exercised in connection  with an underwritten
public  offering,  as promptly as  practicable  on or after such date and in any
event within seven (7) days  thereafter,  the Company at its expense shall issue
and deliver to the person or persons  entitled to receive the same a certificate
or  certificates  for the number of shares  issuable upon such exercise.  In the
event that this Warrant is  exercised  in part,  the Company at its expense will
execute and deliver a new  Warrant of like tenor  exercisable  for the number of
shares for which this Warrant may then be exercised. In the event of exercise at
the  time  of  an  underwritten  public  offering,   the  Company  will  provide
instructions   as  to  the   exercise  of  this  Warrant  and  the  issuance  of
certificates.

         4. NO  FRACTIONAL  SHARES  OR  SCRIP.  No  fractional  shares  or scrip
representing  fractional  shares  shall  be  issued  upon the  exercise  of this
Warrant.  In lieu of any fractional share to which the Holder would otherwise be
entitled,  the Company  shall make a cash payment  equal to the  exercise  price
multiplied by such fraction.

         5.  REPLACEMENT  OF  WARRANT.   Upon  receipt  of  evidence  reasonably
satisfactory to the Company, in its sole and absolute  discretion,  of the loss,
theft, destruction or mutilation of this Warrant and, in the case of loss, theft
or destruction,  upon delivery of an indemnity agreement reasonably satisfactory
in form  and  substance  to the  Company  or,  in the case of  mutilation,  upon
surrender and  cancellation  of this  Warrant,  the Company at its expense shall
execute and deliver,  in lieu of this  Warrant,  a new warrant of like tenor and
amount.

                                      -2-

<PAGE>

         6. RIGHTS OF STOCKHOLDERS.  The Holder shall not be entitled to vote or
receive  dividends  or be  deemed  the  holder  of  Common  Stock  or any  other
securities  of the  Company  that may at any time be  issuable  on the  exercise
hereof for any  purpose,  nor shall  anything  contained  herein be construed to
confer  upon the  Holder,  as such,  any of the rights of a  stockholder  of the
Company or any right to vote for the  election of  directors  or upon any matter
submitted to stockholders at any meeting thereof, or to give or withhold consent
to any corporate action (whether upon any  recapitalization,  issuance of stock,
reclassification  of stock,  consolidation,  merger or  otherwise) or to receive
notices of meetings, or to receive dividends or subscription rights or otherwise
until the  Warrant  shall have been  exercised  and the  shares of Common  Stock
purchasable upon the exercise hereof shall have been issued, as provided herein.

         7. COMPLIANCE WITH SECURITIES LAWS. (a) The Holder of this Warrant,  by
acceptance  hereof,  acknowledges  that the shares of Common  Stock to be issued
upon exercise  hereof are being acquired solely for the Holder's own account and
not as a nominee for any other party,  and for  investment,  and that the Holder
will not offer,  sell or  otherwise  dispose of any shares of Common Stock to be
issued upon exercise hereof,  except under circumstances that will not result in
a violation of the United States Securities Act of 1933, as amended (the "ACT"),
or any foreign or state  securities  laws.  Upon exercise of this  Warrant,  the
Holder  shall,  if  requested  by the  Company,  confirm in  writing,  in a form
satisfactory  to the Company,  that the shares of Common Stock so purchased  are
being acquired solely for the Holder's, own account and not as a nominee for any
other party, for investment, and not with a view toward distribution or resale.

                  (b) All shares of Common Stock issued upon exercise hereof may
be stamped or  imprinted  with the  following  legend (in addition to any legend
required by the Act and the  securities  laws of any state of the United States)
as determined by counsel for the Company:

         THESE  SHARES  HAVE  NOT  BEEN  REGISTERED   UNDER  THE  UNITED  STATES
         SECURITIES  ACT OF 1933,  AS  AMENDED,  AND THE RULES  AND  REGULATIONS
         PROMULGATED  THEREUNDER  (THE "ACT"),  OR APPLICABLE  STATE  SECURITIES
         LAWS, AND MAY NOT BE OFFERED,  SOLD,  TRANSFERRED OR OTHERWISE DISPOSED
         OF IN THE ABSENCE OF  REGISTRATION  UNDER THE ACT OR  APPLICABLE  STATE
         SECURITIES  LAWS UNLESS  DATAMETRICS  CORPORATION  (THE  "COMPANY") HAS
         RECEIVED THE WRITTEN OPINION OF THE COMPANY'S  COUNSEL OR OTHER COUNSEL
         REASONABLY SATISFACTORY TO THE COMPANY THAT, AFTER INVESTIGATION OF THE
         RELEVANT  FACTS,  SUCH COUNSEL IS OF THE OPINION THAT SUCH  TRANSACTION
         DOES  NOT  REQUIRE  REGISTRATION  UNDER  THE  ACT OR  APPLICABLE  STATE
         SECURITIES LAWS.

         8.  RESTRICTIONS ON TRANSFER OF UNDERLYING  COMMON STOCK. The Holder of
this  Warrant by  acceptance  hereof  agrees that the  transfer of the shares of
Common Stock issuable upon the exercise of all or any portion of this Warrant is
subject to the provisions of this Warrant, which include certain restrictions on
the transfer of such shares of Common Stock.

                                      -3-

<PAGE>

         9. RESERVATION OF COMMON STOCK. The Company hereby covenants and agrees
that during the term that this Warrant is exercisable,  the Company will reserve
from its authorized and unissued  shares of Common Stock a sufficient  number of
shares to provide  for the  issuance of Common  Stock upon the  exercise of this
Warrant  and,  from time to time,  will take all  steps  necessary  to amend its
Certificate of Incorporation to provide a sufficient reserve of shares of Common
Stock issuable upon exercise of the Warrant.  The Company further covenants that
all shares that may be issued upon the  exercise of rights  represented  by this
Warrant and payment of the exercise price, all as set forth herein, will be free
from all taxes,  liens and charges in respect of the issue  thereof  (other than
taxes in  respect  of any  transfer  occurring  contemporaneously  or  otherwise
specified  herein).  The Company  agrees that its issuance of this Warrant shall
constitute  full  authority  to its  officers  who are charged  with the duty of
executing stock certificates to execute and issue the necessary certificates for
shares of Common Stock upon the exercise of this Warrant.

         10.  NOTICES.  (a)  Whenever  the  exercise  price or  number of shares
purchasable  hereunder  shall be  adjusted  pursuant  to Section 12 hereof,  the
Company shall issue a  certificate  signed by its Secretary  setting  forth,  in
reasonable  detail,  the  event  requiring  the  adjustment,  the  amount of the
adjustment,  the method by which such adjustment was calculated and the exercise
price and number of shares  purchasable  hereunder  after giving  effect to such
adjustment,  and shall cause a copy of such  certificate  to be mailed (by first
class mail, postage prepaid to the Holder of this Warrant.

                  (b) In  case:  (i) the  Company  shall  take a  record  of the
holders of its Common Stock (or other stock or securities at the time receivable
upon the exercise of this Warrant) for the purpose of entitling  them to receive
any dividend or other  distribution,  or any right to subscribe  for or purchase
any  shares of stock of any class or any other  securities,  or to  receive  any
other  right;  or  (ii)  of  any  capital  reorganization  of the  Company,  any
reclassification  of the capital  stock of the  Company,  any  consolidation  or
merger of the Company with or into another  corporation,  or any sale,  lease or
conveyance of all or  substantially  all of the assets of the Company to another
person; or (iii) of any voluntary dissolution,  liquidation or winding-up of the
Company,  then,  and in each such  case,  the  Company  will mail or cause to be
mailed to the  Holder a notice  specifying,  as the case may be, (A) the date on
which a record is to be taken for the purpose of such dividend,  distribution or
right,  and stating the amount and character of such dividend,  distribution  or
right,  or  (B)  the  date  on  which  such  reorganization,   reclassification,
consolidation,  merger, conveyance, dissolution, liquidation or winding-up is to
take  place,  and the time,  if any is to be fixed,  as of which the  holders of
record of Common Stock (or such stock or securities at the time  receivable upon
the  exercise of this  Warrant)  shall be entitled to exchange  their  shares of
Common  Stock  (or such  other  stock or  securities)  for  securities  or other
property deliverable upon such reorganization, reclassification,  consolidation,
merger, conveyance, dissolution, liquidation or winding-up. Such notice shall be
mailed at least ten (10) days prior to the date therein specified.

                  (c) All such  notices  and  communications  shall be deemed to
have been  received  (i) in the case of personal  delivery,  on the date of such
delivery and (ii) in the case of mailing,  on the second  business day following
the date of such mailing.

                                      -4-

<PAGE>

         11.  AMENDMENTS.  (a) Any term of this  Warrant may be amended with the
written  consent of the Company and the holders of warrants  which, if exercised
would  then  represent  not less than a majority  of the shares of Common  Stock
issuable upon exercise of any and all outstanding  warrants for shares of Common
Stock  issued by the Company on the date hereof (the "COMMON  STOCK  WARRANTS"),
even  without the  specific  consent of the  Holder.  An  amendment  effected in
accordance  with this Section 11 shall be binding upon each holder of any of the
Common Stock Warrants, each future holder of all such Common Stock Warrants, and
the Company.  The Company  shall  promptly  give notice to all holders of Common
Stock Warrants of any amendment effected in accordance with this Section 11.

                  (b) No  waivers of or  exceptions  to any term,  condition  or
provision of this Warrant, in any one or more instances,  shall be deemed to be,
or construed as, a further or continuing  waiver of any such term,  condition or
provision.

         12.  ADJUSTMENTS;  ANTIDILUTION.  The exercise prices and the number of
shares  purchasable  hereunder  are subject to  adjustment  from time to time as
follows:

                  (a) MERGER,  SALE OF ASSETS,  ETC. If at any time,  while this
Warrant, or any portion thereof, is outstanding and unexpired there shall be (i)
a  reorganization  (other  than  a  combination,  reclassification  exchange  or
subdivision  of  shares  otherwise  provided  for  herein),  (ii)  a  merger  or
consolidation  of the  Company  with or into  another  corporation  in which the
Company is not the surviving person, or a reverse triangular merger in which the
Company is the surviving  person but the shares of the  Company's  capital stock
outstanding  immediately  prior to the  merger  are  converted  by virtue of the
merger  into  other  property,  whether  in the  form  of  cash,  securities  or
otherwise,  or (iii) a sale or transfer of the Company's  properties  and assets
as, or  substantially  as, an entirety to any other  person,  then, as a part of
such reorganization,  merger, consolidation,  sale or transfer, lawful provision
shall be made so that the Holder  shall  thereafter  be entitled to receive upon
exercise of this Warrant, during the period specified herein and upon payment of
the  exercise  price  then in  effect,  the  number  of shares of stock or other
securities  or  property  of  the  successor  corporation  resulting  from  such
reorganization,  merger,  consolidation,  sale or transfer which a holder of the
shares  deliverable  upon  exercise of this Warrant  would have been entitled to
receive in such reorganization,  consolidation, merger, sale or transfer if this
Warrant  had been  exercised  immediately  before such  reorganization,  merger,
consolidation,  sale or transfer,  all subject to further adjustment as provided
in this  Section  12. The  foregoing  provisions  of this  subsection  (a) shall
similarly apply to successive  reorganizations,  consolidations,  mergers, sales
and transfers and to the stock or securities of any other  corporation which are
at the time  receivable  upon the  exercise  of this  Warrant.  If the per share
consideration  payable  to the Holder  for  shares in  connection  with any such
transaction  is in a form other  than cash or  marketable  securities,  then the
value of such  consideration  shall be determined in good faith by the Company's
Board of  Directors,  whose  determination  shall be final and  binding.  In all
events,  appropriate  adjustment  (as  determined in good faith by the Company's
Board of Directors)  shall be made in the  application of the provisions of this
Warrant  with  respect  to the  rights and  interests  of the  Holder  after the
transaction,  to the end that the provisions of this Warrant shall be applicable
after that event,  as nearly as reasonably  may be, in relation to any shares or
other property deliverable after that event upon exercise of this Warrant.

                                      -5-

<PAGE>

                  (b)  RECLASSIFICATION,  ETC.  If the Company at any time while
this Warrant,  or any portion thereof,  remains outstanding and unexpired shall,
by reclassification of securities or otherwise,  change any of the securities as
to which  purchase  rights under this Warrant exist into the same or a different
number  of  securities  of any  other  class  or  classes,  this  Warrant  shall
thereafter  represent the right to acquire such number and kind of securities as
would  have been  issuable  as the  result of such  change  with  respect to the
securities  which  were  subject  to the  purchase  rights  under  this  Warrant
immediately  prior to such  reclassification  or other  change and the  exercise
price  therefor  shall  be  appropriately   adjusted,  all  subject  to  further
adjustment as provided in this Section 12.

                  (c)  SPLIT,  SUBDIVISION  OF  COMBINATION  OF  SHARES.  If the
Company  at any  time  while  this  Warrant,  or any  portion  thereof,  remains
outstanding and unexpired shall split, subdivide or combine the securities as to
which  purchase  rights under this  Warrant  exist,  into a different  number of
securities of the same class,  the exercise price for such  securities  shall be
proportionately   decreased   in  the  case  of  a  split  or   subdivision   or
proportionately increased in the case of a combination.

                  (d) ADJUSTMENTS FOR DIVIDENDS IN STOCK OR OTHER  SECURITIES OR
PROPERTY. If while this Warrant, or any portion thereof, remains outstanding and
unexpired the holders of the securities as to which  purchase  rights under this
Warrant exist at the time shall have  received,  or, on or after the record date
fixed for the determination of eligible stockholders, shall have become entitled
to  receive,  without  payment  therefor,  other  or  additional  stock or other
securities or property (other than cash) of the Company by way of dividend, then
and in each case, this Warrant shall represent the right to acquire, in addition
to the  number  of shares  of the  security  receivable  upon  exercise  of this
Warrant,  and without  payment of any  additional  consideration  therefor,  the
amount of such other or additional  stock or other securities or property (other
than  cash) of the  Company  which  such  holder  would hold on the date of such
exercise  had it been the  holder  of  record of the  security  receivable  upon
exercise  of this  Warrant  on the date  hereof and had  thereafter,  during the
period from the date hereof to and including the date of such exercise, retained
such shares  and/or all other  additional  stock  available  by it as  aforesaid
during such  period,  giving  effect to all  adjustments  called for during such
period by the provisions of this Section 12.

                  (e) CERTIFICATE AS TO ADJUSTMENTS. Upon the occurrence of each
adjustment  or  readjustment  pursuant  to this  Section  12, the Company at its
expense shall promptly  compute such  adjustment or  readjustment  in accordance
with the terms  hereof and furnish to each Holder a  certificate  setting  forth
such adjustment or readjustment  and showing in detail the facts upon which such
adjustment  or  readjustment  is based.  The  Company  shall,  upon the  written
request,  at any time,  of any such Holder,  furnish or cause to be furnished to
such  Holder  a  like  certificate  setting  forth:  (i)  such  adjustments  and
readjustments;  (ii) the  exercise  price at the time in  effect;  and (iii) the
number of shares and the  amount,  if any, of other  property  which at the time
would be received upon the exercise of the Warrant.

                  (f) NO  IMPAIRMENT.  The Company  will not,  by any  voluntary
action, avoid or seek to avoid the observance or performance of any of the terms
to be observed or performed

                                      -6-

<PAGE>

hereunder  by the  Company,  but will at all times in good  faith  assist in the
carrying out of all the  provisions  of this Section 12 and in the taking of all
such action as may be necessary or appropriate in order to protect the rights of
the Holders against impairment.

         13.      REGISTRATION RIGHTS.

         (a)  REGISTRATION  OF ALL  SHARES  UNDERLYING  WARRANT.  Subject to the
following provisions: As soon as practicable, the Company shall register 533,333
of the shares of Common Stock to be received for issuance  pursuant hereto;  and
if the  Guarantee is  Outstanding  on March 1, 2000, on or before March 15, 2000
the  Company  shall  amend such  registration,  or file a new  registration,  to
include the  remaining  466,667  shares of Common  Stock  reserved  for issuance
hereunder.

         (b)  PREPARATION  AND FILING:  If and  whenever the Company is under an
obligation  to effect the  registration  of any Common Stock  issuable  pursuant
hereto (the "Registrable Common Stock"),  the Company shall, as expeditiously as
practicable:

                           (i)   prepare   and  file  with  the   Commission   a
                  registration statement with respect to such securities and use
                  its best  efforts  to cause  such  registration  statement  to
                  become  and  remain   effective  in  accordance  with  Section
                  13(b)(ii);

                           (ii)  prepare  and  file  with  the  Commission  such
                  amendments and supplements to such registration statements and
                  the  prospectus  used  in  connection   therewith  as  may  be
                  necessary to keep such registration statement effective for at
                  least nine  months and to comply  with the  provisions  of the
                  Securities  Act with respect to the sale or other  disposition
                  of all Common Stock covered by such registration statement;

                           (iii)  furnish to each holder of  Registrable  Common
                  Stock such number of copies of a summary  prospectus  or other
                  prospectus,  including a preliminary prospectus, in conformity
                  with the  requirements  of the Securities  Act, and such other
                  documents  as such seller may  reasonably  request in order to
                  facilitate the public sale or other disposition of such Common
                  Stock;

                           (iv) use its best  efforts to register or qualify the
                  Common Stock covered by such registration  statement under the
                  securities  or "blue sky" laws of such  jurisdictions  as each
                  such seller shall reasonably request (provided,  however, that
                  the  Company  shall not be  required  to  consent  to  general
                  service or process for all purposes in any jurisdiction  where
                  it is not then  qualified)  and do any and all  other  acts or
                  things  which may be  necessary  or  advisable  to enable such
                  seller to consummate  the public sale or other  disposition in
                  such jurisdiction of such securities;

                           (v) notify each seller of  Registrable  Common  Stock
                  covered  by such  registration  statement,  at any time when a
                  prospectus relating thereto covered by

                                      -7-

<PAGE>

                  such registration  statement is required to be delivered under
                  the Securities Act within the appropriate  period mentioned in
                  Section  13(c),  of the  happening of any event as a result of
                  which the prospectus included in such registration  statement,
                  as then in effect,  includes an untrue statement of a material
                  fact or omits to state a material  fact  required to be stated
                  therein  or  necessary  to make  the  statements  therein  not
                  misleading in the light of the circumstances then existing and
                  at the  request of such  seller,  prepare  and furnish to such
                  seller a reasonable  number of copies of a supplement to or an
                  amendment of such  prospectus  as may be necessary so that, as
                  thereafter  delivered to the  purchasers of such Common Stock,
                  such  prospectus  shall not include an untrue  statement  of a
                  material  fact or omit to state a material fact required to be
                  stated therein or necessary to make the statements therein not
                  misleading in the light of the  circumstances  then  existing;
                  and

                           (vi) furnish, at the request of any holder or holders
                  requesting  registration  of  Common  Stock  pursuant  to this
                  Section 13, on the date that such Registrable Common Stock are
                  delivered to the  underwriters  for sale in connection  with a
                  registration  described in this Section 13, if such securities
                  are being sold through  underwriters,  or, if such  securities
                  are not being sold through underwriters,  on the date that the
                  registration statement with respect to such securities becomes
                  effective,  (A) an  opinion,  dated such date,  of the counsel
                  representing   the   Company   for   the   purposes   of  such
                  registration, in form and substance as is customarily given to
                  underwriters in an underwritten public offering,  addressed to
                  the underwriters,  if any, and to the holder or holders making
                  such  request;  and (B) a letter  dated  such  date,  from the
                  independent certified public accountants to underwriters in an
                  underwritten  public offering,  addressed to the underwriters,
                  if any, and to the holder or holders making such request.

         (c)      EXPENSES.  The Company shall bear all costs and expenses of
                  each such registration, including, but not limited to,
                  printing, legal and accounting fees and expenses, Securities
                  and Exchange Commission and NASD filing fees and "Blue Sky"
                  fees and expenses;  provided, however, that the Company shall
                  have no obligation to pay or otherwise bear any portion of the
                  underwriters' commissions or discounts attributable to the
                  Common Stock being offered and sold by the holders of Common
                  Stock (if any), or the fees and expenses of any counsel for
                  the selling holders of Common Stock in connection with the
                  registration of the Membership Interests.

         (d)      ADDITIONAL COVENANTS CONCERNING SALES.

                           (i) If permitted by  applicable  law and  regulation,
                  the  Company,  at the  request  of the  holder of  Registrable
                  Common Stock, shall file such amendments and/or supplements to
                  such registration statement necessary to take such other steps
                  as may be required to maintain such registration  statement in
                  effect, and to keep the information  therein current,  so long
                  as any of the Registrable Common Stock included therein remain
                  unsold. In connection with any registration statement

                                      -8-

<PAGE>

                  referred to in this Section 13, the Company  shall  furnish to
                  the holder of  Registrable  Common  Stock (or to any broker or
                  other person at its request) a reasonable  number of copies of
                  such  registration  statement,  each  amendment and supplement
                  thereto and each document included therein, and such number of
                  copies of the then  current  prospectus  included  therein  as
                  either the holder of Common Stock or its brokers may from time
                  to time reasonably request.

                           (ii) In connection  with any  registration  statement
                  referred to in this Section 13 of this  Agreement,  the holder
                  of Registrable  Common Stock being  registered will furnish to
                  the Company  such  information  as the Company may  reasonably
                  require  from such holder for  inclusion  in the  registration
                  statement (and the prospectus included therein).

                           (iv) The Company's  obligations under this Section 13
                  shall be conditioned  upon each holder of  Registrable  Common
                  Stock  whose  Common  Stock  are  being   registered  and  any
                  underwriter  participating  in such public offering  executing
                  and  delivering to the Company an  appropriate  agreement,  if
                  necessary in the reasonable opinion of counsel to the Company,
                  in form satisfactory to counsel for the Company,  that he will
                  comply with all anti-stabilization,  manipulation, and similar
                  provisions  of Section 10 of the  Securities  Exchange  Act of
                  1934, as amended,  and any rules  promulgated  thereunder  and
                  will  furnish to the Company  information  about sales made in
                  such public offering.

         (e)      BLUE SKY PROVISIONS.  The Company, at its expense, shall cause
                  all of the Common Stock included in a  registration  statement
                  referred to in this Section 13 to be qualified  under the laws
                  of such reasonable  number of  jurisdictions  as the holder of
                  Registrable  Common Stock, or the managing  underwriter  named
                  therein,  may  designate,  and the Company will  continue such
                  qualification  in effect so long as may be necessary to comply
                  with all applicable laws regulating sales of securities.

         (f)      ADVISING THE HOLDER OF REGISTRABLE  MEMBERSHIP  INTERESTS.  In
                  connection with any registration statement referred to in this
                  Section 13, the Company  will  promptly  advise each holder of
                  Registrable  Common  Stock and confirm  such advice in writing
                  (i) when the registration statement has become effective, (ii)
                  when  any   post-effective   amendment  to  the   registration
                  statement becomes  effective,  and (iii) of any request by the
                  SEC  for  any  amendment  or  supplement  to the  registration
                  statement or prospectus or for additional information.

                  If at any  time  the  SEC  should  institute  or  threaten  to
                  institute  any  proceeding  for the  purposes of  issuing,  or
                  should issue, a stop order suspending the effectiveness of the
                  registration  statement,  the Company will promptly notify the
                  holder  of  Registrable  Common  Stock,  and will use its best
                  efforts to prevent  the  issuance of any such stop order or to
                  obtain the  withdrawal  thereof as soon as  possible;  and the
                  Company  will advise such holder of  Registrable  Common Stock
                  promptly of any order or  communication of any public board or
                  body addressed to the Company


                                      -9-

<PAGE>

                  suspending or threatening to suspend the qualification of any
                  Registrable Common Stock for sale in any jurisdiction.

         (g)      INDEMNIFICATION.

                           (i) With respect to the registration rights described
                  in this Section 13, the Company  hereby  agrees to  indemnify,
                  hold  harmless  and defend each holder of  Registrable  Common
                  Stock and each  person,  if any,  who is deemed a  controlling
                  person of such holder of  Registrable  Common Stock within the
                  meaning of the  Securities  Act,  against  any and all losses,
                  claims,  damages  or  liabilities  (including  legal and other
                  expenses  incurred in investigating  and defending against the
                  same), to which they, or any of them, may become subject under
                  the Securities Act or other statute or common law, arising out
                  of or based upon:

                                    (A)  any  alleged  untrue   statement  of  a
                                    material fact contained in any  registration
                                    statement,    preliminary    prospectus   or
                                    prospectus  included therein,  any amendment
                                    thereof of supplement thereto; or

                                    (B) the alleged  omission to state therein a
                                    material fact required to be stated  therein
                                    or   necessary   to  make   the   statements
                                    contained therein not misleading;  provided,
                                    however,  that the  indemnity  contained  in
                                    this  Subsection  (g) shall not apply to any
                                    such  alleged  untrue  statement or omission
                                    made in reliance upon and in conformity with
                                    information  furnished  in  writing  to  the
                                    Company  by or on  behalf  of the  Holder of
                                    Registrable  Common  Stock.  The  Holder  of
                                    Registrable Common Stock agrees that as soon
                                    as  practicable,  but  in any  event  within
                                    forty-five  (45) days,  after the receipt of
                                    notice of any claim or action  against it in
                                    respect  of which  indemnity  may be  sought
                                    from the  Company  hereunder,  to notify the
                                    Company thereof in writing,  and the Company
                                    shall  assume  the  defense of such claim or
                                    action (and the cost  thereof) by counsel of
                                    its own  choosing,  who shall be  reasonably
                                    satisfactory  to the  Holder of  Registrable
                                    Common Stock.

                           (ii) Each selling holder of Registrable  Common Stock
                  shall  agree  to  indemnify,  hold  harmless  and  defend  the
                  Company, its directors and officers,  and each person, if any,
                  who is deemed a  controlling  person of the  Company  with the
                  meaning of the  Securities  Act,  against  any and all losses,
                  claims,  damages  or  liabilities,  including  legal  or other
                  expenses  incurred in investigating  and defending against the
                  same,  to which they or any of them may become  subject  under
                  the Securities Act or other statute or common law, arising out
                  of or based upon:

                                    (A)  any  alleged  untrue   statement  of  a
                                    material   fact   contained   in  any   such
                                    registration  statement,  or  prospectus  or
                                    preliminary prospectus

                                      -10-

<PAGE>

                                    included therein, or any amendment thereof
                                    or supplement thereto, or

                                    (B) the alleged  omission to state therein a
                                    material fact required to be stated  therein
                                    or   necessary   to  make   the   statements
                                    contained   therein  not   misleading.   The
                                    Company,  and any other  person or entity in
                                    respect  of which  indemnity  may be  sought
                                    from the Holder of Common  Stock  hereunder,
                                    agree,  that as soon as practicable,  but in
                                    any event within forty-five (45) days, after
                                    receipt  of  notice  of any  claim or action
                                    against the Company or such other  person or
                                    entity, to notify the holder of Common Stock
                                    thereof in writing, and the holder of Common
                                    Stock  shall  assume the defense of any such
                                    claim or action  (and the cost  thereof)  by
                                    counsel of their own choosing,  who shall be
                                    reasonably satisfactory to the Company.

         14.    [RESERVED]

         15.    MISCELLANEOUS PROVISIONS.

                  (a)  GOVERNING   LAW.  This  Warrant  has  been  executed  and
delivered  in the State of New Jersey and shall be governed by and  construed in
accordance  with the laws of the State of New Jersey  without  reference  to the
principles of conflicts of law thereof

                  (b) JURISDICTION.  The Company hereby irrevocably consents and
submits to, and the Holder,  by its acceptance of this Warrant,  likewise hereby
irrevocably  consents and submits to, the exclusive  jurisdiction  of the United
States  District  Court for the  District of New Jersey in  connection  with any
proceeding  arising out of or relating to this Warrant,  waives any objection to
venue in such  District  (unless such court lacks  jurisdiction  with respect to
such proceeding, in which case, the Company irrevocably consents and submits to,
and the Holder, by its acceptance of this Warrant, likewise irrevocably consents
and  submits  to, the  jurisdiction  of the Courts of the State of New Jersey in
connection  with such  proceeding and waives any objection to venue in the State
of New Jersey),  and agrees that service of any  summons,  complaint,  notice or
other process relating to such proceeding may be effected in the manner provided
by Section 10(g) of the Rights Agreement.

                THE REST OF THIS PAGE IS INTENTIONALLY LEFT BLANK

                                      -11-

<PAGE>

                  (c)  ATTORNEYS'  FEES.  If any  action  at law or in equity is
necessary  to enforce or interpret  the terms of this  Warrant,  the  prevailing
party shall be entitled to reasonable  attorneys' fees, costs and disbursements,
in addition to any other relief to which such party may be entitled.

                  IN WITNESS WHEREOF,  the Company has caused this Warrant to be
signed in its corporate name by a duly authorized  officer and to be dated as of
the day and year written below.

Dated as of August ____, 1999

Total No. of  Shares:  1,000,000  (subject  to vesting as set forth in Section 1
above)

                                                     DATAMETRICS CORPORATION


                                                     By: /s/ Daniel P. Ginns
                                                         -----------------------
                                                         Name: Daniel P. Ginns
                                                         Title: Chairman and CEO

                                      -12-

<PAGE>

                               NOTICE OF EXERCISE



To:      DATAMETRICS CORPORATION
         25B Hanover Road
         Suite 3305
         Florham Park, NJ 07932




         (1) The  undersigned  hereby  elects to purchase  __________  shares of
Common Stock of DATAMETRICS  CORPORATION,  pursuant to the terms of the attached
Warrant, and tenders herewith payment of the purchase price for such shares.

         (2) In exercising  this Warrant,  the  undersigned  hereby confirms and
acknowledges  that the shares of Common Stock are being acquired  solely for the
account of the  undersigned  and not as a nominee for any other  party,  and for
investment,  and that the undersigned will not offer,  sell or otherwise dispose
of any such shares of Common  Stock,  except under  circumstances  that will not
result in a violation of the United States  Securities  Act of 1933, as amended,
or any foreign or state securities laws.

         (3) Please issue a certificate or certificates representing said shares
of  Common  Stock in the name of the  undersigned  or in such  other  name as is
specified below:

         (4)  Please  issue a new  Warrant  for the  unexercised  portion of the
attached  Warrant  in the name of the  undersigned  or in such  other name as is
specified below:




- ------------------------------              ------------------------------------
Date:                                       Name:

                                      -13-


NEITHER THIS WARRANT NOR ANY SHARES OF COMMON STOCK  ISSUABLE  UPON THE EXERCISE
OF THIS  WARRANT  HAVE BEEN  REGISTERED  UNDER THE  SECURITIES  ACT OF 1933,  AS
AMENDED,  AND THE RULES AND REGULATIONS  PROMULGATED  THEREUNDER (THE "ACT"), OR
APPLICABLE  STATE  SECURITIES  LAWS.  THIS WARRANT AND THE COMMON STOCK ISSUABLE
UPON EXERCISE OF THIS WARRANT MAY NOT BE OFFERED, SOLD, TRANSFERRED OR OTHERWISE
DISPOSED OF IN THE ABSENCE OF  REGISTRATION  UNDER THE ACT OR  APPLICABLE  STATE
SECURITIES LAWS UNLESS DATAMETRICS  CORPORATION (THE "COMPANY") HAS RECEIVED THE
WRITTEN   OPINION  OF  THE  COMPANY'S   COUNSEL  OR  OTHER  COUNSEL   REASONABLY
SATISFACTORY THE COMPANY THAT, AFTER  INVESTIGATION OF THE RELEVANT FACTS,  SUCH
COUNSEL IS OF THE OPINION THAT SUCH  TRANSACTION  DOES NOT REQUIRE  REGISTRATION
UNDER THE ACT OR APPLICABLE STATE SECURITIES LAWS.


No. _______



                        WARRANT TO PURCHASE COMMON STOCK

                             DATAMETRICS CORPORATION

             VOID AFTER 5:00 P.M., NEW YORK TIME ON AUGUST __, 2004


         This  certifies  that,  for  value  received,  MICHAEL  DOUMANI  or his
permissible transferees,  designees,  successors and assigns (collectively,  the
"HOLDER"),  is entitled,  subject to the terms set forth below, to purchase from
Datametrics Corporation,  a Delaware corporation (the "COMPANY"),  THE NUMBER OF
SHARES OF THE  COMPANY'S  COMMON  STOCK,  PAR VALUE $.0l PER SHARE (THE  "COMMON
STOCK"),  AS SET FORTH IN ON THE SIGNATURE PAGE HEREOF upon surrender hereof, at
the  principal  office of the  Company  referred  to below,  with the  Notice of
Exercise  attached hereto duly executed,  and  simultaneous  payment therefor in
lawful money of the United States, or otherwise as hereinafter  provided, at the
exercise  price as set forth in Section 2 hereof.  The  number of, and  exercise
price for,  such shares of Common  Stock are subject to  adjustment  as provided
herein.  This  Warrant is issued in  connection  with an  agreement  between the
Company and Branch  Banking and Trust Company for a revolving  line of credit in
the amount of $1,500,000.

         1. TERM OF  WARRANT.  Subject  to the terms  and  conditions  set forth
herein, this Warrant shall be exercisable,  in whole or in part, during the term
commencing on the date hereof (the "WARRANT  ISSUE DATE" and  terminating  on or
before 5:00 p.m.,  New York time,  on August __, 2004 (the  "WARRANT  EXPIRATION
DATE").  Outstanding Warrants not exercised prior to the Warrant Expiration Date
shall become void and all rights  thereunder  and all rights in respect  thereof
shall cease as of such time.

                                      -1-

<PAGE>

         2.  EXERCISE  PRICE.  The  exercise  price  shall be $1.10 per share of
Common Stock (the "WARRANT EXERCISE PRICE").

         3. EXERCISE OF WARRANT.  (a) This Warrant is exercisable by the Holder,
in whole or in part, at any time,  or from time to time,  during the term hereof
as described in Section 1 hereof,  by the surrender of this  Certificate and the
Notice of Exercise  annexed  hereto duly completed and executed on behalf of the
Holder,  at the office of the  Company  (or such  other  office or agency of the
Company as it may designate by notice in writing to the Holder at the address of
the Holder  appearing on the books of the  Company),  upon payment in cash or by
check  acceptable  to the Company,  for the  purchase  price of the shares to be
purchased.  Upon payment in full of all Notes,  this  Warrant  shall be canceled
automatically  as to all  shares  of  Common  Stock  as to  which it is not then
exercisable.

                  (b)  This  Warrant  shall be  deemed  to have  been  exercised
immediately  prior to the close of  business  on the date of its  surrender  for
exercise as provided in Section 3 (a) hereof, and the person entitled to receive
the shares of Common Stock  issuable upon such exercise shall be treated for all
purposes  as the holder of record of such  shares as of the close of business on
such date. Unless exercised in connection with an underwritten  public offering,
as promptly  as  practicable  on or after such date and in any event  within ten
(10) days thereafter,  the Company at its expense shall issue and deliver to the
person or persons entitled to receive the same a certificate or certificates for
the number of shares issuable upon such exercise. In the event that this Warrant
is exercised in part,  the Company at its expense will execute and deliver a new
Warrant  of like  tenor  exercisable  for the  number of shares  for which  this
Warrant  may  then be  exercised.  In the  event of  exercise  at the time of an
underwritten  public offering,  the Company will provide  instructions as to the
exercise of this Warrant and the issuance of certificates.

         4. NO  FRACTIONAL  SHARES  OR  SCRIP.  No  fractional  shares  or scrip
representing  fractional  shares  shall  be  issued  upon the  exercise  of this
Warrant.  In lieu of any fractional share to which the Holder would otherwise be
entitled,  the Company  shall make a cash payment  equal to the  exercise  price
multiplied by such fraction.

         5.  REPLACEMENT  OF  WARRANT.   Upon  receipt  of  evidence  reasonably
satisfactory to the Company, in its sole and absolute  discretion,  of the loss,
theft, destruction or mutilation of this Warrant and, in the case of loss, theft
or destruction,  upon delivery of an indemnity agreement reasonably satisfactory
in form  and  substance  to the  Company  or,  in the case of  mutilation,  upon
surrender and  cancellation  of this  Warrant,  the Company at its expense shall
execute and deliver,  in lieu of this  Warrant,  a new warrant of like tenor and
amount.

         6. RIGHTS OF STOCKHOLDERS.  The Holder shall not be entitled to vote or
receive  dividends  or be  deemed  the  holder  of  Common  Stock  or any  other
securities  of the  Company  that may at any time be  issuable  on the  exercise
hereof for any  purpose,  nor shall  anything  contained  herein be construed to
confer  upon the  Holder,  as such,  any of the rights of a  stockholder  of the
Company or any right to vote for the  election of  directors  or upon any matter
submitted to stockholders at any meeting thereof, or to give or withhold consent
to any corporate action (whether upon any  recapitalization,  issuance of stock,
reclassification  of stock,  consolidation,  merger or  otherwise) or to receive

                                      -2-

<PAGE>

notices of meetings, or to receive dividends or subscription rights or otherwise
until the  Warrant  shall have been  exercised  and the  shares of Common  Stock
purchasable upon the exercise hereof shall have been issued, as provided herein.

         7. COMPLIANCE WITH SECURITIES LAWS. (a) The Holder of this Warrant,  by
acceptance  hereof,  acknowledges  that the shares of Common  Stock to be issued
upon exercise  hereof are being acquired solely for the Holder's own account and
not as a nominee for any other party,  and for  investment,  and that the Holder
will not offer,  sell or  otherwise  dispose of any shares of Common Stock to be
issued upon exercise hereof,  except under circumstances that will not result in
a violation of the United States Securities Act of 1933, as amended (the "ACT"),
or any foreign or state  securities  laws.  Upon exercise of this  Warrant,  the
Holder  shall,  if  requested  by the  Company,  confirm in  writing,  in a form
satisfactory  to the Company,  that the shares of Common Stock so purchased  are
being acquired solely for the Holder's, own account and not as a nominee for any
other party, for investment, and not with a view toward distribution or resale.

                  (b) All shares of Common Stock issued upon exercise hereof may
be stamped or  imprinted  with the  following  legend (in addition to any legend
required by the Act and the  securities  laws of any state of the United States)
as determined by counsel for the Company:

         THESE  SHARES  HAVE  NOT  BEEN  REGISTERED   UNDER  THE  UNITED  STATES
         SECURITIES  ACT OF 1933,  AS  AMENDED,  AND THE RULES  AND  REGULATIONS
         PROMULGATED  THEREUNDER  (THE "ACT"),  OR APPLICABLE  STATE  SECURITIES
         LAWS, AND MAY NOT BE OFFERED,  SOLD,  TRANSFERRED OR OTHERWISE DISPOSED
         OF IN THE ABSENCE OF  REGISTRATION  UNDER THE ACT OR  APPLICABLE  STATE
         SECURITIES  LAWS UNLESS  DATAMETRICS  CORPORATION  (THE  "COMPANY") HAS
         RECEIVED THE WRITTEN OPINION OF THE COMPANY'S  COUNSEL OR OTHER COUNSEL
         REASONABLY SATISFACTORY TO THE COMPANY THAT, AFTER INVESTIGATION OF THE
         RELEVANT  FACTS,  SUCH COUNSEL IS OF THE OPINION THAT SUCH  TRANSACTION
         DOES  NOT  REQUIRE  REGISTRATION  UNDER  THE  ACT OR  APPLICABLE  STATE
         SECURITIES LAWS.

         8.  RESTRICTIONS ON TRANSFER OF UNDERLYING  COMMON STOCK. The Holder of
this  Warrant by  acceptance  hereof  agrees that the  transfer of the shares of
Common Stock issuable upon the exercise of all or any portion of this Warrant is
subject to the provisions of this Warrant, which include certain restrictions on
the transfer of such shares of Common Stock.

         9. RESERVATION OF COMMON STOCK. The Company hereby covenants and agrees
that during the term that this Warrant is exercisable,  the Company will reserve
from its authorized and unissued  shares of Common Stock a sufficient  number of
shares to provide  for the  issuance of Common  Stock upon the  exercise of this
Warrant  and,  from time to time,  will take all  steps  necessary  to amend its
Certificate of Incorporation to provide a sufficient reserve of shares of Common
Stock issuable upon exercise of the Warrant.  The Company further covenants that
all shares that may be issued upon the  exercise of rights  represented  by this
Warrant and payment of

                                      -3-

<PAGE>

the exercise price, all as set forth herein,  will be free from all taxes, liens
and charges in respect of the issue thereof  (other than taxes in respect of any
transfer occurring contemporaneously or otherwise specified herein). The Company
agrees that its issuance of this Warrant shall  constitute full authority to its
officers  who are  charged  with the duty of  executing  stock  certificates  to
execute and issue the necessary certificates for shares of Common Stock upon the
exercise of this Warrant.

         10.  NOTICES.  (a)  Whenever  the  exercise  price or  number of shares
purchasable  hereunder  shall be  adjusted  pursuant  to Section 12 hereof,  the
Company shall issue a  certificate  signed by its Secretary  setting  forth,  in
reasonable  detail,  the  event  requiring  the  adjustment,  the  amount of the
adjustment,  the method by which such adjustment was calculated and the exercise
price and number of shares  purchasable  hereunder  after giving  effect to such
adjustment,  and shall cause a copy of such  certificate  to be mailed (by first
class mail, postage prepaid to the Holder of this Warrant.

                  (b) In  case:  (i) the  Company  shall  take a  record  of the
holders of its Common Stock (or other stock or securities at the time receivable
upon the exercise of this Warrant) for the purpose of entitling  them to receive
any dividend or other  distribution,  or any right to subscribe  for or purchase
any  shares of stock of any class or any other  securities,  or to  receive  any
other  right;  or  (ii)  of  any  capital  reorganization  of the  Company,  any
reclassification  of the capital  stock of the  Company,  any  consolidation  or
merger of the Company with or into another  corporation,  or any sale,  lease or
conveyance of all or  substantially  all of the assets of the Company to another
person; or (iii) of any voluntary dissolution,  liquidation or winding-up of the
Company,  then,  and in each such  case,  the  Company  will mail or cause to be
mailed to the  Holder a notice  specifying,  as the case may be, (A) the date on
which a record is to be taken for the purpose of such dividend,  distribution or
right,  and stating the amount and character of such dividend,  distribution  or
right,  or  (B)  the  date  on  which  such  reorganization,   reclassification,
consolidation,  merger, conveyance, dissolution, liquidation or winding-up is to
take  place,  and the time,  if any is to be fixed,  as of which the  holders of
record of Common Stock (or such stock or securities at the time  receivable upon
the  exercise of this  Warrant)  shall be entitled to exchange  their  shares of
Common  Stock  (or such  other  stock or  securities)  for  securities  or other
property deliverable upon such reorganization, reclassification,  consolidation,
merger, conveyance, dissolution, liquidation or winding-up. Such notice shall be
mailed at least ten (10) days prior to the date therein specified.

                  (c) All such  notices  and  communications  shall be deemed to
have been  received  (i) in the case of personal  delivery,  on the date of such
delivery and (ii) in the case of mailing,  on the second  business day following
the date of such mailing.

         11.  AMENDMENTS.  (a) Any term of this  Warrant may be amended with the
written  consent of the Company and the holders of warrants  which, if exercised
would  then  represent  not less than a majority  of the shares of Common  Stock
issuable upon exercise of any and all outstanding  warrants for shares of Common
Stock  issued by the Company on the date hereof (the "COMMON  STOCK  WARRANTS"),
even  without the  specific  consent of the  Holder.  An  amendment  effected in
accordance  with this Section 11 shall be binding upon each holder of any of the
Common Stock Warrants, each future holder of all such Common Stock Warrants, and
the

                                   -4-

<PAGE>

Company.  The Company shall  promptly give notice to all holders of Common Stock
Warrants of any amendment effected in accordance with this Section 11.

                  (b) No  waivers of or  exceptions  to any term,  condition  or
provision of this Warrant, in any one or more instances,  shall be deemed to be,
or construed as, a further or continuing  waiver of any such term,  condition or
provision.

         12.  ADJUSTMENTS;  ANTIDILUTION.  The exercise prices and the number of
shares  purchasable  hereunder  are subject to  adjustment  from time to time as
follows:

                  (a) MERGER,  SALE OF ASSETS,  ETC. If at any time,  while this
Warrant, or any portion thereof, is outstanding and unexpired there shall be (i)
a  reorganization  (other  than  a  combination,  reclassification  exchange  or
subdivision  of  shares  otherwise  provided  for  herein),  (ii)  a  merger  or
consolidation  of the  Company  with or into  another  corporation  in which the
Company is not the surviving person, or a reverse triangular merger in which the
Company is the surviving  person but the shares of the  Company's  capital stock
outstanding  immediately  prior to the  merger  are  converted  by virtue of the
merger  into  other  property,  whether  in the  form  of  cash,  securities  or
otherwise,  or (iii) a sale or transfer of the Company's  properties  and assets
as, or  substantially  as, an entirety to any other  person,  then, as a part of
such reorganization,  merger, consolidation,  sale or transfer, lawful provision
shall be made so that the Holder  shall  thereafter  be entitled to receive upon
exercise of this Warrant, during the period specified herein and upon payment of
the  exercise  price  then in  effect,  the  number  of shares of stock or other
securities  or  property  of  the  successor  corporation  resulting  from  such
reorganization,  merger,  consolidation,  sale or transfer which a holder of the
shares  deliverable  upon  exercise of this Warrant  would have been entitled to
receive in such reorganization,  consolidation, merger, sale or transfer if this
Warrant  had been  exercised  immediately  before such  reorganization,  merger,
consolidation,  sale or transfer,  all subject to further adjustment as provided
in this  Section  12. The  foregoing  provisions  of this  subsection  (a) shall
similarly apply to successive  reorganizations,  consolidations,  mergers, sales
and transfers and to the stock or securities of any other  corporation which are
at the time  receivable  upon the  exercise  of this  Warrant.  If the per share
consideration  payable  to the Holder  for  shares in  connection  with any such
transaction  is in a form other  than cash or  marketable  securities,  then the
value of such  consideration  shall be determined in good faith by the Company's
Board of  Directors,  whose  determination  shall be final and  binding.  In all
events,  appropriate  adjustment  (as  determined in good faith by the Company's
Board of Directors)  shall be made in the  application of the provisions of this
Warrant  with  respect  to the  rights and  interests  of the  Holder  after the
transaction,  to the end that the provisions of this Warrant shall be applicable
after that event,  as nearly as reasonably  may be, in relation to any shares or
other property deliverable after that event upon exercise of this Warrant.

                  (b)  RECLASSIFICATION,  ETC.  If the Company at any time while
this Warrant,  or any portion thereof,  remains outstanding and unexpired shall,
by reclassification of securities or otherwise,  change any of the securities as
to which  purchase  rights under this Warrant exist into the same or a different
number  of  securities  of any  other  class  or  classes,  this  Warrant  shall
thereafter  represent the right to acquire such number and kind of securities as
would  have been  issuable  as the  result of such  change  with  respect to the
securities which were subject to the

                                      -5-

<PAGE>

purchase rights under this Warrant immediately prior to such reclassification or
other change and the exercise price therefor  shall be  appropriately  adjusted,
all subject to further adjustment as provided in this Section 12.

                  (c)  SPLIT,  SUBDIVISION  OR  COMBINATION  OF  SHARES.  If the
Company  at any  time  while  this  Warrant,  or any  portion  thereof,  remains
outstanding and unexpired shall split, subdivide or combine the securities as to
which  purchase  rights under this  Warrant  exist,  into a different  number of
securities of the same class,  the exercise price for such  securities  shall be
proportionately   decreased   in  the  case  of  a  split  or   subdivision   or
proportionately increased in the case of a combination.

                  (d) ADJUSTMENTS FOR DIVIDENDS IN STOCK OR OTHER  SECURITIES OR
PROPERTY. If while this Warrant, or any portion thereof, remains outstanding and
unexpired the holders of the securities as to which  purchase  rights under this
Warrant exist at the time shall have  received,  or, on or after the record date
fixed for the determination of eligible stockholders, shall have become entitled
to  receive,  without  payment  therefor,  other  or  additional  stock or other
securities or property (other than cash) of the Company by way of dividend, then
and in each case, this Warrant shall represent the right to acquire, in addition
to the  number  of shares  of the  security  receivable  upon  exercise  of this
Warrant,  and without  payment of any  additional  consideration  therefor,  the
amount of such other or additional  stock or other securities or property (other
than  cash) of the  Company  which  such  holder  would hold on the date of such
exercise  had it been the  holder  of  record of the  security  receivable  upon
exercise  of this  Warrant  on the date  hereof and had  thereafter,  during the
period from the date hereof to and including the date of such exercise, retained
such shares  and/or all other  additional  stock  available  by it as  aforesaid
during such  period,  giving  effect to all  adjustments  called for during such
period by the provisions of this Section 12.

                  (e) CERTIFICATE AS TO ADJUSTMENTS. Upon the occurrence of each
adjustment  or  readjustment  pursuant  to this  Section  12, the Company at its
expense shall promptly  compute such  adjustment or  readjustment  in accordance
with the terms  hereof and furnish to each Holder a  certificate  setting  forth
such adjustment or readjustment  and showing in detail the facts upon which such
adjustment  or  readjustment  is based.  The  Company  shall,  upon the  written
request,  at any time,  of any such Holder,  furnish or cause to be furnished to
such  Holder  a  like  certificate  setting  forth:  (i)  such  adjustments  and
readjustments;  (ii) the  exercise  price at the time in  effect;  and (iii) the
number of shares and the  amount,  if any, of other  property  which at the time
would be received upon the exercise of the Warrant.

                  (f) NO  IMPAIRMENT.  The Company  will not,  by any  voluntary
action, avoid or seek to avoid the observance or performance of any of the terms
to be observed or performed  hereunder by the Company,  but will at all times in
good faith assist in the carrying out of all the  provisions  of this Section 12
and in the taking of all such action as may be necessary or appropriate in order
to protect the rights of the Holders against impairment.

                                      -6-

<PAGE>

         13. REGISTRATION  RIGHTS. The Holder of this Warrant is not entitled to
any  registration  rights with respect to the shares of Common Stock  underlying
this Warrant, except as may be determined by the Company from time to time.

         14.  "CALL"  BY THE  COMPANY.  The  Warrants  are  subject  to call and
cancellation  by the  Company  at its  option at any time  prior to the  Warrant
Expiration Date if:

                  (a) the closing sale price of the Company's  Common Stock,  if
listed on the American Stock Exchange or some other national exchange, or if not
listed on a national  exchange,  then the  closing bid  quotation  of the Common
Stock as reported on NASDAQ, if listed thereon,  or if not, some other reporting
system that  provides  last sale prices,  shall have for a period of twenty (20)
consecutive days on which such market is open for trading (each a "TRADING DAY")
ending on the day prior to the date on which the  Company  gives the Call Notice
(as such term is  hereinafter  defined)  equaled or exceeded $2.00 (as equitably
adjusted to reflect the occurrence if any of the events  described in Section 12
hereof); and

                  (b) either:  (i) the  Company has on file with the  Securities
and  Exchange  Commission  (the  "COMMISSION")  a fully  effective  registration
statement  under the Act  covering  all  shares of Common  Stock  issuable  upon
exercise of the outstanding Common Stock Warrants,  or (ii) the shares of Common
Stock  issuable upon exercise of the  outstanding  Common Stock  Warrants may be
sold  without  any  restriction  pursuant  to the  rules  of the  Commission  as
determined by the counsel to the Company pursuant to a written opinion letter.

Notice of the Company's  exercise of its call (the "CALL NOTICE") shall be given
by the Company to the Holder in writing not less than twenty (20)  Trading  Days
before the date  fixed for call,  prior to which  fixed  date the  Holder  shall
maintain all of its rights hereunder. On and after the dated fixed for call, the
Holder shall have no rights with respect to outstanding  Warrants,  all of which
shall be canceled and, without more, shall be of no further force or effect.

         15.    MISCELLANEOUS PROVISIONS.

                  (a)  GOVERNING   LAW.  This  Warrant  has  been  executed  and
delivered  in the State of New York and shall be  governed by and  construed  in
accordance  with the laws of the  State of New  York  without  reference  to the
principles of conflicts of law thereof

                  (b) JURISDICTION.  The Company hereby irrevocably consents and
submits to, and the Holder,  by its acceptance of this Warrant,  likewise hereby
irrevocably  consents and submits to, the exclusive  jurisdiction  of the United
States  District  Court for the  District of New Jersey in  connection  with any
proceeding  arising out of or relating to this Warrant,  waives any objection to
venue in such  District  (unless such court lacks  jurisdiction  with respect to
such proceeding, in which case, the Company irrevocably consents and submits to,
and the Holder, by its acceptance of this Warrant, likewise irrevocably consents
and  submits  to, the  jurisdiction  of the Courts of the State of New Jersey in
connection  with such  proceeding and waives any objection to venue in the State
of New Jersey),  and agrees that service of any  summons,  complaint,  notice or
other process

                                      -7-

<PAGE>

relating to such  proceeding  may be effected in the manner  provided by Section
10(g) of the Rights Agreement.

                  (c)  ATTORNEYS'  FEES.  If any  action  at law or in equity is
necessary  to enforce or interpret  the terms of this  Warrant,  the  prevailing
party shall be entitled to reasonable  attorneys' fees, costs and disbursements,
in addition to any other relief to which such party may be entitled.

                  IN WITNESS WHEREOF,  the Company has caused this Warrant to be
signed in its corporate name by a duly authorized  officer and to be dated as of
the day and year written below.

Dated as of August ____, 1999

Total No. of Shares: 75,000
                    -------

                                                         DATAMETRICS CORPORATION


                                                    By:  /s/ Daniel P. Ginns
                                                         -----------------------
                                                         Name: Daniel P. Ginns
                                                         Title: Chairman and CEO

                                      -8-

<PAGE>

                               NOTICE OF EXERCISE



To:      DATAMETRICS CORPORATION
         25B Hanover Road
         Suite 3305
         Florham Park, NJ 07932




         (1) The  undersigned  hereby  elects to purchase  __________  shares of
Common Stock of DATAMETRICS  CORPORATION,  pursuant to the terms of the attached
Warrant, and tenders herewith payment of the purchase price for such shares.

         (2) In exercising  this Warrant,  the  undersigned  hereby confirms and
acknowledges  that the shares of Common Stock are being acquired  solely for the
account of the  undersigned  and not as a nominee for any other  party,  and for
investment,  and that the undersigned will not offer,  sell or otherwise dispose
of any such shares of Common  Stock,  except under  circumstances  that will not
result in a violation of the United States  Securities  Act of 1933, as amended,
or any foreign or state securities laws.

         (3) Please issue a certificate or certificates representing said shares
of  Common  Stock in the name of the  undersigned  or in such  other  name as is
specified below:

         (4)  Please  issue a new  Warrant  for the  unexercised  portion of the
attached  Warrant  in the name of the  undersigned  or in such  other name as is
specified below:




- ------------------------------            --------------------------------------
Date:                                     Name:

                                      -9-



                                      BB&T
                                 Loan Agreement



                                              ---------------------------------
                                                        Account Number


This Loan Agreement (the  "Agreement") is made this 20th day of August,  1999 by
and  between  BRANCH  BANKING  AND  TRUST  COMPANY,  a  North  Carolina  banking
corporation ("Bank"), and:

Datametrics Corporation,  a Delaware corporation ("Borrower"),  having executive
offices at Florham, New Jersey.

The Borrower has applied to Bank for and the Bank has agreed to make, subject to
the terms of this Agreement, the following loan(s):

LINE OF CREDIT ("Line of Credit") in the maximum  principal amount not to exceed
$1,500,000  at any one time  outstanding  for the  purpose of for the  temporary
expansion of current assets and to repay approximately $750,000 of 1996 Sub Debt
which shall be evidenced by the Borrower's  Promissory Note(s) dated on or after
the date hereof which shall mature  September  25, 2000,  when the entire unpaid
principal  balance then  outstanding plus accrued interest thereon shall be paid
in full.  Prior to maturity or the occurrence of any Event of Default  hereunder
and subject to any Borrowing Base limitations,  the Borrower may borrow,  repay,
and reborrow  hereunder through maturity.  Line of Credit shall bear interest at
the rate set forth in any such note evidencing all or any portion of the Line of
Credit,  the terms of which are incorporated  herein by reference,  and shall be
secured by .

SECTION 1 CONDITIONS PRECEDENT

The Bank  shall  not be  obligated  to make any  disbursement  until  all of the
following conditions have been satisfied by proper evidence,  execution,  and/or
delivery to the Bank of the following items in addition to this  Agreement,  all
in form and substance  satisfactory  to the Bank and the Bank's counsel in their
sole discretion:
NOTE(S): The Note(s)  evidencing the above referenced loans duly executed by the
     Borrower.
SECURITY AGREEMENT: A Security Agreement in which Borrower shall grant to Bank a
     first  and prior  security  interest  in the  Borrower's  or other  owner's
     specified  personal  property.  (If Bank will be a junior lienholder on any
     personal  property,  Borrower must fully disclose to Bank any and all prior
     security  interests,  and Bank must  specifically  approve  its junior lien
     position.)
UCC  FINANCING  STATEMENTS:  Acknowledged  copies  of UCC  Financing  Statements
     (UCC-1) duly filed in all jurisdictions necessary, or in the opinion of the
     Bank desirable,  to perfect the security  interests granted in the Security
     Agreement,  and  certified  copies of  Requests  For  Information  (UCC-11)
     identifying  all previous  financing  statements on record for the Borrower
     from all jurisdictions  indicating that no security interest has previously
     been granted in any of the collateral  described in the Security Agreement,
     unless prior approval has been given by the Bank.
COMMITMENT FEE: A commitment  fee (or balance  thereof) of $7,500.00  payable to
     the Bank on the date of execution of the Loan Documents,  unless a schedule
     follows:
CORPORATE  RESOLUTION:  A  Corporate  Resolution  duly  adopted  by the Board of
     Directors  of  the  Borrower  authorizing  the  execution,   delivery,  and
     performance of the Loan Documents on or in a form provided by or acceptable
     to Bank.
ARTICLES OF INCORPORATION: A copy of the Articles of Incorporation and all other
     charter  documents  of the  Borrower,  all filed with and  certified by the
     Secretary of State of the State of the Borrower's incorporation.
BY-LAWS:  A copy of the By-Laws of the Borrower,  certified by the Secretary of
     the Borrower as to their  completeness  and
     accuracy.
CERTIFICATE OF  INCUMBENCY:  A  certificate  of the  Secretary  of the  Borrower
     certifying  the names and true  signatures  of the officers of the Borrower
     authorized to sign the Loan Documents.
CERTIFICATE OF EXISTENCE: A certification of the Secretary of State of the State
     of the Borrower's Incorporation or Organization as to the existence or good
     standing of the Borrower and its charter documents on file.
OPINION OF COUNSEL:  An opinion of counsel for the Borrower  satisfactory to the
     Bank's counsel, that:
           i)   The representations and warranties of the Borrower in Section  2
                of the Agreement are true and correct in all material respects.
           ii)  The Loan Documents have been duly executed and delivered by the
                Borrower and Guarantor(s),  and constitute the legal, valid, and
                binding   obligations   of  the   Borrower   and   Guarantor(s),
                enforceable  against them in  accordance  with their  respective
                terms.
           iii) No registration  with,  consent of, approval of, or other action
                is  required  by  any  Federal,  State,  or  other  governmental
                authority or  regulatory  body for the execution and delivery of
                the Loan  Documents or, if so required,  such  registration  has
                been  made,   and  consent  or  approval  given  or  such  other
                appropriate action taken.
           iv) The loan transactions entered into pursuant to this Agreement are
                not usurious.
           v)   The Bank has a perfected  security  interest  and/or lien in the
                collateral  described in the Security  Agreement  and/or Deed of
                Trust.

Additional  Documents:  Receipt  by the Bank of other  approvals,  opinions,  or
     documents as the Bank may reasonably request.


                                       1
<PAGE>

                                      BB&T
                                 Loan Agreement


STANDBY LETTER(S) OF CREDIT:  The Bank shall be in receipt of Standby  Letter(s)
     of Credit in the amount of One Million  Five  Hundred  Thousand  and 00/100
     dollars  ($1,500,000),  which shall expire no sooner than 30 days after the
     maturity of the line of credit.
LIMITED RECOURSE  GUARANTY:  Receipt by the Bank of Limted Recourse  Guaranty of
     Roy Doumani and Carl Doumani.

SECTION 2 REPRESENTATIONS AND WARRANTIES

The Borrower and Guarantor(s) represent and warrant to Bank that:
     2.01.  FINANCIAL  STATEMENTS.  The balance  sheet of the  Borrower  and its
     subsidiaries and the related  Statements of Income and Retained Earnings of
     the Borrower and its subsidiaries, the accompanying footnotes together with
     the  accountant's  opinion  thereon,  and all other  financial  information
     previously  furnished to the Bank,  are true and correct and fairly reflect
     the  financial  condition of the Borrower  and its  subsidiaries  as of the
     dates thereof,  including all contingent liabilities of every type, and the
     financial  condition of the Borrower and its subsidiaries as stated therein
     has not changed  materially  and  adversely  since the date  thereof.  Each
     Guarantor  also  makes  the  same  representations  and  warranties  as the
     Borrower concerning its financial statements and condition.
     2.02.  CAPACITY AND  STANDING.  If the Borrower  and/or any  Guarantor is a
     corporation,  limited liability company, or limited liability  partnership,
     each warrants and represents that it is duly organized and validly existing
     under the laws of its respective state of incorporation or organization, it
     and its subsidiaries are duly qualified and in good standing in every other
     state  in  which  the  nature  of  their   business   shall   require  such
     qualification,  and are each duly  authorized  by their board of directors,
     managers or partners respectively to enter into and perform the obligations
     under the Loan Documents.
     2.03.  NO VIOLATION OF OTHER  AGREEMENTS.  The execution of any of the Loan
     Documents,  and  the  performance  by  the  Borrower,  the  Pledgor  or the
     Guarantors  thereunder  will not violate any  provision  of its articles of
     incorporation or by-laws,  articles of organization or operating agreement,
     or agreement of partnership or limited partnership, as applicable or of any
     law, other agreement, indenture, note, or other instrument binding upon the
     Borrower or  Guarantor,  or give cause for the  acceleration  of any of the
     respective obligations of the Borrower or Guarantor.
     2.04. AUTHORITY.  All authority from and approval by any federal, state, or
     local governmental body,  commission,  or agency,  necessary to the making,
     validity,  or  enforceability of this Agreement or the other Loan Documents
     has been obtained.
     2.05.  ASSET  OWNERSHIP.  The  Borrower and each  Guarantors  have good and
     marketable  title to all of the  properties  and  assets  reflected  on the
     balance sheets and financial statements furnished to the Bank, and all such
     properties  and  assets  are free and clear of  mortgages,  deeds of trust,
     pledges, liens, and all other encumbrances except as otherwise disclosed by
     such financial statements.
     2.06.  DISCHARGE OF LIENS AND TAXES. The Borrower,  its  subsidiaries,  and
     each  Guarantors  have filed,  paid,  and/or  discharged all taxes or other
     claims  which may become a lien on any of their  respective  properties  or
     assets,  excepting  to the extent  that such items are being  appropriately
     contested  in good faith and for which an adequate  reserve for the payment
     thereof is being maintained.
     2.07.  REGULATION  U. None of the proceeds of the loan(s) made  pursuant to
     this  Agreement  shall be used  directly or  indirectly  for the purpose of
     purchasing  or  carrying  any  margin  stock  in  violation  of  any of the
     provisions of Regulation U of the Board of Governors of the Federal Reserve
     System.
     2.08.  ERISA.  Each  employee  benefit  plan,  as defined  by the  Employee
     Retirement Income Security Act of 1974, as amended ("ERISA"), maintained by
     the Borrower or by any subsidiary of the Borrower or Guarantor(s) meets, as
     of the date hereof,  the minimum funding standards of Section 302 of ERISA,
     all applicable  requirements  of ERISA and of the Internal  Revenue Code of
     1986, as amended,  and no "Reportable  Event" nor "Prohibited  Transaction"
     (as defined by ERISA) has occurred with respect to any such plan.
     2.09.  LITIGATION.  There is no pending or threatened  action or proceeding
     against or affecting  the  Borrower,  any of its  subsidiaries,  except for
     legal  matters  disclosed in the  company's  financial  statements,  or the
     Guarantor(s) before any court,  commission,  governmental  agency,  whether
     State or Federal, or arbitration which may materially  adversely affect the
     financial condition,  operations,  properties, or business of the Borrower,
     any such subsidiary, or the Guarantor(s), or the ability of the Borrower or
     the Guarantor(s) to perform their obligations under the Loan Documents.
     2.10.  BINDING AND ENFORCEABLE.  The Loan Documents,  when executed,  shall
     constitute  valid and binding  obligations  of the Borrower and  Guarantors
     respectively and are enforceable in accordance with their terms,  except as
     may be limited  by  bankruptcy,  insolvency,  moratorium,  or similar  laws
     affecting creditors' rights generally.

SECTION 3 AFFIRMATIVE COVENANTS

The Borrower covenants and agrees that from the date hereof and until payment in
full of all  indebtedness  and  performance  of all  obligations  under the Loan
Documents, it will:
     3.01.  MAINTAIN  EXISTENCE.  Preserve and maintain its  existence  and good
     standing in the state of its organization, and qualify and remain qualified
     as a  foreign  corporation,  limited  partnership,  LLC,  or  LLP  in  each
     jurisdiction in which such qualification is required.
     3.02.  MAINTAIN  RECORDS.  Keep adequate  records and books of account,  in
     which complete  entries will be made in accordance with generally  accepted
     accounting  principles  consistently  applied,   reflecting  all  financial
     transactions of the Borrower.

                                       2
<PAGE>

     3.03.  MAINTAIN  PROPERTIES.  Maintain,  keep,  and  preserve  all  of  its
     properties (tangible and intangible)  necessary or useful in the conduct of
     its business in good working  order and  condition,  ordinary wear and tear
     excepted.
     3.04. CONDUCT OF BUSINESS. Continue to engage in an efficient, prudent, and
     economical manner in a business of the same general type as now conducted.
     3.05.  MAINTAIN  INSURANCE.  Maintain  insurance with financially sound and
     reputable  insurance companies or associations in such amounts and covering
     such risks as are  usually  carried by  companies  engaged in the same or a
     similar business,  and business interruption insurance if required by Bank,
     which  insurance may provide for reasonable  deductible.  The Bank shall be
     named as loss payee (Long Form) on all  policies  which apply to the Bank's
     collateral,  and the Borrower  shall deliver  certificates  of insurance at
     closing evidencing same. All such insurance policies shall provide, and the
     certificates shall state, that no policy will be terminated without 20 days
     prior written notice to Bank.
     3.06.  Comply With Laws.  Comply in all respects with all applicable  laws,
     rules, regulations, and orders including, without limitation, paying before
     the delinquency of all taxes, assessments, and governmental charges imposed
     upon it or upon its property, and all Environmental Laws.
     3.07. Right of Inspection. Permit the officers and authorized agents of the
     Bank, at any reasonable time in the Bank's sole discretion,  to examine and
     make copies of the records and books of account of, to visit the properties
     of the Borrower, and to discuss such matters with any officers,  directors,
     and the Borrower's independent accountant as the Bank deems necessary.

     3.08.  REPORTING  REQUIREMENTS.  Furnish  to the  Bank:
          MONTHLY FINANCIAL  STATEMENTS:  As soon as available and not more than
          twenty  (20)  days  after  the  end of  each  month,  balance  sheets,
          statements of income,  cash flow, and retained earnings for the period
          ended and a statement  of changes in the  financial  position,  all in
          reasonable   detail,   and  all  prepared  in  accordance   with  GAAP
          consistently  applied and certified as true and correct by an officer,
          general partner or manager of the Borrower.
          ANNUAL  FINANCIAL  STATEMENTS:  As soon as available and not more than
          ninety (90) days after the end of each fiscal  year,  balance  sheets,
          statements of income, and retained earnings for the period ended and a
          statement  of changes in the  financial  position,  all in  reasonable
          detail, and all prepared in accordance with GAAP consistently applied.
          The financial  statements must be of the following  quality or better:
          Audited.
          NOTICE OF  LITIGATION:  Promptly  after the receipt by the Borrower of
          notice or complaint of any action,  suit,  and  proceeding  before any
          court  or  governmental  agency  of  any  type  which,  if  determined
          adversely,  could  have a  material  adverse  effect on the  financial
          condition, properties, or operations of the Borrower.
          TAX  RETURNS:   As  soon  as  available  each  year,  complete  copies
          (including  all  schedules) of all state and federal tax returns filed
          by Borrower.
          OTHER INFORMATION: Such other information as the Bank may from time to
          time reasonably request.
     3.09. DEPOSIT ACCOUNTS.  Maintain  substantially all of its demand deposit/
     operating accounts with the Bank.


SECTION 4 FINANCIAL COVENANTS

The Borrower  covenants  and agrees that from the date hereof  until  payment in
full of all indebtedness  and the performance of all obligations  under the Loan
Documents,  the Borrower  shall at all times  maintain the  following  financial
covenants and ratios all in accordance with GAAP unless otherwise specified:

       TANGIBLE  NET  WORTH.  A  minimum  tangible  net  worth of not less  than
       $3,000,000.  Tangible Net Worth is defined as net worth, plus obligations
       contractually  subordinated  to  debts  owed  to  Bank,  minus  goodwill,
       contract  rights,  and  assets  representing  claims on  stockholders  or
       affiliated entities.

       DEBT TO WORTH. A ratio of total  liabilities to tangible net worth of not
       greater than 2.5 to 1.0.

       SHAREHOLDER  DEBT: All shareholder  debt shall be and shall remain at all
       times subordinate to debts owed to Bank.

SECTION 5 HAZARDOUS MATERIALS AND ENVIRONMENTAL COMPLIANCE

     5.01.  Investigation.  Borrower hereby  certifies that it has exercised due
     diligence  to  ascertain  whether  its  real  property,  including  without
     limitation the Mortgaged Property,  is or has been affected by the presence
     of asbestos, oil, petroleum or other hydrocarbons, urea formaldehyde, PCBs,
     hazardous  or nuclear  waste,  toxic  chemicals  and  substances,  or other
     hazardous materials  (collectively,  "Hazardous Materials"),  as defined in
     applicable  Environmental Laws. Borrower represents and warrants that there
     are no such Hazardous Materials  contaminating its real property,  nor have
     any such materials been released on or stored on or improperly  disposed of
     on its real property during its ownership,  occupancy or operation thereof.
     Borrower  hereby  agrees that it shall not  knowingly  permit any  release,
     storage or contamination as long as any indebtedness or obligations to Bank
     under the Loan  Documents  remains  unpaid  or  unfulfilled.  In  addition,
     Borrower does not have or use any underground storage tanks on its property
     which are not registered with the appropriate Federal and/or State agencies
     and which are not properly  equipped and maintained in accordance  with all
     Environmental  Laws. If requested by Bank, Borrower shall provide Bank with
     all  necessary  and   reasonable   assistance   required


                                       3
<PAGE>

                                      BB&T
                                 Loan Agreement


     for purposes of  determining  the  existence of Hazardous  Materials on the
     Mortgaged  Property,  including  allowing  Bank  access  to  the  Mortgaged
     Property,  and access to Borrower's  employees  having knowledge of, and to
     files and records  within  Borrower's  control  relating to the  existence,
     storage, or release of Hazardous Materials on the Mortgaged Property.

     5.02.   COMPLIANCE.   Borrower   agrees  to  comply  with  all   applicable
     Environmental Laws, rules and regulations,  including,  without limitation,
     all those  relating to  Hazardous  Materials.  Borrower  further  agrees to
     provide  Bank,  and all  appropriate  Federal and State  authorities,  with
     immediate  notice in writing of any release of  Hazardous  Materials on the
     Mortgaged  Property and to pursue  diligently to completion all appropriate
     and/or required remedial action in the event of such release.

     5.03.  REMEDIAL ACTION.  Bank shall have the right, but not the obligation,
     to  undertake  all or any part of such  remedial  action  in the event of a
     release of  Hazardous  Materials on the  Mortgaged  Property and to add any
     expenditures so made to the principal  indebtedness  secured by the Deed(s)
     of Trust.  Borrower agrees to indemnify and hold Bank harmless from any and
     all loss or liability arising out of any violation of the  representations,
     covenants,  and obligations  contained in this Section 6, or resulting from
     the recording of the Deed(s) of Trust.

SECTION 6 EVENTS OF DEFAULT

The following shall be Events of Default by Borrower or any Guarantor:

     6.01. The failure to make prompt payment of any installment of principal or
     interest on the Note(s) when due or payable.
     6.02. Any representation or warranty made in the Loan Documents which shall
     prove to be false or misleading in any material respect.
     6.03.  Any report,  certificate,  financial  statement,  or other  document
     furnished  prior  to the  execution  of or  pursuant  to the  terms of this
     Agreement shall prove to be false or misleading in any material respect.
     6.04. The Borrower or any Guarantor shall default on the performance of any
     other  obligation of  indebtedness  when due or in the  performance  of any
     obligation incurred in connection with money borrowed.
     6.05.  The breach of any  covenant,  condition,  or  agreement  made by the
     Borrower or any Guarantor under the Loan Documents.
     6.06. If a custodian  shall be appointed  for or take  possession of any or
     all of the assets of the Borrower or any Guarantor,  or should the Borrower
     or any Guarantor either voluntarily or involuntarily  become subject to any
     insolvency  proceeding,  any  proceeding  to dissolve  the  Borrower or any
     Guarantor,  any  proceeding  to have a  receiver  appointed,  or should the
     Borrower or any Guarantor  make an assignment for the benefit of creditors,
     or should there be an attachment,  execution,  or other judicial seizure of
     all or any portion of the Borrower's or any Guarantor's  assets,  including
     an action or  proceeding  to seize any funds on deposit with the Bank,  and
     such seizure is not discharged within 30 days.
     6.07. Final judgment for the payment of money shall be rendered against the
     Borrower  or any  Guarantor  which is not  covered by  insurance  and shall
     remain  undischarged  for a  period  of 30 days  unless  such  judgment  or
     execution thereon be effectively stayed.
     6.08.  Upon  the  death of a  Borrower  who is an  individual,  or upon the
     dissolution  or  termination of the existence of either the Borrower or any
     Guarantor.
     6.09. The Borrower or any Guarantor  shall become a Debtor (as such term is
     defined in the U.S. Bankruptcy Code), whether voluntarily or involuntarily.
     6.10.  Should the Bank in good faith deem  itself,  its liens and  security
     interests, if any, or any debt thereunder unsafe or insecure, or should the
     Bank  believe  in good faith  that the  prospect  of payment of any debt or
     other performance by the Borrower or any Guarantor is impaired.
     6.11.  Should  any lien or  security  interest  granted  to Bank to  secure
     payment of the Note(s) terminate,  fail for any reason to have the priority
     believed by Bank on the date granted,  or become unperfected or invalid for
     any reason.
     6.12. If any Guaranty  given in connection  with the Loan is terminated by,
     or upon the death of, any Guarantor.
     6.13.  Should the  Borrower,  any  Guarantor  or any  Pledgor  contest  the
     validity,  legality or enforceability of any Loan Document to which it is a
     party.

SECTION 7 REMEDIES UPON DEFAULT

Upon the  occurrence of any of the above listed Events of Default,  the Bank may
at any time thereafter, at its option, take any or all of the following actions,
at the same or at different times:
     7.01. Declare the balance of the Note(s) to be immediately due and payable,
     both as to principal and interest, without presentment, demand, protest, or
     notice of any kind, all of which are hereby  expressly  waived by Borrower,
     each  Guarantor,  and Pledgor,  such balance  shall accrue  interest at the
     Default Rate;
     7.02. Require the Borrower or Guarantor(s) to pledge additional  collateral
     to the Bank from the Borrower's or Guarantor's  assets and properties,  the
     acceptability  and  sufficiency of such  collateral to be determined in the
     Bank's sole discretion;
     7.03. Take immediate possession of and foreclose upon any or all collateral
     which may be  granted  to the Bank as  security  for the  indebtedness  and
     obligations of Borrower or any Guarantor under the Loan Documents;
     7.04. Exercise other rights and remedies as the Bank may be provided in the
     Loan Documents,  as a secured party under the Maryland  Uniform  Commercial
     Code, and as provided by law;
     7.05. Any obligation of the Bank to advance funds under the Note(s) and all
     other  obligations,  if any,  of the Bank  under the Loan  Documents  shall
     immediately  cease and terminate  unless and until Bank shall  reinstate in
     writing.


                                       4
<PAGE>

SECTION 8 MISCELLANEOUS PROVISIONS

     8.01.  DEFINITIONS.

        "DEFAULT  RATE" shall mean a rate of interest equal to Bank's Prime Rate
     plus five  percent  (5%) per annum (not to exceed the legal  maximum  rate)
     from and after the date of an Event of Default hereunder which shall apply,
     in the Bank's sole discretion,  to all sums owing,  including principal and
     interest, on such date.
        "ENVIRONMENTAL   LAWS"  shall  mean  all  federal  and  state  laws  and
     regulations  which affect or may affect the Mortgaged  Property,  including
     without limitation the Comprehensive Environmental Response,  Compensation,
     and  Liability  Act  (42  U.S.C.  Sections  9601  et  seq.),  the  Resource
     Conservation  and  Recovery  Act (42  U.S.C.  Sections  6901 et seq.),  the
     Federal Water Pollution Control Act (33 U.S.C.  Sections 1251 et seq.), the
     Clean  Air Act (42  U.S.C.  Section  7401 et seq.),  the  Toxic  Substances
     Control Act (15 U.S.C.  Section 2601 et seq.),  as such laws or regulations
     have been  amended  or may be  amended.
        "LOAN DOCUMENTS" shall mean this Agreement,  the Note(s), the Deed(s) of
     Trust,  the Security  Agreement(s),  Assignment(s) of Leases and Rents, all
     UCC-1  Financing  Statements,  the  Guaranty  Agreement(s),  and all  other
     documents,  certificates, and instruments executed in connection therewith,
     and   all   renewals,   extensions,   modifications,   substitutions,   and
     replacements  thereto and  therefore.
        "PERSON"  shall mean an  individual,  partnership,  corporation,  trust,
     unincorporated  organization,  limited liability company, limited liability
     partnership,   association,  joint  venture,  or  a  government  agency  or
     political subdivision thereof.
        "GAAP"  shall  mean   generally   accepted   accounting   principles  as
     established  by the Financial  Accounting  Standards  Board or the American
     Institute of Certified Public Accountants, as amended and supplemented from
     time to time.

"PRIME  RATE"  shall  mean the rate of  interest  per  annum
     announced  by the Bank from  time to time and  adopted  as its Prime  Rate,
     which is one of several  rate indexes  employed by the Bank when  extending
     credit,  and may not  necessarily be the Bank's lowest lending rate.
     8.02.  NON-IMPAIRMENT.  If any one or more provisions contained in the Loan
     Documents shall be held invalid,  illegal, or unenforceable in any respect,
     the validity,  legality,  and  enforceability  of the remaining  provisions
     contained  therein shall not in any way be affected or impaired thereby and
     shall otherwise remain in full force and effect.
     8.03.  APPLICABLE  LAW. The Loan Documents shall be construed in accordance
     with and governed by the laws of the state of Maryland.
     8.04.  WAIVER.  Neither the failure or any delay on the part of the Bank in
     exercising  any right,  power or  privilege  granted in the Loan  Documents
     shall operate as a waiver thereof, nor shall any single or partial exercise
     thereof preclude any other or further  exercise of any other right,  power,
     or privilege which may be provided by law.
     8.05. MODIFICATION. No modification,  amendment, or waiver of any provision
     of any of the Loan  Documents  shall be  effective  unless in  writing  and
     signed by the Borrower and Bank.
     8.06. PAYMENT AMOUNT  ADJUSTMENT.  In the event that any Loan(s) referenced
     herein  has a  variable  (floating)  interest  rate and the  interest  rate
     increases,  Bank,  at its  sole  discretion,  may at any  time  adjust  the
     Borrower's payment amount(s) to prevent the amount of interest accrued in a
     given period to exceed the periodic  payment amount or to cause the Loan(s)
     to be repaid within the same period of time as originally agreed upon.
     8.07.  STAMPS AND FEES. The Borrower shall pay all federal or state stamps,
     taxes, or other fees or charges, if any are payable or are determined to be
     payable  by reason of the  execution,  delivery,  or  issuance  of the Loan
     Documents  or any  security  granted  to the  Bank;  and the  Borrower  and
     Guarantor agree to indemnify and hold harmless the Bank against any and all
     liability  in  respect  thereof.
     8.08.  ATTORNEYS FEES. In the event the Borrower or Guarantor shall default
     in any of its  obligations  hereunder and the Bank believes it necessary to
     employ an  attorney  to  assist in the  enforcement  or  collection  of the
     indebtedness  of the  Borrower  to the  Bank,  to  enforce  the  terms  and
     provisions of the Loan  Documents to modify the Loan  Documents,  or in the
     event the Bank  voluntarily or otherwise  should become a party to any suit
     or legal proceeding  (including a proceeding conducted under the Bankruptcy
     Code), the Borrower and Guarantors  agree to pay the reasonable  attorney's
     fees of the Bank and all related costs of collection  or  enforcement  that
     may be incurred by the Bank. The Borrower and Guarantor shall be liable for
     such  attorney's  fees and  costs  whether  or not any  suit or  proceeding
     commences.
     8.09.  BANK MAKING REQUIRED  PAYMENTS.  In the event Borrower shall fail to
     maintain  insurance,  pay taxes or  assessments,  costs and expenses  which
     Borrower  is,  under  any of the  terms  hereof  or of any Loan  Documents,
     required  to  pay,  or  fail  to  keep  any of the  properties  and  assets
     constituting  collateral  free  from  new  security  interests,  liens,  or
     encumbrances,  except as permitted  herein,  Bank may at its election  make
     expenditures for any or all such purposes and the amounts expended together
     with interest thereon at the Default Rate, shall become immediately due and
     payable to Bank, and shall have benefit of and be secured by the collateral
     The Bank shall be under no duty or obligation  whatever with respect to any
     of the foregoing  expenditures.
     8.10. RIGHT OF OFFSET.  Any indebtedness owing from Bank to Borrower may be
     set off and applied by Bank on any indebtedness or liability of Borrower to
     Bank,  at any  time  and  from  time to time  after  maturity,  whether  by
     acceleration or otherwise,  and without demand or notice to Borrower.  Bank
     may sell participations in or make assignments of any loans made under this
     Agreement,  and Borrower agrees that any such participant or assignee shall
     have the same right of setoff as is granted to the Bank herein.
     8.11.  MODIFICATION  AND RENEWAL FEES. Bank may, at its option,  charge any
     fees for modification, renewal, extension, or amendment of any terms of the
     Note(s) permitted by applicable law and the Loan Documents.

                                       5
<PAGE>

     8.12.  CONFLICTING  PROVISIONS.  If  provisions  of  this  Agreement  shall
     conflict with any terms or provisions of the Note(s), the provisions of the
     Note(s) shall take priority over any provisions in the Agreement.
     8.13.  NOTICES.  Any notice permitted or required by the provisions of this
     Agreement  shall be deemed to have been given when  delivered in writing to
     the City  Executive  or any Vice  President  of the Bank at its  offices in
     Hyattsville,  Maryland,  and to the Chief Executive Officer of the Borrower
     at its  offices in  Florham,  New Jersey  when sent by  certified  mail and
     return receipt requested.
     8.14. CONSENT TO JURISDICTION.  Borrower hereby irrevocably agrees that any
     legal action or proceeding arising out of or relating to this Agreement may
     be instituted  in any Maryland  state court or federal court sitting in the
     state of  Maryland,  or in such other court and venue as Bank may choose as
     its sole discretion.  Borrower  consents to the jurisdiction of such courts
     and waives  any  objection  relating  to the basis for  personal  or in rem
     jurisdiction  or to venue which  Borrower may now or hereafter  have in any
     such legal action or proceedings.
     8.15.  COUNTERPARTS.  This Agreement may be executed by one or more parties
     on any number of separate  counterparts and all of such counterparts  taken
     together shall be deemed to constitute one and the same  instrument.
     8.16.  ENTIRE  AGREEMENT.  The Loan Documents  embody the entire  agreement
     between  Borrower and Bank with respect to the Loans, and there are no oral
     or parol agreements  existing between Bank and Borrower with respect to the
     Loans which are not expressly set forth in the Loan Documents.

                         [Signatures on Following Page]

                                       6
<PAGE>


                                 Signature Page

IN WITNESS WHEREOF,  the Borrower and Guarantor have caused this Agreement to be
duly executed all as of the date first above written.

                           BORROWER IS A CORPORATION:


                                         ---------------------------------------
                                                     Name of Corporation

Attest:                                  By:
           ----------------------        ---------------------------------------

Title:                                   Title:
           ----------------------        ---------------------------------------

                                         By:
                                         ---------------------------------------
           (Corporate Seal)
                                         Title:
                                         ---------------------------------------

                       ADDITIONAL CO-MAKERS OR GUARANTORS:
WITNESS:

                                                                          (SEAL)
- ---------------------------------            -----------------------------------

                                                                          (SEAL)
- ---------------------------------            -----------------------------------

                                                                          (SEAL)
- ---------------------------------            -----------------------------------

                                                                          (SEAL)
- ---------------------------------            -----------------------------------


                                          Branch Banking and Trust Company

Attest:                                 By:
       -----------------------------   -----------------------------------------

           (Corporate Seal)             Title:
                                       -----------------------------------------

                                       7
<PAGE>


                                      BB&T
                           Addendum to Loan Agreement


         THIS ADDENDUM amends and supplements the Loan Agreement dated , between
("Borrower"), BRANCH BANKING AND TRUST COMPANY ("Bank"), and certain Guarantors.

ADDITIONAL REPRESENTATIONS AND WARRANTIES - Year 2000 Ready:

         Borrower  represents and warrants to Bank that it has begun to evaluate
and to take all  necessary  and  appropriate  steps to insure that its  computer
operating   systems'   hardware  and  software   for   information   processing,
manufacturing,   communications,   building(s)  and  plant  facilities,  support
services,  and other  applications  (collectively  "Systems")  will be Year 2000
Ready on or prior to December 31, 1999. "Year 2000 Ready" means that all Systems
shall (i) accept input and provide  output of data  involving  dates or portions
thereof   correctly  and  without  ambiguity  as  to  the  twentieth  (20th)  or
twenty-first (21st) centuries;  (ii) manage, store, manipulate,  sort, sequence,
and perform  calculations  (collectively  "process") all data involving dates or
portions thereof before,  during and after January 1, 2000, without malfunction,
amends or aborts;  and (iii)  correctly  process leap years  (including the year
2000).

ADDITIONAL COVENANTS

         1. If requested by Bank, Borrower will assist in accurately  completing
the BB&T Year 2000 Client Questionnaire.

         2.  Borrower   shall   promptly   report  to  Bank  any  likelihood  or
circumstances  which may render  Borrower  unable to make its Systems  Year 2000
Ready by December 31, 1999,  and if requested by Bank,  Borrower  shall  furnish
periodic progress reports on its progress in becoming Year 2000 Ready.

         3. If Borrower determines at anytime that it may not be Year 2000 Ready
by December 31, 1999, or if the Bank believes that the Borrower will not be Year
2000 Ready by December 31, 1999, Bank may, at its sole discretion (i) conduct an
audit of Borrower to determine its Year 2000 Readiness, or (ii) require Borrower
to have a Year 2000 Ready audit  conducted by an independent  firm or consultant
satisfactory to Bank at Borrower's expense.


EVENT OF DEFAULT

         Borrower  shall be in default under this Loan  Agreement  should (i) it
determine  that it cannot be Year 2000 Ready by December  31,  1999,  or (ii) an
audit conducted by the Bank or by an independent firm or consultant reveals that
Borrower is not or cannot be Year 2000 Ready by December 31, 1999.

                           BORROWER IS A CORPORATION:


                                                   -----------------------------
                                                        Name of Corporation

Attest:                                                        By:
           ----------------------------            -----------------------------

Title:                                             Title:
           ---------------------------             -----------------------------

                                                   By:
                                                   -----------------------------
           (Corporate Seal)
                                                   Title:
                                                   -----------------------------

                       ADDITIONAL CO-MAKERS OR GUARANTORS:
WITNESS:

                                                                          (SEAL)
- -------------------------------------              -----------------------------

                                                                          (SEAL)
- -------------------------------------              -----------------------------

                                                                          (SEAL)
- -------------------------------------              -----------------------------

                                                                          (SEAL)
- ------------------------------------               -----------------------------


                        BRANCH BANKING AND TRUST COMPANY

Attest:                                             By:
       ------------------------------               ----------------------------

           (Corporate Seal)                         Title:
                                                    ----------------------------







Borrower:   DATAMETRICS CORPORATION, a Delaware corporation
Account Number: _______________                    Note Number: ________________
Address:_______________________     BB&T           ___________________, Maryland
        _______________________                    Date:         August 20, 1999

                                 PROMISSORY NOTE

THE UNDERSIGNED REPRESENTS THAT THE LOAN EVIDENCED HEREBY IS BEING OBTAINED FOR
BUSINESS/COMMERCIAL   OR  AGRICULTURAL   PURPOSES.   For  value  received,   the
undersigned,  jointly and severally if more than one,  promises to pay to BRANCH
BANKING AND TRUST COMPANY, a North Carolina banking corporation (the "Bank"), or
order,  at any of Bank's  offices  in the above  referenced  city (or such other
place or places that may be hereafter  designated by Bank), the principal amount
of ONE MILLION FIVE HUNDRED  THOUSAND * * *  Dollars  ($1,500,000.00) plus
accrued  interest  theron,  in  immediately available  coin or currency  of the
United  States of  America.  INTEREST  SHALL ACCRUE FROM THE DATE HEREOF ON THE
UNPAID  PRINCIPAL  BALANCE  OUTSTANDING  FROM TIME TO TIME AT THE:

|_|  Fixed rate of ___________________ % per annum.

|X|  Variable rate of the Bank's Prime Rate plus .5% per annum to be adjusted
     DAILY as the Bank's prime Rate changes.  If checked here |_| the interest
     rate will not exceed a(n)|_| fixed  average maximum rate of ____ % or |_| a
     floating maximum rate of the greater of ___% or the Bank's Prime Rate;  and
     the interest rate will not decrease below a fixed minimum rate of ___ %. If
     an average maximum rate is specified,  a determination of any required
     reimbursement  of interest by Bank will be made: |_| when Note is repaid in
     full by Borrower |_| annually beginning on _____________

|_|  Fixed rate of _____% per annum through ________________ which automatically
     converts on _____________ to a variable rate equal to the Bank's Prime Rate
     plus _____% per annum which shall be adjusted as such Prime Rate changes.

|_|  ___________________________________________________________________________

     PRINCIPAL AND  INTEREST  ARE PAYABLE AS FOLLOWS

|_|  Principal  plus any accrued interest not otherwise scheduled herein _______
     ___________________________ is  due  in  full at maturity on ______________

|_|  Principal plus accrued interest

|_|  Payable in consecutive ____________________ installments of  |_|  Principal
     commencing on ____________________ |_| Principal and Interest _____________
     and continued on the same day of each calendar period thereafter, _________
     in equal payments of $____________, with one final payment of all remaining
     principal and accrued interest due on ___________________.

|_|  Business ChoiceLine Payment Option: 2% of outstanding balance is payable
     monthly commencing on _______ and continuing on the same day of each
     calendar  period  thereafter,  with one final  payment of all  remaining
     principal  and  accrued  interest  due on   ___________________.

|X|  Accrued  interest is payable  MONTHLY commencing on September 25, 1999  and
     continuing  on the  same  day of each  calendar period thereafter, with one
     final  payment  of all  remaining   principal  and  accrued costs, fees and
     interest due on AUGUST 25, 2000.


                                  Page 1 or 8

<PAGE>

|_|  Bank reserves the right in its sole discretion to adjust the fixed  payment
     due hereunder ____________ on _____________ and continuing on the  same day
     of each calendar period thereafter, in order to maintain an amortization
     period of no more than ________________  months from the date of this Note.
     Borrower understands the payment may increase if interest rates increase.

|X|  Prior to an event of default, Borrower may borrow, repay, and reborrow
     hereunder pursuant to the terms of the Loan Agreement, hereinafter defined.

|X|  SEE ADDENDUM TO PROMISSORY NOTE FOR ADDITIONAL TERMS, WHICH ARE HEREBY
     INCORPORATED.

     In addition,  the undersigned promises to pay to Bank, or order, a late fee
in the amount of five percent (5%) of any installment  past due for fifteen (15)
or more days. When any installment  payment is past due for fifteen (15) or more
days,  subsequent  payments shall first be applied to the past due balance.  All
interest  shall be computed and charged for the actual number of days elapsed on
the basis of a year  consisting  of three hundred sixty (360) days. In the event
periodic  accruals of interest  shall exceed any periodic  fixed payment  amount
described  above,  the fixed payment amount shall be immediately  increased,  or
additional supplemental interest payments required on the same periodic basis as
specified  above  (increased  fixed  payments  or  supplemental  payments  to be
determined in the Bank's sole discretion),  in such amounts and at such times as
shall be  necessary  to pay all  accruals  of  interest  for the  period and all
accruals of unpaid interest from previous periods. Such adjustments to the fixed
payment  amount or  supplemental  payments shall remain in effect for so long as
the interest  accruals  shall exceed the original fixed payment amount and shall
be  further  adjusted  upward or  downward  to reflect  changes in the  variable
interest rate;  provided that unless elected  otherwise above, the fixed payment
amount shall not be reduced below the original  fixed payment  amount.  However,
Bank shall have the right,  in its sole  discretion,  to lower the fixed payment
amount below the original payment amount.

     This Promissory Note ("NOTE") is given by the undersigned pursuant to and/
     or in connection with the following agreements  and instruments:   (if any)
     Deed(s) of Trust/S.C. Mortgage(s) granted in favor of Bank as beneficiary /
     mortgagee:

|_|  dated ___________________ in the maximum principal amount of $ ____________
     granted by ________________________________________________________________

|_|  dated ___________________ in the maximum principal amount of $ ____________
     granted by ________________________________________________________________
     Security Agreement(s) granting a security interest to Bank: _______________

|X|  dated AUGUST 20, 1999 granted by DATAMETRICS CORPORATION, A DELAWARE
     CORPORATION

|_|  dated _________________ granted by ________________________________________

|X|  Loan Agreement dated AUGUST 20, 1999 executed by DATAMETRICS CORPORATION, A
     DELAWARE CORPORATION

|X|  LIMITED RECOURSE GUARANTY EXECUTED BY  ROY DOUMANIU AND CARL K. DOUMANI

|X|  STANDBY LETTER OF CREDIT IN THE AGGREGATE AMOUNT OF ONE MILLION FIVE
     HUNDRED THOUSAND DOLLARS ($1,500,000.00).

     All  of  the  terms,   conditions  an  covenants  Of  the  above  described
instruments and agreements and instruments (the "Agreements") are expressly made
a part of this Note by  reference in the same manner and with the same effect as
if set forth  herein at length  and any holder of this Note is  entitled  to the
benefits of and remedies  provided in the Agreements and any other agreements by
and between the undersigned and the Bank.

                                  Page 2 of 8
<PAGE>
     In addition to collateral  pledged  pursuant to the terms of the Agreements
(if any)  described  above,  the  undersigned,  as  collateral  security for the
indebtedness  evidenced by this Note, hereby grants the Bank a security interest
and lien in and to all deposit accounts, certificates of deposit, securities and
stocks  now or  hereafter  in  Bank's  possession  or on  deposit  with the Bank
including  but not  limited  to the  following  pledged  to Bank:  BB&T  Savings
Account(s)/Instruments(s),  including  all  renewals,  amendments,  and proceeds
thereof (if applicable):

|_|  # __________________ in the amount of $ ________________ in the name(s) of

|_|  # __________________ in the amount of $ ________________ in the name(s) of

|_|  ___________________________________________________________________________

     If any stock or  securities  are  pledged  to Bank  herein,  the pledge and
security  interest  includes all cash  dividends,  stock  dividends  and splits,
reissued  shares,  substituted  shares,  and all  proceeds  thereof,  which  the
undersigned promises to deliver to Bank.

     No delay or omission on the part of the Note holder in exercising any right
hereunder  shall  operate as a waiver of such right or of any other right of the
Note  holder,  nor shall any delay,  omission  or waiver on any one  occasion be
deemed a bar to or  waiver  of the  same or of any  other  right  on any  future
occasion.  Each of the  undersigned and every endorser or guarantor of this Note
regardless of the time, order or place of signing,  waives presentment,  demand,
protest and notices of every kind and assents to any one or more  extensions  or
postponements  of  the  time  of  payment  or  any  other  indulgences,  to  any
substitutions,  exchanges  or  releases  of  collateral  if at any time there be
available to the Note holder  collateral  for this Note, and to the additions or
releases  of any other  parties  or  persons  primarily  or  secondarily  liable
herefor.

     The failure to pay any part of the  principal or interest  when due on this
Note or to fully perform any covenant,  obligation or warranty on this or on any
other  liability  to the  Bank by any one or  more  of the  undersigned,  by any
affiliate of the  undersigned as defined in 11 USC Section (101) (2)), or by any
guarantor  or surety of this Note (such  affiliate,  guarantor,  and surety each
herein called Obligor),  or if any financial  statement or other  representation
made to the Bank by any of the  undersigned  or any Obligor shall be found to be
materially incorrect or incomplete,  or in the event of default under any of the
Agreements or any other  obligation of any of the  undersigned or any Obligor in
favor of the Bank, or in the event the Bank demands that the undersigned  secure
or provide additional  security for its obligations under this Note and security
deemed adequate and sufficient by the Bank is not given when demanded, or in the
event one or more of the  undersigned  or any Obligor  shall die,  terminate its
existence,  allow the  appointment  of a receiver for any part of its  property,
make an  assignment  for the benefit of creditors,  or where a proceeding  under
bankruptcy or insolvency  laws is initiated by or against any of the undersigned
or any  Obligor,  or in the event the Bank should  otherwise  in good faith deem
itself, its security interest,  or any collateral unsafe or insecure;  or should
the Bank in good faith believe that the prospect of payment or other performance
is impaired, or if there is an attachment,  execution, or other judicial seizure
of all or any portion of the  Borrower's or any Obligor's  assets,  including an
action  or  proceeding  to seize any funds on  deposit  with the Bank,  and such
seizure is not  discharged  within 20 days, or if final judgment for the payment
of money shall be  rendered  against  the  Borrower or any Obligor  which is not
covered  by  insurance  and shall  remain  undischarged  for a period of 30 days
unless  such  judgment  or  execution  thereon  is  effectively  stayed,  or the
termination of any guaranty  agreement  given in connection with this Note, then
any one of the same shall be a  material  default  hereunder,  and this Note and
other  debts due the Bank by any one or more of  undersigned  shall  immediately
become due and payable without notice, at the option of the Bank. From and after
any  event  of  default  hereunder,  interest  shall  accrue  on the  sum of the
principal  balance and accrued  interest then  outstanding  at the variable rate
equal to the Bank's Prime Rate plus 5% per annum ("Default Rate"), provided that
such rate shall not exceed at any time the highest rate of interest permitted by
the laws

                                  Page 3 of 8
<PAGE>

of the State of Maryland;  and further provided that such rate shall apply after
judgement.  In the event of any default,  the then  remaining  unpaid  principal
amount and accrued but unpaid interest then  outstanding  shall bear interest at
the Default Rate called for  hereunder  until such  principal  and interest have
been paid in full. In addition, upon default, the Bank may pursue its full legal
remedies at law or equity,  and the balance due hereunder may be charged against
any obligation of the Bank to any party including any Obligor. BANK SHALL NOT BE
OBLIGATED TO ACCEPT ANY CHECK,  MONEY ORDER, OR OTHER PAYMENT  INSTRUMENT MARKED
"PAYMENT  IN FULL" ON ANY  DISPUTED  AMOUNT DUE  HEREUNDER,  AND BANK  EXPRESSLY
RESERVES THE RIGHT TO REJECT ALL SUCH PAYMENT INSTRUMENTS.  BORROWER AGREES THAT
TENDER OF ITS CHECK OR OTHER  PAYMENT  INSTRUMENT  SO MARKED WILL NOT SATISFY OR
DISCHARGE ITS OBLIGATION  UNDER THIS NOTE,  DISPUTED OR OTHERWISE,  EVEN IF SUCH
CHECK OR PAYMENT  INSTRUMENT IS  INADVERTENTLY  PROCESSED BY BANK UNLESS IN FACT
SUCH PAYMENT IS IN FACT SUFFICIENT TO PAY THE AMOUNT DUE HEREUNDER. IF THIS NOTE
IS PLACED WITH AN ATTORNEY FOR  COLLECTION,  THE UNDERSIGNED   AGREES TO PAY, IN
ADDITION TO PRINCIPAL AND INTEREST,  ALL COSTS OF COLLECTION,  INCLUDING BUT NOT
LIMITED TO REASONABLE ATTORNEYS' FEES.

     The term "Prime Rate," if used herein, means the rate of interest per annum
announced by the Bank from time to time and adopted as its Prime Rate,  which is
one of several  rate indexes  employed by the Bank when  extending  credit.  Any
change in the  interest  rate  resulting  from a change in the Bank's Prime Rate
shall become  effective as of the opening of business on the  effective  date of
the change. All obligations of the undersigned and of any Obligor shall bind his
heirs, executors, administrators,  successors, and assigns. Use of the masculine
pronoun  herein shall include the feminine and the neuter,  and also the plural.
If more than one party shall execute this Note, the term  "undersigned"  as used
herein shall mean all the parties  signing  this Note and each of them,  and all
such  parties  shall be jointly  and  severally  obligated  hereunder.  Wherever
possible,  each  provision of this Note shall be interpreted in such a manner to
be effective and valid under  applicable  law, but if any provision of this Note
shall be  prohibited  by or invalid  under  such law,  such  provision  shall be
ineffective  but only to the extent of such  prohibition or invalidity,  without
invalidating the remainder of such provision or the remaining provisions of this
Note.  The proceeds of the loan evidenced by this Note may be paid to any one or
more of the undersigned. From time to time the maturity date of this Note may be
extended,  or this  Note may be  renewed  in whole or in part,  or a new note of
different form any be substituted  for this Note, or the rate of interest may be
modified,  or changes may be made in consideration  of loan extensions,  and the
Note  holder,  from time to time may waive or  surrender,  either in whole or in
part any rights,  guaranties,  secured interest, or liens, given for the benefit
of the Note holder in  connection  with the payment and the securing the payment
of this Note; but no such occurrence shall in any manner affect,  limit, modify,
or otherwise  impair any rights,  guaranties  or security of the Note holder not
specifically  waived,  released,  or  surrendered  in  writing,  nor  shall  the
undersigned Borrower makers, or any obligor either primarily or contingently, be
released  from such event.  The Note holder,  from time to time,  shall have the
unlimited  right to  release  any person  who might be liable  hereon,  and such
release  shall not affect or discharge  the liability of any other person who is
or might be liable hereon. No waivers and modifications shall be valid unless in
writing and signed by the Bank. The Bank may, at its option, charge any fees for
the modification,  renewal,  extension,  or amendment of any of the terms of the
Note  permitted by applicable  laws. In case of a conflict  between the terms of
this Note and the Loan  Agreement  or  Commitment  Letter  issued in  connection
herewith,  the priority of controlling  terms shall be first this Note, then the
Loan Agreement, and then the Commitment Letter if the Commitment Letter survives
closing.  This Note shall be governed by and  construed in  accordance  with the
laws of Maryland.

                                  Page 4 of 8

<PAGE>

                      CREDIT LIFE AND DISABILITY INSURANCE
                      ------------------------------------

Subject to certain underwriting  criteria and limitations,  INDIVIDUAL BORROWERS
AND  ADDITIONAL  CO-MAKERS  HAVE THE RIGHT TO REQUEST CREDIT LIFE AND DISABILITY
INSURANCE  PROTECTION  FOR  THIS  LOAN.  One or two  Borrowers/Co-makers  may be
covered by BB&T Credit Lite lnsurance and one  Borrower/Co-maker  may be covered
by BB&T Credit Disability  Insurance.  However,  the purchase of credit life and
credit  disability  insurance from the Bank is not a condition of obtaining this
loan.


     1, the  undersigned,  desire the credit  insurance  with the cost and terms
     described below and promise to pay the premium of such insurance  coverage.
     I understand that I may cancel this credit insurance at any time.


     |_|   Product I: Complete the following:  |_|  Fidelity Security Insurance
           Company Flex Plan (Complete separate appplication)
<TABLE>
<CAPTION>
     <S>                           <C>                 <C>            <C>                  <C>
     CREDIT LIFE INSURANCE          Effective Date      Term in Mos.   Initial Ins. Amount  Credit Life Premium
     |_|   Single  |_|   Level
     |_|   Joint   |_|   Decreasing ______________      ___________    $__________________    $________________
     CREDIT DISABILITY INSURANCE    Monthly Benefit Amount             Credit Disability Premium
     Effective Date and Terms in Mos.
     Same as Credit Life Insurance Above

     -------------------------      $----------------------            $--------------------------
</TABLE>

Credit  Disability  Insurance  is subject to a 14-day  elimination  period and a
60-month  maximum  benefit  period.  Only the Borrower or Co-Maker who signs the
first line under  "Signature(s)  of  Borrower"  is covered by Credit  Disability
Insurance.

Signature(s) of Borrowers                       Total Credit Life and Disability
                                                      Insurance Premium


- ------------------------------------
   Signature of Primary Borrower

- ------------------------------------           $________________________________
   Signature of Secondary Borrower



                         (SIGNATURES ON FOLLOWING PAGE)

                                  Page 5 of 8

<PAGE>

                                      BB&T
                         PROMISSORY NOTE SIGNATURE PAGE


Borrower:            DATAMETRICS CORPORATION, a Delaware corporation

Account Number: ____________________                  Note Number : ____________

Note Amount: _______________________                  Date:    August 20, 1999
                                                               -----------------

NOTICE OF RIGHT TO COPY OF APPRAISAL:  If a 1-4 family  residential  dwelling is
pledged as collateral  for this Note,  you, the  undersigned,  have a right to a
copy  of  the  real  estate  appraisal  report  used  in  connection  with  your
application for credit. If you wish to receive a copy, please notify the Bank in
writing at the branch  office  where you applied  for  credit.  You must mail or
deliver  your  request  to the Bank no later than 90 days after the date of this
Note.  In your  request  letter,  please  provide  your name,  mailing  address,
appraised  property  address,  the date of this Note,  and the  Account and Note
Numbers shown on the front of this Note.

SHARING OF  INFORMATION  WITH  AFFILIATES.  Applicable law permits Bank to share
information  with third parties  about its credit and account  history with you.
Applicable law also permits Bank to share additional  information  about you and
your  accounts  with  companies  related to BB&T by common  ownership or control
("Affiliates"). We provide this additional information to our Affiliates so that
you may receive  special  offers and  promotions  from our  Affiliates.  You may
request that Bank not furnish this additional information (other than credit and
account  history)  to our  Affiliates  by  writing to Branch  Banking  and Trust
Company, Client Services  Administration,  P.O. Box 1847, Wilson, North Carolina
27894-1847.  Please include your name, address, telephone number, account number
(if known),  and social security (tax  identification)  number. Due to marketing
programs already in progress,  please allow a reasonable period of time for your
request to take effect. In order for us to communicate important loan or deposit
account information, we will continue to notify you through occasional statement
inserts  or other  customer  service  mailings.  Please be aware  that state and
federal laws impose certain  mandatory  disclosures  of customer  information by
financial  institutions.  We  must  comply  with  laws  that  require  mandatory
production or disclosure.

                                  Page 6 of 8

<PAGE>

IN WITNESS WHEREOF,  the  undersigned,  on the day and year first written above,
has caused this note to be executed under seal.


                          IF BORROWER IS A CORPORATION:


ATTEST:                          DATAMETRICS CORPORATION, a Delaware corporation
                                 NAME OF CORPORATION

Title:                           By:  /s/ Daniel P. Ginns
                                      Daniel P. Ginns, Chairman of the Board

                                      Title: Chief Executive Officer

     (Affix seal or
     insert name of
     corporation in
     seal to adopt as
     seal of Borrower)           By:____________________________________________

                                 Title:_________________________________________

            IF BORROWER IS A PARTNERSHIP, LIMITED LIABILITY COMPANY,
                        OR LIMETED LIABLILTY PARTNERSHIP

WITNESS:                           _____________________________________________
                                                NAME OF PARTNERSHIP, LLC, OR LLP


___________________________        By:___________________________________ (SEAL)
                                           GENERAL PARTNER OR MANAGER


___________________________        By:____________________________________(SEAL)
                                           GENERAL PARTNER OR MANAGER


___________________________        By:____________________________________(SEAL)
                                           GENERAL PARTNER OR MANAGER

                          IF BORROWER IS AN INDIVIDAUL


WITNESS:                             ____________________________________ (SEAL)


__________________________           ____________________________________ (SEAL)

                                  Page 7 of 8

<PAGE>


                              ADDITONAL  CO-MAKERS


WITNESS:                             ____________________________________ (SEAL)


____________________________         ____________________________________ (SEAL)


____________________________         _____________________________________(SEAL)


____________________________         ____________________________________ (SEAL)


____________________________         _____________________________________(SEAL)

                                  Page 8 of 8
<PAGE>


                           ADDENDUM TO PROMISSORY NOTE

WITNESSETH:

     The following  additional terms are  incorporated  into the Promissory Note
dated  August 20, 1999,  by and between  Branch  Banking and Trust  Company (the
"Bank"), and Datametrics Corporation, a Delaware corporation (the "Borrower"):

     1. Notices. The Bank shall give Borrower written notice of any default, and
the Borrower shall  thereafter have ten (10) business days to cure said default.
Notices shall be given to Borrower by  hand-delivery  to the  Borrower's  office
located at 25 B Hanover Road, Suite 305, Florham Park, New Jersey 07932, or sent
via facsimile  transmission to (973)  377-5736,  or sent by overnight mail via a
nationally  recognized  overnight  delivery  service  to  either  of  Borrower's
addresses  listed  above,  or by United  States  mail,  first-class  and postage
prepaid to either of Borrower's  addresses listed above. All notices required or
permitted  to be given  hereunder  to the Bank  shall be  hand-delivered  to the
Lender at 3505 Hamilton Street,  Hyattsville,  Maryland 20782, Attn:  Commercial
Lending, or sent by United States Mail, postage prepaid, registered or certified
with return receipt requested to the aforesaid address.

     If any written  notice is mailed via  first-class  mail, it shall be deemed
effective  on the earlier of actual  receipt or on the third (3rd)  calendar day
following date of mailing; notices sent by overnight delivery shall be effective
twenty-four  (24)  hours  after  being  deposited  with the  overnight  delivery
company;  and notice delivered in person, by registered or certified mail, or by
facsimile transmission shall be effective upon actual delivery or transmission.
 Any party may change its address or  facsimile  number for notice  hereunder to
another location within the continental United States by giving thirty (30) days
written notice to the other party in the manner set forth above.

     2.  CONFESSED  JUDGMENT.  UPON THE  OCCURRENCE  OF A DEFAULT  WITHOUT  CURE
THEREOF  WITHIN ANY  APPLICABLE  CURE PERIODS,  BORROWER  HEREBY  AUTHORIZES ANY
ATTORNEY  DESIGNATED  BY THE BANK OR ANY  CLERK OF ANY COURT OF RECORD TO APPEAR
FOR BORROWER IN ANY COURT OF RECORD AND CONFESS  JUDGMENT  WITHOUT PRIOR HEARING
AGAINST  BORROWER  IN FAVOR OF THE BANK FOR,  AND IN THE  AMOUNT  OF, THE UNPAID
BALANCE OF THE PRINCIPAL  AMOUNT OF THIS NOTE,  ALL INTEREST  ACCRUED AND UNPAID
THEREON,  ALL OTHER  AMOUNTS  PAYABLE BY BORROWER TO THE BANK UNDER THE TERMS OF
THIS NOTE OR ANY OTHER AGREEMENT,  DOCUMENTS, INSTRUMENT EVIDENCING, SECURING OR
GUARANTYING  THE  OBLIGATIONS  EVIDENCED  BY  THIS  NOTE,  COSTS  OF  SUIT,  AND
REASONABLE ATTORNEY'S FEES.

                                  Page 9 or 8

<PAGE>

     Borrower hereby  releases,  to the extent  permitted by applicable law, all
errors and all rights of exemption, appeal, stay of execution,  inquisition, and
other rights to which  Borrower may otherwise be entitled  under the laws of the
United  States of America or of any state or  possession of the United States of
America now in force and which may hereafter be enacted. The authority and power
to appear for and enter judgment  against Borrower shall not be exhausted by one
or more exercises thereof or by any imperfect  exercise thereof and shall not be
extinguished by any judgment  entered  pursuant  thereto.  Such authority may be
exercised on one or more occasions or from time to time in the same or different
jurisdictions as often as the Bank shall deem necessary or desirable, for all of
which this Note shall be a sufficient warrant.

                         [Signatures on following page.]

                                  BORROWER:

Attest:                           DATAMETRICS CORPORATION, a
                                    Delaware corporation


__________________________      By:  /s/ Daniel P. Ginns       (Seal)
                                     ------------------------------------------
                                    Daniel P. Ginns, Chairman of the Board,
                                    Chief Executive Officer

                                  Page 10 of 8



                                                                Hyattsville, MD.
                                                                ----------------
                                                                 August 20, 1999
                                                                ----------------

                                      BB&T
                               SECURITY AGREEMENT




         In  order to  secure  (i) the  payment  of a  promissory  note or notes
(collectively the "Note") dated as of August 20, 1999 and executed and delivered
by Datametrics Corporation,  a Delaware corporation (the "Borrower(s)"),  to the
Bank in the aggregate principal sum of $1,500,000.00 payable as provided therein
(the Note and any loan agreement or other agreement  executed in connection with
the loan secured hereby are  incorporated  herein by reference);  (ii) all other
obligations and liabilities (whether direct or indirect, absolute or contingent,
primary or  secondary,  sole or joint and  several)  now  existing or  hereafter
arising of the Borrower to the Bank;  and (iii)  performance  by the Borrower or
the Debtor (as hereinafter  defined) of the agreements  hereinafter set forth or
contained in any loan  agreement or other  agreement  entered into in connection
with the loan (all  obligations  secured  hereby are referred to as the "Secured
Obligations"),  the Borrower,  or if the Collateral (as hereinafter  defined) is
not owned by the Borrower,______________________________________________________
________________________________________________________________________________
________________________________________________________________________________
(such owner of the Collateral  being  hereinafter  referred to as the "Debtor"),
hereby  grants to BRANCH  BANKING  AND TRUST  COMPANY  (the  "Bank") a  security
interest in the following property including any and all additions, replacements
and substitutions of all or any part thereof (and other items of property of the
same class) whether now owned or hereafter  acquired or arising and all proceeds
thereof   (including   insurance   proceeds)   (all   collectively   called  the
"Collateral").

         Collateral  will be located at addresses  listed below until such times
as written  consent to a change of location is  obtained  from the Bank.  If the
Collateral is or includes  vehicles or goods that are mobile and ordinarily used
in more than one  location,  such  vehicles or goods will be kept at the address
set forth below except for temporary and ordinary use in other locations. If the
Collateral is or includes  Accounts.  all records  concerning  such Accounts are
located at the address set forth below.

         /_/       All Equipment, including but not limited to the following:
         /_/       Equipment, more specifically described as follows: __________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
(Unless  otherwise   specified  above,  the  term  "Equipment"  shall  have  the
definition given it in the Maryland  Uniform  Commercial Code (Annotated Code of
Maryland,  Commercial  Law Article  ss.9-109) and shall include all  accessions,
parts, attachments, tools, operating manuals, and all replacements therefor.)

         /_/       Vehicles described below:

                                      -1-

<PAGE>

                                               Serial    If Truck - Ton & Class
    New/Used    Year/Make    Model/Body/Type   Number    If Mobile Home - #2 S/N

1.

2.

3.

4.

5.


         /_/        Farm Products described below (describe all crops, livestock
and supplies that are used or produced in the farming operation and that are to
serve as security): ____________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
including  products of the described drops or livestock in their  unmanufactured
states in the Debtor's possession and any offspring of the described  livestock.
(Unless  otherwise  specified  above,  "Farm Products" shall have the definition
given it in the Maryland  Uniform  Commercial  Code (Annotated Code of Maryland,
Commercial Law Article ss.9-109).)


|X| All Accounts, including but not limited to the following:
                                                         all accounts receivable
                                                         of   Debtor,   wherever
                                                         located  or  generated,
                                                         including  accounts  in
                                                         New Jersey and Florida

/_/      Accounts, more specifically described below:
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________



                                      -2-
<PAGE>

________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
(The term "Accounts"  shall have the definition given it in the Maryland Uniform
Commercial Code (Annotated Code of Maryland,  Commercial Law Article 59-106), no
matter how evidenced,  including accounts receivable,  contract rights,  checks,
notes, drafts, acceptances, and other forms of obligations and receivables).


|X| All Inventory, including but not limited to the following: all inventory of
                                                               Debtor, wherever
                                                              located, including
                                                              inventory in New
                                                              Jersey and Florida

|_| Inventory, more specifically described below:

________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
(Unless otherwise  specified above,  "Inventory" shall have the definition given
it in  the  Maryland  Uniform  Commercial  Code  (Annotated  Code  of  Maryland,
Commercial Law Article ss.9-109).

|_|      All Goods, including all furniture and fixtures, including but not
         limited to the following:

|_|      Goods, including furniture and fixtures, more specifically described as
         follows:

________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
(Unless otherwise specified above, "Goods" shall have the definitions given them
in the Maryland Uniform Commercial Code (Annotated Code of Maryland,  Commercial
Law Article ss.9-105).

|_|      All Documents, Instruments, Chattel Paper, and General Intangibles,
         including but not limited to the following:

|_|      Documents, Instruments, Chattel Paper, and General intangibles, more
         specifically described as follows:

                                      -3-

<PAGE>
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
(Unless otherwise specified above, "Documents," "'Instruments," "Chattel Paper,"
and "General  Intangibles" shall have the definitions given them in the Maryland
Uniform  Commercial  Code (Titles 1 through 10 of the  Commercial Law Article of
the Annotated Code of Maryland).)

Debtor warrants and agrees that:
1.       USE OF COLLATERAL.-The Collateral is and will be used for o personal

         |X| business     |_| farming purposes

If checked  here o the  Collateral  is being  acquired  with the proceeds of the
advance as evidenced by this agreement and the Note, which proceeds the Bank may
disburse directly to the seller of Collateral as shown on the Bank's records. If
acquired  with such  advance the  Collateral  was  delivered to the Debtor on or
before ____________________________

2.  DEBTOR'S  RESIDENCE OR PLACE OF BUSINESS.  Debtor's  residence  (or place of
business if Debtor is an organization) is 25 B Hanover Road, #305, Florham Park,
New Jersey 07932

(if the Debtor is an organization  and has more than one place of business,  use
the chief  executive  office.)  The Debtor will  immediately  notify the Bank in
writing of any change in the Debtor's residence (or place of business).

3.       Chief Executive Office.  If the Collateral is a type normally used in
more than one state or includes Accounts or General Intangibles and the Debtor
has a place of business in more than one state. the Debtor's chief executive
office (if different from the address set out in item 2) is

- ----------------    ----------------    --------------      ------------
(No. and Street)    (City or Town)      (County)            (State)

and the Debtor will immediately  notify the Bank in writing of any change in the
Debtor's  chief  executive  office.  If  certificates  of title  are  issued  or
outstanding in respect to any of the Collateral,  Debtor will cause the interest
of the Bank to be  properly  noted  thereon and will cause the  certificates  of
title to be delivered to the Bank.

4. FIXTURES; CROPS; TIMBER; MINERALS. If the Collateral is to be affixed to real
estate or includes crops growing or to be grown,  timber to be cut,  minerals or
Accounts arising from the sale of minerals,  the real estate and record owner of
the real  estate is  described  above  (name of record  owner not  necessary  if
Collateral  is crops  growing or to be grown).  If the  Collateral is affixed to
such real  estate  prior to the  perfection  of the  security  interest  granted
hereby.  Debtor,  on demand of the Bank, will furnish the Bank with a disclaimer
or disclaimers  of any interest in the  Collateral  signed by all persons having
any interest in the real estate.  The Debtor will (i) notify the Bank in writing
of any intended sale, mortgage, granting of a deed of trust or conveyance of the
realty and give  written  notice of the terms and  conditions  of this  Security
Agreement to any  prospective  purchaser,  mortgagee,  beneficiary  of a deed of
trust or grantee of a

                                      - 4 -

<PAGE>

conveyance of said realty and a copy of such notice to the Bank and (ii) cause a
Request for Copy of Notice  providing tor notice to the Bank and  satisfying the
requirements of Annotated Code of Maryland,  Real Property  Article  ss.7-105 or
any successor  provision to be filed as to each  existing or future  mortgage or
deed of trust.


5.       ACCOUNTS.  If the Collateral is or includes Accounts,
                  (a)      each   Account   represents   a  valid  and   legally
                           enforceable  indebtedness  according to its terms and
                           as  represented by its  corresponding  invoice and is
                           subject to no offsets, counterclaims, contra accounts
                           or any other  defense of any kind and  character  and
                           will  be   subject  to  no   discounts,   deductions,
                           allowances or offsets, with an unpaid balance legally
                           owing  in the  amount  set  forth  in the  respective
                           invoice, which balance is not yet due;
                  (b)      the goods or merchandise  sold have been delivered to
                           such  customers  or to the  carrier,  or the services
                           have been performed for such customers, in accordance
                           with any  contracts  or purchase  orders  between the
                           Debtor and its customers;

                  (c)      the sales or rendering  of services  that created the
                           Accounts   were  not  in  violation  of  any  law  or
                           governmental regulation or order;

                  (d)      at the request of the Bank.

                           (i)      the Debtor will keep all collections of the
                                    Accounts separate from all other funds and
                                    property.  Such funds will be delivered to
                                    the Bank at the time and in the form
                                    requested by the Bank.  The Bank will have
                                    the right at any time to notify account
                                    debtors of the Bank's security interest in
                                    the Accounts and to request that payment  of
                                    the Accounts be made directly to the Bank.
                                    The Bank is hereby appointed the true and
                                    lawful attorney-in-fact of the Debtor to
                                    receive, endorse in the name of the Debtor
                                    and collect any and all checks made payable
                                    to the Debtor issued in payment of the
                                    Accounts;
                           (ii)     all  collections of the Accounts will be set
                                    forth on  itemized  schedules,  showing  the
                                    name of the  account  debtor,  the amount of
                                    each payment,  and such other information as
                                    the Bank may request;
                           (iii)    all collections of the Accounts delivered to
                                    the Bank  (either by the Debtor or  directly
                                    by account debtors) will be deposited into a
                                    deposit  account subject to the sole control
                                    of the Bank. The Bank will have the right at
                                    all  times  and in its  sole  discretion  to
                                    apply  all or  part  of the  funds  in  such
                                    deposit   account  to  the  payment  of  the
                                    Secured Obligations;
                           (iv)     the Debtor will  furnish  the Bank,  at such
                                    intervals as the Bank determines,  schedules
                                    of  the  Accounts  in a form  and  substance
                                    satisfactory to the Bank;
                           (v)      the Debtor  will  deliver to the Bank copies
                                    of all invoices and other documents relating
                                    to the Accounts; and
                           (vi)     the Debtor will not maintain  funds received
                                    from  collections  of the Accounts  with any
                                    bank other than the Bank.

                  (e)      the Bank will have the right,  at all times, to cause
                           verification  to be made  of the  Accounts  with  the
                           account  debtors,  with or without notice being given
                           to the account  debtors of the Bank's interest in the
                           Accounts,  and the Bank may,  during normal  business
                           hours of the Debtor,  examine the  ledgers,  books of
                           account,  records  and  papers of the  Debtor and all
                           evidence  in  support of any entry  thereon,  and the
                           Debtor agrees to produce such ledgers, books, records
                           and papers upon demand by the Bank.

6. DISCHARGE OF OBLIGATIONS.  Debtor will pay,  perform and discharge all of the
Secured  Obligations  as and when they become due and payable or  dischargeable;
except that if the Debtor and Borrower are not the same person and Debtor is not
a guarantor,  endorser or co-maker of the Note or other obligations,  the Debtor
shall be liable for payment of the Note or other  obligations only to the extent
of the Collateral.

                                      - 5 -

<PAGE>

7. OWNERSHIP.  Except for the security  interest  granted hereby,  Debtor is the
owner of the  Collateral  free and clear of all liens,  security  interests  and
other  encumbrances  except as previously  disclosed to Bank and will defend the
Collateral against the claims and demands of all persons.

8. WASTE.  Debtor will keep the Collateral in good order and repair,  reasonable
wear and tear  excepted,  shall not  waste or  destroy  or  permit  the waste or
destruction  of the  Collateral  or any  part  thereof  and  shall  not  use the
Collateral  in  violation  of any  application  statute,  ordinance or policy of
insurance thereon.

9. INSPECTIONS.  Debtor will permit the Bank or its representatives or agents to
inspect the Collateral at any time.

10.  INSURANCE.  Debtor  will  obtain  and keep in force such  insurance  on the
Collateral  as is normal and  customary in the Debtor's  business or as the Bank
may require, all in such amounts, under such forms of policies, upon such terms,
for such periods and written by such companies or  underwriters  as the Bank may
approve.  All policies of insurance will contain long form Lender's Loss Payable
clauses in favor of the Bank,  and the Debtor shall  deliver the policies to the
Bank as evidence of  compliance  with the  provisions  of this  paragraph.  Such
policies will be noncancellable  except upon thirty days prior written notice to
the Bank.  It is agreed  that the  proceeds of all such  insurance,  if any loss
should  occur,  may  be  applied  by the  Bank  to the  payment  of the  Secured
Obligations or to the replacement of any of the Collateral damaged or destroyed,
as the Bank may  elect or  direct  in its sole  discretion.  The  Debtor  hereby
appoints  (which  appointment  is  irrevocable  as  long  as any of the  Secured
Obligations remain  outstanding) Bank as its lawful  attorney-in-fact in making,
adjusting,  and settling claims under and canceling such insurance and endorsing
the Debtor's name on any drafts by insurers of the collateral.

11.  TAXES;  ASSESSMENTS.  Debtor  will  promptly  pay  when due all  taxes  and
assessments upon the Collateral or for its use or operation.

12. OTHER  LIENS;  SALE OF  COLLATERAL.  Debtor will not (a) permit or suffer to
remain,  and will  promptly  discharge,  any senior liens or security  interests
(other than the Bank's security  interest) on any of the Collateral;  (b) permit
any of the Collateral to be levied upon under any legal process;  (c) dispose of
any of the Collateral  without the prior written  consent of the Bank (provided,
however, that if the Collateral is or includes inventory,  such inventory may be
sold in the ordinary course of the Debtor's business); (d) permit anything to be
done that  might  impair  the  value of any of the  Collateral  or the  security
afforded by this agreement;  or (e) permit the Collateral to become an accession
to other goods which are not Collateral.

13. FURTHER DOCUMENTS.  Upon demand of the Bank, Debtor will furnish to the Bank
such  further  information  and  shall  execute  and  deliver  to the Bank  such
financing  statements  and other papers and shall do ail such acts and things as
the Bank may at any time or from time to time  request or as may be necessary or
appropriate to establish and maintain a perfected first security interest in the
Collateral as security for the Secured Obligations or to protect the Collateral,
and Debtor hereby  appoints the Bank as its lawful  attorney-in-fact  to execute
any such  documents  and do such acts and things at the Bank's  option  upon the
Debtor's refusal to act.

14. PROTECTION OF COLLATERAL.  The Bank may, in its discretion,  but will not be
required to, discharge taxes, liens, security interests or other encumbrances at
any time  levied  or  placed  on the  Collateral,  place  and pay for  insurance
thereon, order and pay for the repair, maintenance and preservation thereof, and
pay any necessary  filing or recording  fees. Any amount so expended by the Bank
(including  reasonable  attorneys'  fees) pursuant to the foregoing shall become
part of the  Secured  Obligations,  shall be payable  upon demand and shall bear
interest until paid at the rate applicable to the indebtedness  evidenced by the
Note. Until default the Debtor may have possession of the Collateral and use the
same in any lawful manner not inconsistent with this agreement or with the terms
and conditions of any insurance policy thereon.

15. DOCUMENTS;  INSTRUMENTS. If the Collateral includes documents or instruments
the Debtor has or will,  at the request of the Bank,  deliver the  Collateral to
the Bank to be held by the Bank.  The Debtor  will  execute any  endorsement  or
writing  upon the  documents or  instruments  as may be requested by the Bank in
order to evidence the pledge,  assignment and transfer of such Collateral to the
Bank,  and Debtor  hereby  appoints the Bank as its lawful  attorney-in-fact  to
execute any such  endorsements  or  writings  and do such acts and things at the
Bank's option upon the Debtor's

                                      - 6 -

<PAGE>

refusal to act. If the Secured  Obligations are paid in full and satisfied,  the
Bank will redeliver possession of such Collateral to Debtor and will execute any
endorsements or writings  reasonably  necessary to transfer such Collateral back
to Debtor (without recourse).

16.  DEFAULT.  The  occurrence  of any of the  following is a default under this
Agreement:

         (a)      Failure to pay or perform any of the Secured Obligations when
                  due;

         (b)      The falsity in any material  respect when made or furnished of
                  any warranty, representation or statement made or furnished to
                  the Bank (i) by or on behalf of Debtor in connection with this
                  agreement (including warranties and representations  contained
                  herein)  or (ii) by and on behalf of  Borrower  in  connection
                  with the Note or other  agreement  establishing  or evidencing
                  the Secured Obligations;

         (c)      Loss,  theft,  substantial  damage,  destruction,  disposition
                  (without prior written  consent),  encumbrance to or of any of
                  the Collateral,  or the levy,  seizure or attachment of any of
                  the Collateral;

         (d)  The  Bank in good  faith  deems  itself  or the  Collateral  to be
              insecure or unsafe;

         (e)      Death,  dissolution,  termination  of  existence,  insolvency,
                  appointment   of  a  receiver  of  any  of  the  property  of,
                  assignment   for  the   benefit  of   creditors   by,  or  the
                  commencement of any bankruptcy or insolvency  proceeding by or
                  against the Debtor or Borrower or any  guarantor  or surety of
                  the Debtor or Borrower.

17.  REMEDIES.  Upon  default the Bank,  at its  option,  may declare all of the
Secured  Obligations  to be  immediately  due and  payable and will have all the
rights arid  remedies of a secured party under the Maryland  Uniform  Commercial
Code,  including  without  limitation,  the  right  to  take  possession  of the
collateral under ss.9-503 of the Commercial Law Article of the Annotated Code of
Maryland,  or other applicable law and all rights provided herein,  in the Note,
or in any other applicable  security or loan agreement,  all of which rights and
remedies will, to the full extent permitted by law, be cumulative.  The Bank may
require Debtor to assemble the Collateral and make it available to the Bank at a
place to be designated by the Bank that is reasonably convenient to the Bank and
the Debtor.  The Debtor will supply  additional  collateral  as security for the
Secured Obligations if so requested by the Bank. Any notice of sale, disposition
or other intended action by the Bank sent to the Debtor at the address of Debtor
as may from time to time be shown on the Bank's records at least 5 days prior to
such  action  will  constitute  reasonable  notice to the  Debtor.  The Bank may
enforce any or all of its  remedies  against any  portion of the  Collateral  or
against other security or borrowers  without  affecting its right to enforce any
or all its remedies against any or all of the Collateral or other borrowers.

18.  MISCELLANEOUS.  This agreement and the security  interest in the Collateral
created  hereby will terminate  when the Secured  Obligations  have been paid in
full.  Debtor and Borrower  jointly and severally  agree to pay to the Bank upon
demand all costs and expenses (including reasonable attorneys' fees) incurred in
connection with the enforcement of this agreement,  and agree that all such fees
shall  become  part of the  Secured  Obligations.  No  waiver by the Bank of any
default will be effective unless in writing nor operate as a waiver of any other
default or of the same default on a future occasion.  No failure or delay of the
Bank to exercise its remedies  hereunder or take any action upon the  occurrence
of a default will operate as a waiver of that default or any other default.  All
rights of the Bank  hereunder  will inure to the benefit of its  successors  and
assigns,  and  all  obligations  of  the  Debtor  will  bind  the  heirs,  legal
representatives, successors and assigns of the Debtor. If there be more than one
Debtor, their obligations  hereunder will be joint and several.  Invalidation of
any one or more of the  provisions of this  agreement will not affect any of the
other  provisions  hereof,  which shall  remain in full force and  effect.  This
agreement  will be governed by and construed in accordance  with the laws of the
State of Maryland.  Captions are  inserted  for  convenience  only and in no way
limit or affect the provisions of this agreement. The terms "account debtor" and
"proceeds",  as used  herein,  will have the same  meanings  as they have in the
Uniform Commercial Code as adopted in Maryland.

                                      - 7 -

<PAGE>

WITNESS the hand and seal of the undersigned.

                           IF DEBTOR IS A CORPORATION:

ATTEST: ____________________     DATAMETRICS CORPORATION, a Delaware corporation
                                 -----------------------------------------------
                                                  Name of Corporation

Title:                           By:     /s/ Daniel P. Ginns
                                    --------------------------------------------
                                         Daniel P. Ginns, Chairman of the Board,

                                 Title: Chief Executive Officer
                                       -----------------------------------------
   CORPORATE SEAL
                                 By: ___________________________________________

                                 Title: ________________________________________

             IF DEBTOR IS A PARTNERSHIP, LIMITED LIABILITY COMPANY,
                        OF LIMITED LIABILITY PARTNERSHIP:

WITNESS:

_____________________________           __________________________
                                        NAME OF PARTNERSHIP, LLC, OR LLP

_____________________________           By: ______________________ (SEAL)
                                        GENERAL PARTNER OR MANAGER

_____________________________           By: ______________________ (SEAL)
                                        GENERAL PARTNER OR MANAGER

 _____________________________          By: ______________________ (SEAL)
                                        GENERAL PARTNER OR MANAGER

                                        By: ______________________ (SEAL)
 _____________________________          GENERAL PARTNER OR MANAGER


                           If DEBTOR IS AN INDIVIDUAL:

WITNESS:


_____________________________           ____________________________
                                              TYPE NAME OF DEBTOR

                                            ______________________ (SEAL)

                                        __________________________
                                             TYPE NAME OF DEBTOR

_____________________________               ______________________ (SEAL)

                                      - 8 -


                                      BB&T

                               GUARANTY AGREEMENT



BRANCH BANKING AND TRUST COMPANY                   _____________________________

Dear Sirs:

         As an inducement to Branch Banking and Trust Company ("Bank') to extend
credit  to and to  otherwise  deal  with  Datametrics  Corporation,  a  Delaware
corporation.  ("Borrower"),  and in consideration  thereof, the undersigned (and
each  of the  undersigned  jointly  and  severally  if  more  than  one)  hereby
absolutely and unconditionally guarantees to Bank and its successors and assigns
the due and punctual payment of any and all notes,  drafts,  debts,  obligations
and  liabilities,  primary  or  secondary  (whether  by  way of  endorsement  or
otherwise), of Borrower, at any time, now or hereafter, incurred with or held by
Bank,  together  with  interest,  as and when the same  become due and  payable,
whether by acceleration  or otherwise,  in accordance with the terms of any such
notes, drafts,  debts,  obligations or liabilities or agreements  evidencing any
such indebtedness,  obligation or liability  including all renewals,  extensions
and modifications  thereof.  The obligation of the undersigned is a guarantee of
payment and not of collection.

         The undersigned is Bank's debtor for all indebtedness,  obligations and
liabilities  for which this  Guaranty is made,  and Bank shall also at all times
have a lien on and security  interest in all stocks,  bonds and other securities
of the undersigned at any time in Bank's possession and the same shall at Bank's
option  be  held,  administered  and  disposed  of as  collateral  to  any  such
indebtedness,  obligation or liability of the  Borrower,  and Bank shall also at
all  times  have  the  right of  set-off  against  any  deposit  account  of the
undersigned  with Bank in the same  manner and to the same extent that the right
of set-off may exist against the Borrower.

         It is understood that any such notes,  drafts,  debts,  obligations and
liabilities may be accepted or created by or with Bank at any time and from time
to time without notice to the undersigned,  and the undersigned hereby expressly
waives presentment,  demand,  protest, and notice of dishonor of any such notes,
drafts,  debts,  obligations  and  liabilities  or other  evidences  of any such
indebtedness, obligation or liability.

         Bank may receive and accept from time to time any  securities  or other
property as a  collateral  to any such notes,  drafts,  debts,  obligations  and
liabilities, and may surrender,  compromise, exchange and release absolutely the
same or any part  thereof  at any time  without  notice to the  undersigned  and
without in any manner  affecting the obligation and liability of the undersigned
hereby  created.  The  undersigned  agrees that Bank shall have no obligation to
protect, perfect, secure or insure any security interests, liens or encumbrances
now or hereafter held for the  indebtedness,  obligations  and  liabilities  for
which this Guaranty is made.

         This obligation and liability on the part of the undersigned shall be a
primary, and not a secondary, obligation and liability, payable immediately upon
demand  without  recourse  first having been had by Bank against the Borrower or
any other guarantor, person, firm or corporation, and without first resorting to
any property held by Bank as collateral  security;  and the  undersigned  hereby
waives the benefits of all  provisions  of law for stay or delay of execution or
sale of property or other  satisfaction  of judgment  against the undersigned on
account of  obligation  and  liability  hereunder  until  judgment  be  obtained
therefor  against the Borrower and execution  thereon returned  unsatisfied,  or
until  it is  shown  that  the  Borrower  has  no  property  available  for  the
satisfaction of the indebtedness,  obligation or liability guaranteed hereby, or
until any other  proceedings  can be had; and the  undersigned  hereby agrees to
indemnify the Bank for all costs of collection, including but not limited to the
costs of repossession,  foreclosure, reasonable attorneys' fees, and court costs
incurred by the Bank in the event that the Bank should  first be required by the
undersigned  to resort to any property held by the Bank or in which the Bank has
a security  interest or to obtain execution or other  satisfaction of a judgment
against the Borrower on account of Borrower's  obligation  and liability for its
indebtedness guaranteed hereby; and the

                                      -1-

<PAGE>

undersigned   further  agrees  that  the  undersigned  is  responsible  for  any
obligation  or debt, or portion  thereof,  of the Borrower to the Bank which has
been  paid by the  Borrower  to the Bank  and  which  the  Bank is  subsequently
required  to  return  to the  Borrower  or a  trustee  for the  Borrower  in any
bankruptcy or insolvency  proceeding;  and the  undersigned  further agrees that
none of the undersigned  shall have any right of subrogation,  reimbursement  or
indemnity  whatsoever,  nor any right of recourse to security  for the debts and
obligations of the Borrower to Bank unless and until all of the debts and
obligations of the Borrower to Bank have been paid in full. The undersigned
hereby  waives,  to the extent  avoidable  under any provision of the Bankruptcy
Code, any right arising upon payment by the undersigned of any obligation  under
this Guaranty to assert a claim against the bankruptcy estate of the Borrower.

Check applicable box:

|_|      This Guaranty is unlimited and applies to all indebtedness of Borrower,
         whether now existing or hereafter arising.

|_|      This  Guaranty  applies  to all  indebtedness  of Borrower evidenced by
         its promissory note numbers ____ ated _______(including all extensions,
         renewals,and modifications thereof) in the aggregate principal   amount
         of $ ___________.

|X|      This  Guaranty is limited to an amount of  $_____________  plus accrued
         interest,  late fees, costs of collection  (including  attorneys' fees)
         and all other  obligations  and  indebtedness  which  may  accrue or be
         incurred with respect to the Borrower's indebtedness and obligations to
         Bank.

         To secure the payment of all obligations of the undersigned  hereunder,
the  undersigned  hereby  grants a security  interest and lien in the  following
goods and property owned by the undersigned:____________________________________
________________________________________________________________________________
               **SEE ADDENDUM TO GUARANTY (INCORPORATED HEREIN BY
            REFERENCE) FOR GUARANTY SECURITY TERMS** ("Collateral").
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
_________________________________________________________________("Collateral").
The  undersigned  hereby  agrees to execute  and  deliver  to Bank any  security
agreement,  deed of trust, mortgage, UCC financing statement,  or other document
required  by the Bank in order to protect its  security  interest or lien in the
Collateral.  This  document  shall  constitute  a security  agreement  under the
Uniform  Commercial  Code of  Maryland  ("Code"),  and in addition to having all
other legal rights and remedies,  the Bank shall have all rights and remedies of
a secured party under the Code.

         This  agreement  shall inure to the benefit of Bank, its successors and
assigns, and the owners and holders of any of the indebtedness,  obligations and
liabilities hereby guaranteed,  and shall remain in force until a written notice
revoking it has been received by Bank; but such revocation shall not release the
undersigned  from liability to Bank,  its successors and assigns,  or the owners
and  holders of any of the  indebtedness,  obligations  and  liabilities  hereby
guaranteed, for any indebtedness,  obligation or liability of the Borrower which
is hereby  guaranteed and then in existence or from any renewals,  extensions or
modifications thereof in whole or in part, whether such renewals,  extensions or
modifications  are made before or after such revocation,  with or without notice
to the undersigned.  The undersigned  waives  presentment,  demand,  protest and
notices of every kind and assents to any one or more extensions,  modifications,
renewals  or  postponements  of the  time or  amount  of  payment  or any  other
indulgences  given to Borrower.  The  undersigned  shall be responsible  for and
shall  reimburse  the Bank for all  costs  and  expenses  (including  reasonable
attorneys' fees) incurred by the Bank in connection with the enforcement of this
Guaranty or the protection or  preservation of any right or claim of

                                      -2-

<PAGE>

the Bank in connection herewith, including without limitation costs and expenses
incurred  by  the  Bank  in   connection   with  its  attempts  to  collect  the
indebtedness, obligations, and liabilities guaranteed hereby.

         If  the  Borrower  is  a  corporation,   this  instrument   covers  all
indebtedness,  obligations  and  liabilities  to Bank  purporting  to be made or
undertaken  on behalf of such  corporation  by any such officer or agent of said
corporation without regard to the actual authority of such officer or agent. The
term  'corporation"  shall include  associations  of all kinds and all purported
corporations, whether correctly and legally chartered and organized.

         The undersigned  covenants,  warrants, and represents to the Bank that:
(i) this guaranty is enforceable  against the undersigned in accordance with its
terms;  (ii) the  execution  and delivery of this  Guaranty  does not violate or
constitute a breach of any agreement to which the undersigned is a party;  (iii)
that there is no litigation, claim, action or proceeding pending or, to the best
knowledge of the  undersigned,  threatened  against the undersigned  which would
materially  adversely  affect the financial  condition of the undersigned or his
ability to fulfill his obligations hereunder;  and (iv) that the undersigned has
knowledge of the Borrower's financial condition and affairs.

         This Guaranty is made in and shall be construed in accordance  with the
laws and judicial  decisions of the State of Maryland.  The  undersigned  agrees
that any dispute arising out of this Guaranty shall be adjudicated in either the
state or federal courts of Maryland and in no other forum, For that purpose, the
undersigned  hereby  submits to the  jurisdiction  of the state  and/or  federal
courts of Maryland.  The undersigned waives any defense that venue is not proper
for any action brought in any federal or state court in the State of Maryland.

         Witness the signature and seal of each of the undersigned.

WITNESS

_________________________          __________________________(SEAL)

_________________________          __________________________(SEAL)

          Address of Guarantor(s): ________________________

                                   ________________________

         California, Los Angeles County

         I, ____________, Notary Public of Los Angeles County, do hereby certify
that__________  personally  appeared before me this day and acknowledged the due
execution of the foregoing instrument in writing.

Witness my hand and seal, this____ day of__________, 1999.


My Commission Expires:                               ---------------------------
                                                     Notary Public

                                      - 3 -

<PAGE>


                         ADDENDUM TO GUARANTY AGREEMENT

WITNESSETH:

         The  following  additional  terms are  incorporated  into the  Guaranty
Agreement  dated  August  ___,  1999,  by and between  Branch  Banking and Trust
Company (the "Bank"), and Roy Doumani (the "Guarantor"):

         1. Notices.  Pursuant to the terms set forth in that certain Promissory
Note from Datametrics Corporation, a Delaware corporation ("Borrower") to Branch
Banking and Trust  Company  (the  "Bank"),  the  Borrower is entitled to written
notice of any default from Bank with a cure period of ten (10)  business days to
cure said default. Prior to exercising its rights in the collateral as described
more fully  hereinbelow,  the Bank shall give the undersigned  Guarantor written
notice of any default which has not been cured by Borrower,  and the undersigned
Guarantor  shall have an additional  ten (10) business days to cure said default
of Borrower.

         Notices shall be given to Guarantor by  hand-delivery  to the Guarantor
at  the  following  address:  _______________________,  or  sent  via  facsimile
transmission  to  __________,  or  sent  by  overnight  mail  via  a  nationally
recognized overnight delivery service to Guarantor's address listed above, or by
United  States mail,  first-class  and postage  prepaid to  Guarantor's  address
listed  above.  All notices  required or permitted to be given  hereunder to the
Bank shall be hand-delivered to the Lender at 3505 Hamilton Street, Hyattsville,
Maryland 20782, Attn: Commercial Lending, or sent by United States Mail, postage
prepaid,  registered or certified with return receipt requested to the aforesaid
address.

         If any  written  notice is mailed  via  first-class  mail,  it shall be
deemed effective on the earlier of actual receipt or on the third (3rd) calendar
day  following  date of mailing;  notices  sent by overnight  delivery  shall be
effective  twenty-four  (24) hours  after  being  deposited  with the  overnight
delivery  company;  and notice  delivered in person,  by registered or certified
mail, or by facsimile  transmission  shall be effective upon actual  delivery or
transmission.  Any party may change its address or  facsimile  number for notice
hereunder to another  location  within the  continental  United States by giving
thirty  (30) days  written  notice to the other  party in the  manner  set forth
above.

                                      -4-

<PAGE>

         2.  COLLATERAL/RECOURSE.  To induce the Bank to extend credit to and to
otherwise  deal with Borrower,  Guarantor  caused the issuance of an irrevocable
Standby  Letter of Credit  [Credit  Number ______] from US Trust in favor of the
Bank in the sum of  __________Dollars  ($_________.00)  as  collateral  for this
Guaranty. Notwithstanding anything to the contrary contained in the Guaranty, in
the event of default  without cure thereof within any applicable cure periods by
Borrower and/or  Guarantor,  the Bank's recourse against Guarantor shall limited
to the presentation of a sight draft to US Trust against said Letter of Credit.

         IN THE EVENT OF A CONFLICT BETWEEN THE GUARANTY AGREEMENT AND
THIS ADDENDUM TO GUARANTY AGREEMENT, THIS ADDENDUM TO GUARANTY
AGREEMENT SHALL CONTROL.

                                   GUARANTOR:

Witness:


__________________________         _______________________________ (Seal)




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