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INSTRUCTION MAdUAL
Models 1792,6422
Isolated BCD Outputs

Keithley instruments, Inc.
28775 Aurora Road/Cleveland, Ohio 44139/(216) 248-0400
WARRANTY

Keithley Instruments, inc. warrants this product to be free from defects
in material and workmanship for a period of 1 year from date of ship-
ment. During the warranty period, we will, at our option, either repair
or replace any product that proves to be defective.

To exercise this warranty, write or call your local Keithley represent-
ative, or contact Keithley headquarters in Cleveland, Ohio. You will be
given prompt assistance and return instructions. Send the instrument,
transportation prepaid, to the indicated service facility. Repairs will be
made and the instrument returned, transportation prepaid. Repaired
products are warranted for the balance of the original warranty period,
or at least 90 days.
LIMITATION OF WARRANTY
This warranty does not apply to defects resulting from unauthorized
modification or misuse of any product or part. This warranty also does
not apply to fuses, batteries, or damage from battery leakage.
This warranty is in lieu of all other warranties, expressed or implied, in-
cluding any implied warranty of merchantability or fitness for a par-
ticular use. Keithley Instruments, Inc. shall not be liable for any indirect,
special or consequential damages.

STATEMENT OF CALIBRATION

This instrument has been inspected and tested in accordance with
specifications published by Keithley Instruments, Inc.
The accuracy and calibration of this instrument are traceable to the
National Bureau of Standards through equipment which is calibrated at
planned intervals by comparison to certified standards maintained in
the Laboratories of Keithley Instruments, Inc.

KEITHLEY INSTRUMENTS, INC.
INSTRUMENT DIVISION / 28775 Aurora Road / Cleveland, Ohio 44139 / U.S.A. / (216) 248-0400 / Telex: 98-5469
WEST GERMANY: Keithley Instruments GmbH / Heiglhofstr. 5 / 8000 Munchen 70 / (089) 710020 / Telex: 52-l 2160
GREAT BRITAIN: Keithley Instruments, Ltd. I 1, Boulton Road I Reading, Berkshire RG 2 ONL / (0734) 86-12-87/88 /Telex: 84-7047
FRANCE: Keithley Instruments SARL / 2, Bis Rue Leon Blum / B.P. 60 / 91121 Palaiseau Cedex / (6) 011-51-55 I Telex: 600-933
NETHERLANDS: Keithley Instruments BV / Arkelsedijk 4 / Postbus 559 / 4200 AN Gorinchem I (0) 1830-25577 / Telex: 24-684
SWITZERLAND: Keithley Instruments SA I Kriesbachstr. 4 / 8600 Dubendorf I 01/821-94-44 / Telex: 57-536
AUSTRIA: Keithley Instruments Ges.m.b.H. / Doblinger Haupstr. 32 / 1190 Wien / 314 289 / Telex: 13-4500
MODELS 1792, 6422

I SOLATED BCD OUTPUTS

Third Printing, May 1981, Cleveland, Ohio U.S.A.

Document No. 30155, Rev. B
TABLE OF CONTENTS

SECTION TITLE PAGE

1. GENERAL INFORMATION ................... l-l

l-l. INTRODUCTION ...................... l-l

l-3. COHPATIBILITY. ..................... l-l

l-5. WARRANTY INFORMATION .................. l-l

l-7. CHANGE NOTICES ..................... l-l

l-9. SAFETY SYMBOLS ..................... l-l

l-11. SPECIFICATIONS ..................... l-l

2. INITAL PREPARATION ...................... 2-l

2-l. INTRODUCTION ...................... 2-l

2-3. UNPACKING AND INSPECTION ................ 2-l

2.5. PREPARATION FOR USE. .................. 2-l

2-7. MODEL 1792 INSTALLATION. ................ 2-3

2-9. Fidel 1792 Output Connections. ............ 2-3

2-11. IIODEL 6422 INSTALLATION. ................ 2-4

3. GPERATION ....................... .3-l

3-l. INTRODUCTION ...................... 3-l

3-3. OVERALL OPERATION. ................... 3-l

3-9. CIRCUIT DESCRIPTION. .................. 3-3

3-11. Control Circuitry. .................. 3-3

3-14 Switching Circuitry. ................. 3-4

3-16. Isolator Network ................... 3-4

3-18. Busy/Hold Circuit. .................. 3-4

3-20. Output Registers And Buffers ............. 3-5

3-22. DC-to-DC Converter .................. 3-5

3-24 TEST POINT DATA. .................... 3-5

3-26. SPECIAL HANDLING OF STATIC SENSITIVE DEVICES ...... 3-6

4. REPLACEMENTPARTS ................... 4-l

4-l. GENERAL. ........................ 4-l

4-3. ORDERING INFORMATION .................. 4-l

4-5. SCHEMATIC. ....................... 4-l

4-7. COM'ONENT LAYOUT .................... 4-l

I LLUSTRATI GNS

FIGURE TITLE PAGE

2-l Installation of Model 1792 ............... 2-2

2-2 Installation of Model 6422 ............... 2-5

3-1 Model 1792/6422 Block Diagram. ............... 3-l

3-2 Timing Diagram ..................... 3-2

3-3 Ring Counter and Gating. ................ 3-3

3-4 Busy/Hold Circuit. ................... 3-4
UODELS 1792, 6422 GENERAL INFORMATION

SECTION 1 GENERAL lNFGRMATI(%

l-l. I NTRODUCT I ON. l-5. WARRANlY INFGRMATIOIJ.

l-2. The Models 1792 and 6422 are isolated BCD l-6. The Warranty is given on the inside front

output options that convert displayed meter readings cover of this Instruction Manual. If there is a

to electrically isolated, latched, and buffered per- need to exercise the warranty, contact the Keithley

al lel 8CD outputs. These can be appl ied to I ine Representative in your area to determine the proper

printers or other external data hand1 ing equipment. action to be taken. Keithley maintains service fa-

Logic levels are TTL/DTL and CMOS compatible. cilities in the United Kingdom and West Germany, as

Output data includes sign and overrange signals. In well as in the United States. Check the inside

addition, a BUSY control I i ne indicates that the front cover of this Manual for addresses.

meter is updating data. The trailing edge of this
l-7. CHANGE NOTICES.
signal is normally used to initiate a print or load

operation at the listening device. An input control l-8. Improvements or changes to the equipment which

I ine (HOLD) al lows the listening device to inhibit occur after printing of the Instruction Manual will

the update of output data. When this line is high, be explained on a Change Notice sheet attached to

the data update rate is the same as the meter the inside back cover.

conversion rate, typically 2.5 readings/second.

Operating characteristics for the Models l-9. SAFETY SYMOBCLS
6422 and

1792 are given in their respective Specification l-10. Safety symobls used in thls manual are as
Tables (Table l-l and l-2). Both options can be fol lows:
either factory or field installed. Separate

installation procedures are provided in this manual, IM3oRTANT

because of the different mounting and output cabling The n ! symbol can be found in various places in
provisions of the options. this manual. Careful ly read the associated CAU-

TION statements with regard to proper use and
l-3. CGf+`ATIBILITY.
handling of the equipment. Damage to the equip-
l-4. The Model s 1792 and 6422 interface options ment may occur if these precautions are ignored.
are compatible with the following Keithley
Thist symbol can be found In various places in
I nstr unents:
this manual. This symbol indicates those areas on
Model 6422
the equipment which are potential shock hazards.
Model 642 Electrometer Serial Nunber 53402A and
Careful ly read the associated WARNING statements
above.
with regard to proper use and hand1 Ing of the
Mode I 1792 equipment. Serious personal injury may result if
Model 179 DMFl Serial Nunber 20000 and above. these precautions are ignored.
Model 179-20A DMFl all Serial Numbers.

Model 177 DMM Serial Nunber 14500 and above. 1-11. SPECIFICATIONS.

Model 480 Picoammeter Serial Nunber 12000 and l-12. Detailed specifications for the Model 1792
above. Note: First 3-l/2 digits at BCD auf-put and 6422 are given In Tables l-l and 1-2,
same as Model 480 display. respectively.

l-l
GENERAL INFORMATION MODELS 1792, 6422

SPECIFICATIONS

TABLE I-1 TABLE l-2

SPECIFICATIONS, MODEL 1792 ISOLATED BCD OUTPUT SPECIFICATIONS, MODEL 6422 ISOLATED BCD OUTPUT

OUTPUTS : 4-l/2 digit parallel BCD, polarity, OUTPUT: 4-l/2 digit parallel BCD, polarity,

overrange bit, busy. overrange bit, busy.

BUSY: Low during output update (5Oms max). BUSY: Low during output update (50111s max).

OUTPUT UPDATE RATE: Same as meter conversion rate OUTPUT UPDATE RATE: Same as meter conversion

(2.5 reading/second typical). rate (2.5 reading/second

CONTROL : E inhibits subsequent output updates typical).

when low. CONTROL : HOLD inhibits subsequent output updates

when low.
LOGIC LEVELS: TTL/DTL and CMOS compatible.

Output High = 4.5V minimum while LOGIC LEVELS: TTL/DTL and CF%X compatible.

sourcing lOOkA. Output High = 4.5V minimum while

Low = 0.5V maximum while sourcing lOOpA.

sinking 3.2mA. Low = 0.5 maxlmum while

sinking 1 mA
Control High = open or 4V minimum.

Low = .5V maximum while Control High = open or 4V minimum.

sinking 1mA. Low = .5V maximum while

sinking 3.2mA
ISOLATION: All outputs and controls isolated from

meter up to 1400V peak, 105V*Hz. I SOLAT I ON : All outputs and controls isolated from

(lOlO, ,ll40pf typ1 meter up to 30V peak, 105VoHz.
(lolon II ,4OPf tYP)
ENVIRONMENT: Operate 0 to 55"C, 0 to 805 RH.

Storage' -25 to 7O'C. ENVIRONMENT: Operate 20

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