Racal Instruments 1994 User manual

PUBLICATION NO. 980601
Bi
UNIVERSAL TIMER/COUNTERS
Racal Instruments
RacaS Instruments, Inc.
4Goodyear St, Irvine, CA 92718-2002
Tel: (800) RACAL-ATE, [phone], [phone]; FAX: [phone]
Racal Instruments Ltd.
480 Bath Road, Slough, Berkshire, SL1 6BE, United Kingdom
Tel: [phone]; FAX: [phone]
Racal Systems Electronique S.A.
18 Avenue Dutartre, 78150 LeChesnay, France
Tel: [phone]; FAX: [phone]
Racal Systems Elettronlca Sri
Strada 2-Palazzo C4, 20090 Milanofiori Assago, Milan, Italy
Tel: [phone]; FAX [phone]
Racal Elektronik System GmbH
Frankenforster Strasse 21, 51427 Bergisch-Gladbach 1, Germany
Tel: [phone]; FAX: [phone]
PUBLICATION DATE: JULY 1991
Copyright© 1991 by Racal Instruments Inc. Printed in the United States of America. All rights reserved.
This book or parts thereof may not be reproduced in any form without written permission of the publishers.

WARRANTY STATEMENT
Products sold by Racal Instruments, Inc. are warranted to be free from defects in workmanship or
materials. Racal Instruments, Inc. will, at its option, either repair or replace any hardware products
which prove to be defective during the warranty period. You are avalued customer. Our mission is
to make any necessary repairs in areliable and timely manner.
Duration of Warranty
The warranty period for all Racal Instruments, Inc. hardware is one year, except software and
firmware products designated for use with Racal Instruments, Inc. hardware are warranted not to fail
to execute their programming instructions due to defect in materials or workmanship for aperiod of
ninety (90) days from the date of delivery to the initial end user.
Return of Product
Authorization is required from Racal Instruments before you send us your product. Call Customer
Support at 1-800-722-3262. You will be given repacking instructions. You will be required to return
your product prepaid UPS. Racal Instruments will pay the shipping costs back to you UPS Ground.
Limitation of Warranty
Racal Instruments, Inc. shall be released from all obligations under this warranty in the event repairs
or modifications are made by persons other than authorized Racal Instruments, Inc. service personnel
or without the written consent of Racal Instruments, Inc.
Racal Instruments, Inc. expressly disclaims any liability to its customers, dealers and representatives
and to users of its products, and to any other person or persons, for special or consequential damages
of any kind and from any cause whatsoever arising out of or in any way connected with the
manufacture, sale, handling, repair, maintenance, replacement or use of said products.
Representations and warranties made by any person, including dealers and representatives of Racal
Instruments, Inc. ,which are inconsistent or in conflict with the terms of this warranty (including but
not limited to the limitations of the liability of Racal Instruments, Inc. as set forth above), shall not
be binding upon Racal Instruments, Inc. unless reduced to writing and approved by an officer of Racal
Instruments, Inc.
Except as stated above, Racal Instruments, Inc. makes no warranty, express or implied (either in fact
or by operation of law), statutory or otherwise; and except to the extent stated above, Racal
Instruments, Inc. shall have no liability under any warranty, express or implied (either in fact or by
operation of law), statutory or otherwise.
PROPRIETARY NOTICE
This document and the technical data herein disclosed, are proprietary to Racal Instruments, and shall
not, without express written permission of Racal Instruments, be used, in whole or in part to solicit
quotations from acompetitive source or used for manufacture by anyone other than Racal Instruments.
The information herein has been developed at private expense, and may only be used for operation and
maintenance reference purposes or for purposes of engineering evaluation and incorporation into
technical specifications and other documents which specify procurement of products from Racal
Instruments.

FOR YOUR SAFETY
Before undertaking any maintenance procedure, whether it be a
specific troubleshooting or maintenance procedure described herein or
an exploratory procedure aimed at determining whether there has been
amalfunction, read the applicable section of this manual and note
carefully the WARNING and CAUTION notices contained therein.
The equipment described in this manual contains voltage hazardous to
human life and safety and which is capable of inflicting personal
injury. The cautionary and warning notes are included in this manual to
alert operator and maintenance personnel to the electrical hazards and
thus prevent personal injury and damage to equipment.
If this instrument is to be powered from the AC line (mains) through an
autotransformer (such as aVariac or equivalent) ensure that the
common connector is connected to the neutral (earthed pole) of the
power supply.
Before operating the unit ensure that the protective conductor (green
wire) is connected to the ground (earth) protective conductor of the
power outlet. Do not defeat the protective feature of the third
protective conductor in the power cord by using atwo conductor
extension cord or athree-prong/two-prong adaptor.
Maintenance and calibration procedures contained in this manual
sometimes call for operation of the unit with power applied and
protective covers removed. Read the procedures carefully and heed
Warnings to avoid ’’live'1circuit points to ensure your personal safety.
Before operating this instrument:
1. Ensure that the instrument is configured to operate on
the voltage available at the power source. See
Installation Section.
2. Ensure that the proper fuse is in place in the instrument
for the power source on which the instrument is to be
operated.
3. Ensure that all other devices connected to or in proximity
to this instrument are properly grounded or connected to
the protective third-wire earth ground.
If at any time the instrument:
—Fails to operate satisfactorily
—Shows visible damage
—Has been stored under unfavorable conditions
—Has sustained stress
It should not be used until its performance has been checked by
qualified personnel.

Amendment to
Racal Instruments Model 1994
Instruction Manual, Publication No. 980601
May 15, 1995
This amendment updates the drawing and parts list located in Sections 7and 8.
1. Page 7-4, 7-5, Chassis Assembly, 404391
a. Add "Note 8: Item 9to be soldered to bottom of Item 7
during test".
b. Change Revision letter to "F".
2. Page 7-17, PCB Assy, GPIB, 401760
a. No corrections. Change Revision letter to "G".
3. Page 7-18, Schematic, GPIB, 431760
a. Change Revision letter to "C".
b. Change Sheet 1, Zone B6 from "was" to "is" as shown below:
Was Is
4. Page 7-22, PCB Assy, BNC, 401762
a. No corrections. Change Revision letter to "F".
5. Page 7-25 Option 04A, Oscillator Assy, 404392
a. No corrections. Change Revision letter to "C".
6. Page 7-26, Oven Oscillator, 404397
a. Delete "9444" from drawing title.
b. Change Revision letter to "C".
7. Page 7-27, Option 04E, Oscillator, 404384
a. No corrections. Change Revision letter to "D".
8. Page 7-29, Cable Assy, Oscillator, 404691
a. Replace with assembly drawing on Page 3of this amendment.
9. Page 7-33, Option 41, Channel C, 404398
a. No corrections. Change Revision letter to "B”.
10
.
'
11.Page 7-35, Schematic, Channel C
a. Replace with Schematic on Page 4of this amendment.

12. Page 8-3, Chassis Assy Parts List, 404391
a. Add Lem 9, RI P/N R- 18- 1239, Screen, FSC 21793,
Manufacturer's P/N R- 18- 1239.
b. Revision letter is now "F".
13. Page 8-18, BNC Assy Parts List, 401762
a. Change Item 20 to RI P/N 601970, Terminal, Feed-thru,
Insulated, FSC 98291, Manufacturer's P/N 011-2103-000-
479.
b. Revision letter is now "F".
14. Page 8-20, Oscillator Assy Parts Lists, 404397
a. Change Item 1to RI P/N 92 1124, Oscillator, 5MHz, Fallout,
FSC 21793, Manufacturer's P/N 921124.
b. Revision letter is now "C".
15. Page 8-2 1,Cable Assy, Oscillator, Parts List, 40469
1
a. Change Item 22 to RI P/N 602094-900, Polarization Plug,
FSC 22526, Manufacturer's P/N 65307-001.
b. Change Item 23 to RI P/N 611311, Terminal, Crimp, FSC
22526, Manufacturer's P/N 48251-000.
c. Change Item 24 (J14) to RI P/N 602193-005, Connector,
Cable, Recept. 5-Pin, FSC 22526, Manufacturer's P/N 65039-
032.
d. Revision letter is now "E".
16. Page 8-23, Option 41, Channel CParts List, 404398
a. Change Item 7to RI P/N 616315, Screw, Metric, M3X6(2
Required).
b. Revision letter is now "B"
17. Pages 8-24 to 8-26, Channel C, PCB Parts List, 404389
a. Change C19 and C46 to RI P/N R-21-1779, Cap Chip, 2.2
PF, 50V, -f/-.25 PF, FSC 95275, Manufacturer’s P/N
VJ1206A2R2CXA.
b. Change D8 and D9 to RI P/N 210090, Diode, Silicon, FSC
50434, Manufacturer’s P/N 5082-2800.
c. Change IC3 to RI P/N R-22-5155, IC, AB6456A, FSC 21793,
Manufacturer's P/N R-22-5155.
d. Change Q4 to RI P/N R-22-6278, Transistor, AT-42035, FSC
24539, Manufacturer's P/N AT-42035.
e. Change R36 to RI P/N R-20-5763, Cap, Chip, 18 Ohm, 1/8
W, 5pet, FSC 65940, Manufacturer's P/N MCR18-18 Ohm-5
pet.
f. Revision letter is now "H ".

CONNECTOR

ADDENDUM
RACAL INSTRUMENTS MODEL 1994, OPTION 01
Addition to p. 1-15, Table 1.1 Specifications:
Option 01, Rear Panel Inputs
Inputs Aand B
Sensitivity at rear panel inputs is as specified on pp, 1-6 and 1-7.
Sensitivity at front inputs is not specified and will be degraded.
The following statement must be added to the following procedures:
p. 6-21, under NOTE in step (6) of paragraph 29
p. 6-23, under NOTE after step (7) of paragraph 33
p. 6-26, step (2) of paragraph 44
p. 6-27, step (1) of paragraph 45
p. 6-27, step (2) of paragraph 47
p. 6-28, step (1) of paragraph 48
p. 6-31, step (1) of paragraph 56
p. 6-32, step (2) of paragraph 58
p. 6-35, step (2) of paragraph 62
Procedure must be performed on rear inputs when Option 01 is installed.