Keithley 619 Service manual

Instruction Manual

Model 619

Electrometer/Multimeter

01981, Keithley Instruments, Inc.

Cleveland, Ohio, U.S.A.

SPECIFICATIONS

VOLTS TEMPERATURE

MAXIMUM t YR.. 23’ *ST &WC a 2860°C

RANGE

2Oh” 199.999XlO~ 0.01 %f25 0.00*%+30

2: z

200 v 199.999 0.02% + 10 0.002%+ 0.3

INPUT CAPACITANCE: Less than or equal to 2OpF. INPUT CAPACITANCE: Less than or equal to 2OpF.
INPUT RESISTANCE: Greater than or equal to 2OTi,. INPUT RESISTANCE: Greater than or equal to 2OTi,.
NMRR: Greater than 55dS (greater than SWS with FILTER). NMRR: Greater than 55dS (greater than SWS with FILTER).
CMRR: Greater than 1OOdS (greater than l25dS with FILTER). CMRR: Greater than 1OOdS (greater than l25dS with FILTER).
ANALOG SETTLING TIME ItoO.l% of final value, unfiltered): Lessthan ANALOG SETTLING TIME ItoO.l% of final value, unfiltered): Lessthan

5ms. 5ms.

REAOINQ * I%rdg + OO”“ts, * wrdg + EO”“b,,~C

1.99999 0.01 x7+,0 0.002%+ 3
19,999s 0.02% + 10 o.oo*%+ 0.3

AMPS AMPS

f.lAxlM”M 1 VR.. 23-*vc f.lAxlM”M 1 VR.. 23-*vc 019% * 2.a.wc 019% * 2.a.wc ANALOG ANALOG

RANOE READINO *,%rdg+co”“ts, *,%rdg+oO”“ts,,~C RANOE READINO *,%rdg+co”“ts, *,%rdg+oO”“ts,,~C

2 “A 1.99999x 10Q 2 “A 1.99999x 10Q 0.35% +a 0.35% +a

20 nA 19.9999x

20 nA 19.9999x

200 nPi 100.999 x lcr9 200 nPi 100.999 x lcr9 0.15% +26 0.15% +26 O.O1%C30 O.O1%C30

2 &A 1.99999x10-~ 2 &A 1.99999x10-~

20 +A 19.9999 x 106 20 +A 19.9999 x 106

200 PA 199.999 x 108 200 “A 199.999 x 108

2nlA 1.99999x lo-3

2nlA 1.99999x lo-3

20rnA 19.9999 x 10~3 0.15% + to cm,%+ 3

20rnA 19.9999 x 10~3 0.15% + to cm,%+ 3

INPUT VOLTAGE DROP: Less than ImV st full-scale except less than 0.6”
ANALOG SETTLING TIME Ito 0.1% of final value, unfllteredl: 2nA
NMRR: 2nA through 2+&n: 70dS; ZO,,A through ZA: 5EdS.

1.99999 0.15%125 0.01%+20

1.99999 0.15%125 0.01%+20

2A

2A

on 2A range.
through 2pA: 50ms; 20+A through 2A: 5ms.

OHMS TEMPERATwtE

MAXlMUM

RANOE READlNG

2 k0 1.99999x103

20 k0 19.9999x103

200 k” 199.999x101

aA* 1.99999 x 106

*ml* 19.9999x106

200M” 199.999x105

2 GO 1.99999x 109

20 0” 19.9999x109

200 GO 199.999x109

2 m 1.99999 x 10’2

OHMS CURRENT SOURCES: 2k0. 20kk ,OO&

ANALOG OUTPUT: Analog output voltage level is ths product of ths Ohms

current source and the resistance being measured.

ANALOG SE’ITLING TIMES:

To 0.1% of final value, unfiltered, with
less than lOOpF input cspacitsnce: 20Mn: 20ms.

To 10% of final value, unfiltered,
using 6191 Guarded Input Adapter
with less than IpF unguarded input ZOOGD: 15s
cap.acitance:

ACCURACY ACCURACY COEFFICIENT COEFFICIENT FULL SCALE FULL SCALE

lo-9

lo-9

ACCVRAC”

1 YR.. 23~*5%

* I%dc! + Cc.““uL,

ACCVRACV COEFFIUENT

TEMPERATURE TEMPERATURE

lN”ERTlNO lN”ERTlNO

0”TP”T 0”TP”T

0.02% + 30 0.02% + 30 0.2v 0.2v

0.35% +35 0.35% +35

0.15?6+,0 0.15?6+,0 o.ol%+ 3 o.ol%+ 3 2.0” 2.0”

0.15%+25 0.15%+25 ml%+30 ml%+30 0.2” 0.2”

0.15% + 10 0.15% + 10 o.ot%+ 3 o.ot%+ 3 2.0” 2.0”

0.1536+25 0.0,%+30

0.1536+25 0.0,%+30

0.2 % +25

0.2 sb+,o
o.w%+25

0.15%+10

0.35% + 25

0.35% + 10

0.36% + 10
I %flO

4 %flO

10 %+I0

zookn, ztvl*: rpA,
ZOMO, 2GO: IOnA.
20GO through 2To: lOOpA.

o.w?&+ 3 o.w?&+ 3 2.w 2.w

2k0 through 2Mn: 5ms.
ZOOMII 200ms.

2Gn: 150ms.
ZOGO: 1.5s.

2Tn: 150s.

0.2v 0.2v

0.2”

0.2”

2.w

2.w

None

None

IEEE-488 BUS IMPLEMENTATION

IRequlres installado” of Model 5193,:

Mu,t,,,ne Commands: DCL, LLO, SDC, GET.
Uniline Commands: IFC. REN. EOI. SRCl. ATN. Compatible with

IEEE-488-1978 standard.

PROGRAMMABLE PARAMETERS:

Front Panel Controls: Function, Range, Filter, Zero Check, Zero Correct.,

Baseline Stare, Baseline Suppress.

Internal Parameters: SKI Response. Trigger Modes, Binary or ASCII

Data Formsts. number of readings to be stored. dats terminators,
reading rates, integration period.

ADDRESS MODES: TALK DNLV and ADDRESSABLE.
READING RATES

GENERAL

DISPLAY: Numeric: 0.56” LED digits, 4%.digit mantissa @ 6.2rdgis

(5%.digits @ 2.4 rdg/s in high resolution mode), 2 digit wponent, decimal
point, signed exponent and mantissa.

OVERRANGE INDICATION: Display reads OFLO.

MAXIMVM ALLOWABLE INPUT: 250” rms DC to SOHz sinswave.
INPUT CURRENT ,18=‘-28°C,: Less than 0.4pA.
EXTERNAL TRIGGER: TTL compatible EXTWNAL TRIGGER and ELEC-

TROMETER COMPLETE.

INPUT CONNECTORS 16194 Electrometer rear panel,: 2A range: 5-w”

binding posts. All other functions and ranges via Teflon” insulated ttisxial
connector.

OUTPUT CONNECTORS: Analog: Amphenol Series SO (MicrophoneI.

6194 Electrometer rear panel. IEEE: Amphenol or Cinch Series 57. 6193

IEEE Interface rear panel. SNC lchassis isolated) connecfions for EXTER­NAL TRIGGER and ELECTROMETER COMPLETE,

MAXIMUM ALLOWABLE COMMON MODE VOLTAGES:

Input LO IChannel A) to line ground: 250” rms, DC to 60Hz sinewsve.
Input LO IChannel SI to line ground: 250” rms, DC to 60Hr sinewave.
Input LO IChannel A, to Input LO IChannel 61: 250” m,s, DC to SOHz

sinewave.

WARMUP: 1 hour to rated sccuracy.

POWER: 90-110, 105-125, 180-220 ar210-250”. 50 or 60Hz ,intemal switch

selected). 75W max., 100WA max. (intsmsllv fan cooled).

ENVIRONMENTAL LIMITS: Operstlng: On-50°C, up to 35OC at 70% non

condsnsina R.H. Storage: -2OOC to 70°C.

DIMENSIOk, WEIGH6 432mm wide x 127mm high x 406mm deep

(17” x 5” x V.7’~. stackable enclosure. Net weight, S.Skg 122 Ibs.1 with
Chsnnel S Electrometer module and IEEE-488 lntsfface module.

ACCESSORIES SUPPLIED: One Model 6194 Electrometer Module and one

Model 6011 input Cable.

ACCESSORIES AVAILASLE:

Model 1OlgA: 5%” Universal Fixed Rack Mounting Kit
Model 10195: Universal Slide Rack Mounting Kit
Model 6011: Trisxisl Input Cable. lm (3 ft.)
Model 6191: Guarded input Adapter
Model 6193: IEEE-488 Interface
Model 6194: Electrometer Module
Model 6195: Maintenance Kit
Model 7008-3: IEEE-488 Cable 13 ft.,
Made, 7009.6: IEEE-488 Cable 16 ft.,

TABLE OF CONTENTS

Paragraph

1.1

1.2

1.3

1.4

1.5

1.6

1.7

2.1

2.2

2.3

2.4

2.5

2.6

2.7

2.8

2.9

2.9.1

2.9.2

2.9.3

2.9.4

2.9.5

2.9.6

2.9.7
2 9.8
2 9.9

2.9.10

7.10
:2.10.1

2.10.2

2.10.3

2.11

2.12

2.13

2.14

2.14.1

2.14.2

2.15

2.16

2.17

2.18

2.19

2.20

2.21

2.22

2.23

2.24

2.25

2.26

2.27

2.28

2.29

2.30

Title

SECTION 1. GENERAL INFORMATION

Introduction .............................................................

Features ................................................................

Warrantylnformation .....................................................

ManualAddenda .........................................................

Safety Symbols and Terms ................................................

Unpackingandfnspection .................................................

Specifications ............................................................

SECTION 2. OPERATION

Introduction ..................................................

PreparationforUse ............................................

Pre-power Up Programming ....................................

Powerup..~ ..................................................

BeeperSelection ..............................................

TAlk Only Mode/Addressable Mode Selection

.....................

Reading Rate Selection ........................................

Operating Instructions .........................................

FrontPanelFunctions ..........................................

Annunciator and Display Group ...............................

Function Selector Group .....................................

DualChannel ...............................................

Volts, Amps and Ohms. ......................................

Range Selection ............................................

zero Controls ...............................................

Baseline Controls. ...........................................

......................................................

Filter

Resolution .................................................

Current Ranges, Common Input ...............................

ExternalFeedbackUse.. .......................................

ExternalTrigger .............................................

Charge ....................................................

Logarithmic Currents ........................................

Non-Decade Current Gains .....................................

System Operation (Using the Model 6193 IEEE-488 Interface)

Address Selection ..............................................

Bus Management Lines ........................................

Bus Commands Implemented .................................

Input Channel Control (Secondary Address is a or bl

..............

DataFormat ..................................................

ASCllFormat .................................................

Binan/Format ................................................

Programmable Terminator, .....................................

BufferReadings ...............................................

MeasurementTime ............................................

ReadingRateModes ...........................................

........................................................

Filter

ZeroCheck ...................................................

zerocorrect ..................................................

Baseline Store ................................................

Baseline Suppression ..........................................

Default Conditions ............................................

Talk-OnlyMode

...............................................

SRQ Status Byte Format .......................................

MachineStatus.. .............................................

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2-1

2-3
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2-5
2-6

2-7
2-7
2-7

2-14
2-14
2-15
2-16
2-16

2-16
2-16
2-16
2-16
2-16
2-18
2-18
2-18

TABLE OF CONTENTS (CONT.)

Paragraph

3.1

3.2

3.3

3.4

3.5

3.6

3.7

3.8

4.1

4.1.1

4.1.2

4.2

4.2.1

4.2.2

4.2.3

4.2.4

5.1

5.2

5.3

5.3.1

5.4

5.4.1

5.5

5.5.1

5.6

5.6.1

5.7

5.7.1

5.8

5.8.1

5.9

Title

SECTION 3. ACCESSORIES

Introduction
Model 6191 Guarded Input Adapter

Model 6193 IEEE Standard 488 Output ..............

Model 6194 Electrometer Module ..................

Model 6195 Calibration Cover
Model 6199 Rack Mounting Kit with Chassis Slides

Model 7008 IEEE-488 Digital Cable. ................

Model 6011 Triax Input Cable .....................

SECTION 4. PERFORMANCE VERIFICATION

Introduction ....................................

Required Test Equipment. ......................

Environmental Conditions ......................

Model 619 PerformanceVerification

Initial Conditions ..............................

Voltage Verification. ...........................

Current Verification, ...........................

Resistance Verification .........................

SECTION 5. THEORY OF OPERATION

Introduction ...................................................................................

PowerSuply ...................................................................................

Model 6194 Electrometer Module .................................................................

Theory of Operation for the Model 6194 Electrometer Module

Model 6193 IEEE-488 Interface Board

IEEE Interface Board Theory of Operation

CPUBoard ....................................................................................

CPUTheoryofOperation ......................................................................

IsolatorBoard .................................................................................

lsolatorBoardTheon/ofOperation

Display/Keyboard .............................................................................

Display/Keyboard Theory of Operation

A/DBoard ...................................................................................

A/DTheon/ofOperation .....................................................................

Filter/MultiplexerBoard ........................................................................

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4-1
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4-l
4-l
4-2

5-I

5-1

5-2

5-2

5-5

5-5

5-7
5-7
5-9

5-11
5-12
5-12
5-13
5-13
5-14

6.1

6.2

6.2.1

6.3

6.4

6.5

6.6

6.6.1

6.7

6.7.1

6.8

6.9

6.10

6.11

6.12

6.13

6.14

ii

SECTION 6. MAINTENANCE

Introduction ...................................................................................

Pre-PowerUpProgramming .....................................................................

LineVoltageandFrequencySelection

BeeperSelection ...............................................................................

ReadingRateSelection .........................................................................

Calibrationlntroduction .........................................................................

Calibration/Test Equipment and Conditions

Recommended Test Equipment and Related lnfromation

InformationandAssumptions ....................................................................

Standards

Volts .........................................................................................

Amps

Ohms ........................................................................................

EnvironmentalCondltlons .........................................................................

Calibration ....................................................................................

Calibration Cover Installation .....................................................................

Calibration Adjustments .........................................................................

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6-l
6-l
6-l
6-l
6-2
6-2
6-3
6-3
6-3
6-3
6-3
6-4

6-5
6-5
6-5
6-5
6-5

TABLE OF CONTENTS (CONT.)

Paragraph

6.15

6.16

6.17

6.18

6.18.1

6.18.2

6.19

7.1

7.2

7.3

7.4
7-5

Title

CalibrationFixture

Construction Information ........................................................................ 6-9

Calibration of 1.9GO Source ...................................................................... 6-9

Troubleshooting ............................................................................... 6-9

Special Handling of Static Sensitive Devices.,

TroubleshootingProcedure ................................................................... 6-10

FanFilterCleaning ............................................................................. 6-10

SECTION 7. REPLACEABLE PARTS

Introduction ................................................................................... 7-l

PartsList ...................................................................................... 7-l

Ordering Information ........................................................................... 7-l

FactoryService.. .............................................................................. 7-l

Schematic Diagrams and Component Location Drawings.

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6-8

6-9

7-l

iii

LIST OF ILLUSTRATIONS

Figure

2-l
2-2 Model 619 Front Panel Functions
2-3
2-4 Model 6194 Electrometer Input Circuitry
2-5
2-6
2-7

2-8 TimingDiagram ................................................................................ 2-12

2-9
2-10
2-11

z-12
3-l
3-2
3-3
3-4
3-5
3-6
4-l
4-2
4-3

5-l
5-2
5-3
5-4
5-5
6-l
6-2
6-3
6-4
6-5
6-6
6-7
6-8
6-9
6-10
6-11
7-l
7-2
7-3
7-4
7-5
7-6
7-7
7-8
7-8

Model619RearPanel ............................................................................. 2-2

...................................................................

Common Input Current Range

ChargeMeasurement ............................................................................. 2-9

Logarithmic Current Measurement. ................................................................. 2-9

Non-Decade Current Gain Measurement. ........................................................... 2-10

Start of Signal Integrate From Trigger (t1) (Trigger is a Negative Going Pulse)

BinaryFormat .................................................................................. Z-15

StatusByte .................................................................................... 2.19

MachineStatus ................................................................................. 2-19

Model619lGuardedAdapter
Model 6193 IEEE Standard 488 Output
Model 6194 Electrometer Module.
Model6195MaintenanceKit
Model 6199 Rack Mounting Kit with Chassis Slides.

Model6OllTriaxlnputCable ...................................................................... 3-3

Resistance Source Shielding.

Resistance Source Shielding and Guarding
Measuring Resistance Sources Using Model 6191

Model619BlockDiagram..

PowerSupply ................................................................................... 5-2

Electrometer Module Block Diagram

DataBusBuffer ................................................................................. 5-7

Memon/Map
IsolatorBoardandSwitches
Calibration Cover
Supply Calibration ,200mV

Supply Calibration 2 Volt .......................................................................... 6-7

RangeCalibrationZOmA.. ........................................................................ 6-7

RangeCalibration20nA ........................................................................... 6-8

RangeCalibration20kdl ........................................................................... 6-8

RangeCalibrationZOGD

Calibration Fixture Schematic Diagram

Model619lGuardedAdapter ..................................................................... 6-11

IntegratorOutputWaveform

MotherBoard3041lC ........................................................................... 7-31

DisplayBoard32003D ........................................................................... 7-33

Power Supply Board 32004D ..................................................................... 7-37

IEEE Interface Board 30329D

ProcessorBoard32005D

lsolatorBoard32006D

A/D Converter Board 30395D

Electrometer Module Board 30387D

Electrometer Module Board 3039lD

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Title

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2-2
2-7
2-8

2.13

3-l
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3-2
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3-3

4-:3

4.:I
4-Z

5-1
5-3

5-10

6-2
6-6
6-7

6-9

6-10
6-12

7-39

7-41
7-43
7-45
7-47
7-49

iv

LIST OF ILLUSTRATIONS (CONT.)

Figure

7-9
7-10
7-11
7-12
7-13
7-14
7-15
7-16
7-17
7-17
7-18

Filter Mux Board 30352D.

Mother Board Schematic 30517D ....................

Display Board Schematic 30515D ....................

Power Supply Schematic 305161)

IEEE Interface Schematic30518D ....................

Processor Schematic (CPU) 30519D
Isolator Schematic 3052OD.
A/D Converter Schematic 30521 D

Electrometer Module Schematic 305221) ..............

Electrometer Module Schematic 30523D
Filter Mux Schematic30524D

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7-51
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7-65
7-67
7-69

7-71

LIST OF TABLES

Table
2-1

2-2
2-3
2-4
2-5
2-6
2-7
2-8
2-9
2-10
2-11
2-12
2-13

Z-14
2-15
2-16
4-I
4-2
4-3
5-l

5-2

5-3

5-4
5-5
5-6
5-7
5-8
6-l
6-2
6-3
7-l
7-2
7-3
7-4
7-5
7-6
7-7
7-8

7-9
7-10

Title Page

MaximumInput ..................................................................................

ExternalFeedbackMeasurements ..................................................................

C,,Selection
SecondaryAddress
Function

......................................................................................... 2-11

Range
Continuous Times (Typical) in Milliseconds
One Shot Times (Typical) in Milliseconds (Trigger to First Byte Delay)
Operating Function Format
DataTerminators..

Data Storage Buffer Commands.
Additional Trigger Time to First Byte Time
ReadingRateModes

ErrorCodes ....................................................................................

DataCodes
ByteDefinitions
DCVoltagePerformaceCheck
DCCurrentPerformanceCheck

OhmsReferenceCheck ...........................................................................

RegisterCommands
RegisterCommands

JumpersforPROMSelection

RegisterCommands .............................................................................

Analog Bus Connector Pin Assignments Valid for Channel A.
Analog Bus Connector Pin Assignments Valid for Channel B

ElectrometerControl ............................................................................

Control Data Bit Designations

LineVoltageSelections ...........................................................................

Recommended Test Equipment
StaticSensitiveDevices
Cross-Reference of Manufacturers.

Display Board PC-514, Parts List ...................................................................

Power Supply PC-515, Parts List

IEEE Interface PC-517, Parts List ..................................................................

CPUBoardPC-518.PartsList .....................................................................

Isolator Board PC-519, Parts List

A/D Converter PC-520, Parts List

Electrometer Module PC-523 and PC-522, Parts List.
Filter Mux Board PC-521, Parts List

FanAssembly.PartsList .........................................................................

.................................................................................. 2-10

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....................................................................................... 2-11

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.................................. 2-14

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.................................................................. Z-16

.......... ., .............................................. 2-16

............................................................................ Z-17

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................................................................................ Z-20

..................................................................... 4-2

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2-3
2-5

2-13

2-19

4-2

5-9

5-11
5-16
5-17
5-18
5-19

6-l

7-4

7-10
7-12

7-20
7-30

vi

SECTION 1

GENERAL INFORMATION

1.1 INTRODUCTION
The Keithley Model 619 is a fully programmable, micro-

processor based Electrometer/Multimeter. Its broad
measurement range is from 2nA. with IOOfA (IO-‘3A) reso­lution on the most sensitive range, to 2A. The Model 619

ohms measurement range is from 2k (O.lfl resolution) to 2T.
The volts measurement range is from 200mV (IpV reso­lution to ZOOV. The Model 619 is capable of 0.0005%

resolution. It can be interfaced to any programmable
measurement system utilizing the IEEE-488 Interface bus.

(See Figures 2-1 and 2-2 for front and rear panel detail.)

1.2 FEATURES

The Model 619 includes the following features:

l Resolution of 4% or 5% is standard with the Model 619.

Resolution of 3% is available only when programmed

through the IEEE-488 bus.

l The IEEE-488 Interface option (Model 6193) enables the

Model 619 to be incorporated into a measurement system

that utilizes programmed control through the IEEE-488

bus.

l The modular construction concept allows for future

developement of a line of interfaceable products.

l Whenever two Model 6194 Electrometer Modules are in-

stalled, there are two separate input channels. Channels
A and B measure separately through the READ command
and they are separately switched into the AID Converter.

Channel B is an option.

l Ratio A/B takes a ratio of the two channels, always

dividing A by B.

l Difference A-B subtracts the electrometer value of Chan-

nel B from Channel A.

l A beeper sounds whenever a front panel push-button

switch command is given. The beeper is enabled by

Switch 1 on the Isolator Board.

l The Model 6191 Guarded Adapter, in the guarded switch

position, reduces the effect of additional input cable

capacitance (see paragraph 2.2).

1.3 WARRANTY INFORMATION

The Model 619 and its installed options can be returned to

Keithley for repair and calibration. Also, the Model 619 op­tions (Models 6191, 6193, 6194 and 7008) can be returned
to the factory without the basic Model 619. Information for
returning the Model 619 and/or its options is given on the
inside front cover of this instruction manual.

1.4 MANUAL ADDENDA
Improvements or changes to this manual will be explained

on an addendum attached to the inside back cover.

1.5 SAFETY SYMBOLS AND TERMS
Safety symbols used in this manual are as follows:

The symbol

A

on the instrument denotes that

the user should refer to the operating instructions.
The symbol

IOOOV or more may be present on the terminal(s.1.

‘t

on the instrument denotes that

The WARNING used in this manual explains dangers that

could result in personal injury or death.

The CAUTION used in this manual explains hazards that

could damage the instrument.

1.6 UNPACKING AND INSPECTION
The Model 619 was carefully inspected both mechanically

and electrically before shipment. Upon receiving the Model
619, unpack all items from the shipping container and check
for any obvious damage which may have occured during
transit. Report any damage to the shipping agent. Retain
and use the original packaging materials if reshipment is re­quired. The following items are shipped with all Model 619
orders:

l Model 619 Electrometer/Multimeter with one Model 6194

Electrometer Module and one Model 6011 Triax Input

Cable.
Model 619 Instruction Manual.
Installed or separate optional accessories per request.
Warranty Card(s).

Warranty information is given on the inside front cover of
this instruction manual. If there is a need to exercise the
warranty, contact the Keithley representative in your area to
determine the proper action to be taken. Keithley maintains
service facilities in the United Kingdom and West Germany,
as well as in the United States. Check the inside front cover
of this manual for addresses.

7 SPECIFICATIONS .;

For Model 619 detailed specifications, refer to specifications

that precede this section.

l-l/l-Z

SECTION 2

OPERATION

2.1 INTRODUCTION
This section contains information concerning unpacking, in-

sepection, initiil use and operation of the Model 619.

2.2 PREPARATION FOR USE
The Model 619 is shipped ready for use on the line voltage

marked on its rear panel. The beeper is programmed to be
operational, and if the Model 6193 IEEE-488 Output is in­stalled, it will be set to the Addressable mode, binary
address 6 ~001101.

NOTE

The following procedure can be used to
either confirm the factory setting or to set up
the instrument for other modes of operation.

2.3 PRE-POWER UP PROGRAMMING
The top cover of the Model 619 must be removed to check

or change the LINE VOLTAGE, LINE FREQUENCY, and

BEEPER switches. To remove the top cover, refer to Sec-

tion 6 Maintenance.

2.4 POWER UP
During power up, all LED annunciators, other than seven-

segment displays, will momentarily light indicating they are
functioning properly, and the Model 619 will go to the
default conditions given in paragraph 2.27.

During power up, the Model 619 will do a RAM test using
test patterns. If the RAM test fails, the bad chip will be in­dicated by a blinking annunciator as follows.

LOW
High
LOW
High

During power up, the Model 619 will do a cyclic redundance

check (CRC) on its PROM memory. If PROM test fails, it will

be indicated by blinking annunciators as follows:

During power up the Model 619 displays the current soft-

wars revision level and line frequency selected as follows:

Frequency
Designation: F60 for 60 Hz

BYTE
BYTE
BYTE
BYTE

CHANNEL, CH 9, RATIO, DIFF

LOW lk RAM
LOW lk RAM
High lk RAM U922 RATIO
High lk RAM

F50 for 50 Hz

u919 CH.A
U920 CH.6

U923 DIFF

(All Blinking)

Current Software
Revision Level: C-2

c-2

During power up, the Model 619 will check the operation of

each module in the unit as follows:

1. If Channel A is not present or malfunctions, “no ch-A”
will be displayed.

2. If Channel 6 is not present or malfunctions, “no ch-6”
will be displayed.

3. If the FilterlMux or A/D are either not present or they

malfunction,

4. If the Isolator is not present or malfunctions, “no ISO”
will be displayed.

During operation, the Isolator is doing error
checking on data going across the Isolator.

In sending data, if after eight retries the data is not sent cor­rectly a “SND E” will occur and the transmission is attsmp­ted again eight more times. This process continues until the
data is correct.

In receiving data, if after sight retries the data is not received
correctly, “REC E” will occur and the reception isattempted
agin eight more times. This process continues until the data
is correct.

2.5 BEEPER SELECTION

When a button is depressed and the Model 619 circuitry
recognizes it, the beeper will sound momentarily. Illegal
conditions not recognized by error messages will not beep
(i.e., highest range and uprangel.

The beeper is programmed to be operational at the factory;
however, it can be disabled if so desired. To disable the
beeper, refer to Section 6 Maintenance.

2.6 TALK ONLY MODE/ADDRESSABLE MODE
SELECTION (see Figure 2-l)

If the Model 6193 IEEE-488 Output is installed, it will be fac­tory set to the Addressable mode at binary address 6. When
in the Addressable mode, RATIO A/B and DIFFERENCE
A-B are disabled. A different address can be selected by set­ting switches Al through A5 of 5701 and putting the Model
619 through the power up cycle (see Note). The switches
permit five-bit binary selection of addresses 0 to 31.

The Talk Only mode can be selected by setting switch 7 to
the closed 10) position and putting the Model 619 through
the power up cycle lses Note). When in the Talk Only
mode, the address switches are disabled. In this mode the
TALK ONLY and TALK LED’s will light.

“no A-d” will be displayed.

NOTE

2-1

NOTE

In order for the Model 619 to accept an ad­dress or mode change, the instrument must

go through the power up cycle. If the Model
619 is already on, turn it OFF and then back
to ON.

2.7 READING RATE SELECTION

When the Model 619 is in the Front Panel mode and the 5%
digit re$olution mode, two different reading rates can be
chosen via 55 (2.41 rdg/sec) or SE (0.30 rdg/sec). See
Table 2-6. To select the 55 reading rate, refer to Section 6
Maintenance.

2.8 OPERATING INSTRUCTIONS

Table 2-l. Maximum Input

Range
200mV. 2V

Maximum Input

250V RMS, DC to
60Hz sineware

ZnA, 20nA. 200nA
2pA. 20pA. 200pA

ZmA, 20mA
2A

250V RMS, DC to
60Hz sineware

250V RMS, DC to

60Hz sineware,

Fuse Protected

2kn. 20kQ. 200kn
2Mfl. ZOMR, 200M11

ZGO, ZOGQ, 200Gn
2TD

250V RMS, DC to
60Hz sineware

The basic operating instructions for the Model 619 are
outlined in the following paragraphs, Variations and more
complicated measurements will be described later in this
section.

1. The Model 619 is provided with a three-wire line cord
which mates with third-wire grounded receptacles.

WARNING

Ground the instrument through a pro­perly earth-grounded receptacle before
operation. Failure to ground the instru­ment can result in severe injury or death
in the avant of short circuit or malfunc-

tion. In addition, connect only to the

line voltage selected. Application of
incorrect voltage can damage the in-

strument.

2. Turn on the power by depressing the ON/OFF push but­ton in the lower left-hand corner of the front panel (see

Figure 2.2). Allow one hour for warm up. An additional
hour may be required for temperature extremes. Note
that the rear panel power switch must also be in the ON
position.

3. Upon power up, the Model 619 will go to the default con­ditions and a beeper will sound for approximately two
seconds, The selected frequency and software revision
level will also be momentarily displayed. To change any
of the default conditions, refer to paragraph 2.27. Input
connectors are located on the rear panel of the Model
6194 Electrometer Module. The main input is in the triax
connector, with a separate input for the 2 Amp range. An
Analog Output is provided for convenience on a DIN con-

nector (refer to Figure Z-21. Connect the measurement
source to the input terminals and make the desired
measurement. See Table 2-l for maximum input.

2.9 FRONT PANEL FUNCTIONS

The Model 619 Front Panel has two funCtiOnal groups. an
Annunciator and Display Group and a Function Saiectqr

Group. See Figure 2-2.

2.9.1 Annunciator and Display Group

The software or manually selected status of the Model 619
may be determined at any time by looking at the Annun­ciators. There are four Annunciator Groups; Status Blocks
A, B, C and D.

1. Status Block A indicates the channel status as either
Channel A, Channel B, Ratio A/B, or Difference A-B.

2. Status Block B indicates the status of other functions in­cluding,

Zero Check, Suppression, Auto Range, Filter,

Trigger, Update, and External Feedback.

,3. Status Block C indicates the IEEE-488 bus status as

Remote, Listen, Talk, SRQ, Binary, Talk Only, or LLO.

4. Status Block D indicates the measurement; Volts, Amps,
or Ohms.

The E-Digit Display next to Status Block D indicates the
measured value, power, and sign of the input to the Model
619 ElectrometeriMultimeter. In addition to these Status
Blocks, status may also be determined by controller sampl­ing through the IEEE-488 bus.

2.9.2 Function Selector Group

The Function Selector Group consists of seven blocks; Dual

Channel including Ratio and Difference, Volts-Amps-Ohms,
Range Selection, Zero Controls, Baseline Controls, Filter,

and Resolution.

NOTE

Note that all front panel operations describ­ed below, except Ratio and Difference, may
be programmed or controlled from the
IEEE-488 bus using the optional Model 6193
Interface. In Remote (or Manuall mode, the
Model 619 front panel selector push-button
switches are active unless LLO is command­ed through the bus.

2-3

2.9.3 Dual Channel
Whenever the Model 619 has a second Model 6194 Elec-

trometer Module installed, Channel A or B may be selected
from the front panel or bus. The two channels are indepen­dent so that they operate as two separate instruments and

can be separately programmed.

1. Channel A
A. Upon power up of the Model 619, CHANNEL A will be

displayed in the Channel Status Block.

B. Otherwise, depressing the CHANNEL A push button

will:

(a) Display CHANNEL A data.
lb) Light the CHANNEL A annunciator.

2. Channel B
A. Depressing the CHANNEL B push button will:

(a) Display CHANNEL B data.
(b) Light the CHANNEL B annunciator.

B. If there is no Channel B installed in the Model 619,

depressing the CHANNEL B push button will:

la) Display the error message “no ch-b.”
(b) ReIeit-: the Model 619 to the previous operating

3. Ratio A/B and Difference A-B. In any Function or Range
the Ratio or Difference between Channel A and B, from

10-1s to IOf’s, may be calculated and displayed.

NOTE

The Model 6193 IEEE-488 Interface must be

in the Talk Only mode or else not installed

for Ratio and Difference operations.

1. Light the DIFFERENCE A-B annunciator.

2. Take one reading at 4.8rdglsec rate on Channel
A.

3. Take one reading at 4.8rdglsec rate on Channel

B.

4. Compute the difference.

5. Display the difference at a 2.4rdg/sec rate, with
a 5%.digit resolution.

6. Repeat the above seauence.

(c) If there is no Channel B installed, depressing the

DIFFERENCE A-B push button will:

1, Display the error message “no ch-b.”

2. Return to the previous operating mode.

NOTE

Observe that the largest value that can be
displayed in the Ratio or Difference mode is

1999.99 x 10’s. The smallest value that can
be displayed is 0.00000 x 10-1s. Any time a

division by zero is attempted, the display
message is “OFLO” (overflow). The data
used internally by the Model 619 is to a
higher resolution than the displayed reading.

Therefore, a display of all zeros on Channel

B will not necessarily result in a RATIO

“OFLO.”

2.9.4 Volts, Amps, and Ohms
Volts, Amps.

or

Ohms functions may be manually selected
for a wide range of measurements. Programmed or soft­ware selected may also be obtained through the IEEE-488

Interface bus.

A. Ratio A/B

(a) If the Model 819 is in the Addressable mode, the

RATIO A/B command is locked out and cannot be
selected.

(b) Otherwise, when the RATIO A/B push button is

depressed the Model 619 will:

1. Light RATIO A/B annunciator.

2. Take one reading at 4.8rdglsec rate on Channel
A.

3. Take one reading at 4.8rdg/sec rate on Channel

B.

4. Compute the ratio.

5. Display the ratio at 2.4rdg/sec rate with 5% digit
resolution.

6. Repeat the above sequence.

(c) If there is no Channel B installed. deoressing the

RATIO A/B push button will:

1. Display the error message “no ch-b.”

2. Return to the previous operating mode.

B. Difference A-B

(a) If the Model 619 is in the Addressable mode, this

command is locked out and cannot be selected.

(b) Otherwise, when the DIFFERENCE A-B push but-

ton is depressed the Model 619 will:

NOTE

In resistance and voltage modes, analog out­put is noninverted and can be used for

guarding.

I. Volts

A. Upon oower up the Model 619 will go to the Volts

function.

B. If the Model 619 is in the Ratio A/B or the Difference

A-B mode, this command is locked out and cannot be
selected.

C. Otherwise, selecting the Volts function for the

rently displayed channel will:
(a) Light the VOLTS annunciator.
(b) Program the Electrometer for the Volts function.

2. Amps
A. If the Model 619 is in the Ratio A/B or the Difference

A-B mode, this command is locked out.

B. Otherwise, selecting the Amps function for the cur-

rently displayed channel will:
(a) Light the AMPS annunciator.
(b) Program the Electrometer for the Amps function.

cur-

2-4

3.

Ohms
A. If the Model 619 is in the Ratio A/B or the Difference

A-B mode, this command is locked out.

B. Otherwise, selecting the Ohms function for the cur-

rently displayed channel will:
(a) Light the OHMS annunciator.
(b) Program the Electrometer for the Ohms function.

2.9.5 Range Selection

1. Auto/Manual
A. Auto or manual range may be selected by pressing

the appropriate front panel button or by programming
on the Interface bus.

8. If the Model 619 is in the Ratio A/B or the Difference

A-B mode, this commend is locked out.

C. If the channel currently being displayed is in AUTO

RANGE. deoressina the AUTO/MANUAL oush but­ton will:’ ­(a) Turn off the AUTO RANGE annunciator.
(b) Place Model 619 into Manual Ranging.

(4 Then hold the present range.

D. If the channel currently being displayed is in Manual

Ranging, depressing the AUTO/MANUAL push but­ton will:

(al Light the AUTO RANGE annunciator.

(b) Begin Auto Ranging.

(cl Hold the previously displayed reading until settled

range is found, then display it.

E. The following ranges cannot be accessed in the Auto

Range mode and actuation of Auto/Manual in any of
these function range combinations will result in an
error display of “noAU”:

(a) 2 Amp Range. This range requires a separate

input.
(b) External Feedback (Amps Function).
(4 2G Ohm through 2T Ohm Range. These high

resistances require long time constants.

2. Uprange/Downrange. Manual ranges are advanced up or
down by pressing the appropriate front panel button. The
desired range may also be programmed on the Interface
bus.
A. Uprange

(a) If either RATIO A/B or DIFFERENCE A-8 is

selected, this command is locked out and cannot
be accomplished.

(b) If the channel currently being displayed is in

AUTO RANGE, depressing the UPRANGE button
will place the Model 619 is Manual Ranging and

advance Uprange one step.

(c) If the channel currently being displayed is in

MANUAL RANGE, depressing the UPRANGE
push button will advance Uprange one step.

(d) If the channel currently being displayed is in

MANUAL RANGE and on the highest possible
range for that function, depressing the UPRANGE
push button will be ineffective.

B. Downrange. Downrange operates in the same manner

as Uprange.

C. External Feedback. External Feedback is accessible on

Amps function by touching or programming

UPRANGE on the 2 Amp range.
(a) If the displayed channel is in AMPS and Range 20

(range above the 2 Amp range), the Model 619

will:

1. Place the Electrometer in the Ext Feedback
mode.

2. Light the EXT FEEDBACK annunciator.

(b) All status which were in effect for Range 8 in

AMPS are in effect for EXT FEEDBACK.

(c) Refer to Table 2-2for measurements which can be

made on the Amps function by programming or
touching UPRANGE beyond the 2 Amp range.

NOTE

When using a resistive feedback configura-

tion either linear (resistor) or non-linear (log
diode junction) additional parallel capaci­tance will be required for stable opertion.
See External Feedback Use, paragraph 2.10,
also see Keithley App. note #IO1 “Using the

619 External Feedback.”
Analog output will invert in the Amps func-

tion, but will not in Volts of Ohms functions.

Output levels and gain are given in full

specifications.

(d) The AID Converter inverts and displays Vout on

the 2 Volt range.

Table 2-2. External Feedback Measurements

Connect these components

In Order to Meawn

between the Input and Analog
Output

Capacitor

V,,t = -Q/C

Logarithmic Currents

Log Diode

V O,,t= -lK Log I + constant)

Current Gains

2.9.6 Zero Controls

Non-Decade Resistors, R

=-IR

V

wt

!

When there is voltage offset which must be compensated in

making precision measurements, this compensation is
automatic using the ZERO CORRECT push button (or by In­terface bus command). Compensation corrects for offsets
on ranges within the selected channel and function.

2-5

1. Zero Check
A. If the displayed Channel (A or B) is not currently in

ZERO CHECK, depressing the ZERO CHECK push

button will:
(a) Program the Electrometer to Zero Check.
(b) Light the ZERO CHECK annunciator.

B. If the displayed Channel (A or B) is currently in ZERO

CHECK, depress the ZERO CHECK push button, and

the Model 619 will:

(al Turn off ZERO CHECK annunciator.
(b) Program the Electrometer out of Zero Check.

C. If the displayed channel is in AMPS, Range 9,

depressing the ZERO CHECK push button will display
the error message “no 2AC” (no Zero Check in 2 Amp

range).

2. Zero Correct

A. If either RATIO A/B or DIFFERENCE A-B is selected,

this command is locked out and cannot be
accomplished.

8. If the Model 619 is not in ZERO CHECK or is 2 Amp
current range, depressing the ZERO CORRECT push
button will:
(a) Display the error message “corr IL”
(b) Then return to the previous operating mode.

C. If the Model 619 is in ZERO CHECK, depressing the

ZERO CORRECT push button will:
(a) Disable the filter.

(b) Put the AID Converter in times 10 gain mode and

in a 16.66msec integration period.
(cl Average 2 conversions.
(d) Take a reading with the Electrometer attenuator in

- 1 and then - 10.
(a) Solve for Electrometer and A/D offsets.
(f) Repeat above steps for IOOms integration time

period.

(g) Return to previous operating mode in Zero Check,

compensating for all internal voltage offsets

measured during Steps a through f.

2.9.7 Baseline Controls

(a) Store the current reading in the Baseline register

assigned to the currently displayed Channel/Func­tion. There are six Baseline registers: Channel
A/Volts, Channel A/Amps, Channel A/Ohms,

Channel B/Volts, Channel B/Amps, and Channel

B/Ohms.

fb) If in Baseline Suppression mode, take unit out of

Baseline Suooression. which will turn off the
BASELINE SUPPRESSION annunciator.

fc) Return to previous operating mode (except

Baseline Suppression).

2. Baseline Suppression
A. If either RATIO A/B or DIFFERENCE A-B is selected,

this command is locked out.

If the Model 619 is not currently in the Baseline
Suppression mode, depressing the BASELINE SUP­PRESSION push button will:
(a) Light the BASELINE SUPPRESSION annunciator.
tb) Subtract from display the contents of the ap-

propriate Channel/Function Baseline register
(e.g., if 0.10 volts is stored in the Channel B/Volts
Baseline register, subtract 0.10 Volts from
readings on all Channel B voltage ranges).

If the Model 619 is currently in the Baseline Suppres-

sion mode, depressing the BASELINE SUPPRES-

SION push button will:
Ia) Take unit out of Baseline Suppression.
lb) Turn off the BASELINE SUPPRESSION annun-

ciator.

WARNING

If the Model 619 is in the 200 Volt range
and in Basline Suppression, the

BASELINE SUPPRESSION annunciator
will blink indicating a safety warning. A
dangerous voltage level could exist and
still be read es a lower voltage as
displayed by the instrument. This could
present a shock hazard should the

operator misinterpret the measurement

relative to actual voltage.

Baseline Controls assist in making relative measurements es
referenced to a known value (leakage, operating
parameters, etc.). The Model 619 will subtract this amount
on all ranges on the particular channel where a baseline is
assigned.

WARNING

The Suppression light will blink on the
200 Volt range, indicating e possible

high voltage safety hazard.

1. Baseline Store
A. If either RATIO A/B or DIFFERENCE A-B is selected,

or the instrument is currently displaying “OFLO,” this
command is locked out and cannot be accomplished.

B. Otherwise, depressing the BASELINE STORE push

button will:

2-6

2.9.8 Filter

When the Filter is placed in operation, by pressing the

FILTER push button or commanding it through the
IEEE-488 Interface bus, an additional 25dB of line frequency

rejection filtering is applied.

1. If either RATIO A/B or DIFFERENCE A-B is selected, this
command is locked out.

2. If the displayed channel is not currently in the Filter
mode, depress the FILTER push button and the Model

619 will:

A. switch the Filter in.
B. Light the FILTER annunciator.

3. If the displayed channel is currently in the Filter mode,
depressing the FILTER push button will:
A. Switch the Filter out.
B. Turn off FILTER annunciator.

2.9.9 Resolution

Pressing the RESOLUTION push button provides an extra

decade of sensitivity and resolution. This may also be ac-

complished, by command, on the IEEE-488 Interface bus.

NOTE

For example, the 2nA range, in Resolution,
will go from 4% digit, 100Fa. Isd, to 5%
digit, 1OfA Isd resolution. Noise is typically a
few digits in the fifth place.

1. If either RATIO A/B or DIFFERENCE A-B is selected, this
command is locked out.

2. If the Model 619 is currently displaying the 4% digits,
depressing the RESOLUTION push button will:
A. Reduce the reading rate to 2.4rdg/sec.

B. Increase the display resolution to 5% digits.

3. If the Model 619 is currently displaying 5% digits,
depressing the RESOLUTION push button will:
A. Increase the reading rate to 5,49rdg/sec.

B. Reduce the display resolution to 4% digits.

2.9.10 Current Ranges, Common Input

Whenver a common input is required, which would include
the 2 Amp range, the following triax adapter may be utiliz­ed. In this instance, a single input is used and an external
relay connects the 2 Amp current range shunt to the triax in­put connector on the Model 6194 Electrometer Module. See
Figure 2-3.

A 5 Volt control signal, external to the Model 619 Elec­trometer/ Multimeter must be supplied to switch the relay
to the 2 Amp current range. Any additional leakage current
introduced by the relay can be nulled using the BASELINE
STORE/BASELINE SUPPRESS feature.

WARNING

Care should be exercised in shielding
the input from any extraneous pickup.
Additonally, if a high common mode
voltage is required, the entire circuit
should be shielded by the chassis

ground to prevent a potential shock
hazard.

NOTE
Displayed exponents are multiples of three
(0, *3, i6, *12, *15, *181. The Resolu-

tion feature increases only the resolution of

the displayed reading.

I- -

I

I

INPUT COMMON >

CHASSIS GROUND >

*-

+

. \

,

I

------

I

&

CONTROL

2.10 EXTERNAL FEEDBACK USE

The external feedback current range provides a varied and
extensive additional measurement capability to the Model
619 Electrometer/Multimeter. Among these are charge,
logarithmic currents, and non-decade current gains.

1

PlOO

I

I

I
I

TRIAX
INPUT

I

I

6194

2 AMP

INPUT

RYlOO

5100: KEITHLEY es-253

(POMONA #358Ol

PlOO: KEITHLEY CS-141

(SPECIALTY CONNECTOR CO. #3OP-100.11

FlYlOO: KEITHLEY AL-51 (5V-500)

Figure 2-3. Common Input Current Range

2-7

The input circuitry used in the Model 6194 Electrometer in
the Amps function is configured in the feedback Amps
mode as illustrated in Figure 2-4. An input currant applied at
the negative input of the op amp is nulled with a current
through the parallel combination of R,, ,and C,, from the
output of the op amp. This is accomplrshed by the high
open-loop gain (typically greater than 40,000) of the op amp
which holds its negative input at virtual ground (its positive
input which is connected to input common). R,, in parallel
with C,, converts the input current to a voltage which is fur­ther processed by the AID Converter in the Model 619.

Included in this processing is a reinversion of the signal
polarity to match that of the actual input.

parallel combination of the two quantities separated by
this symbol (AlI B)=AB/fA + Bl).

5. Selection of the external feedback network must incor­porate the proper frequency compensation required by
the Model 6194 Electrometer Module.

6. All external feedback circuitry should be housed in a
suitably shielded enclosure. Insulators supporting the in­put node (input HII should be constructed of Teflon@

or

other high quality insulator.

2.10.1 External Trigger

When the Model 619 is turned on it is in the continuous
mode To. When switch S3 (Figure 6-1, Isolator Board) is
switched to ON and the, Resolution button is pressed the
Model 619 is placed into the one shot mode Tl. The Tl
mode allows a trigger only from the front panel by pressing
the Ratio/Difference button or by the External Trigger.

The external trigger requires a falling edge pulse at TTL logic
levels. The trigger voltage should be between, greater than
Or equal to zero, and less than or equal to + 5 volts. The ex­ternal trigger pulse initiates a measurement conversion, For
one shot (Tl, T3 and T5) times (trigger to first byte) refer to
Table 2-8. For continuous ITO, T2 and T4) times refer to

Table 2-7.

Figure 2-4. Model 6194 Electrometer Input Circuitry

The availability of the analog output permits the user to

substitute an external network for the combination of
R ,and C,,. In effectively applying the capability, a number
o F factors must be taken into account.

1. The total absolute value current supplied by the analog
output for both feedback to the input and monitoring of

the analog output must be less than 22mA.

2. The Model 619 processes the Model 6194 Electrometer
output as a i2.OOOOVDC f *2.00000VDC in the 5%
digit mode) signal correctly inverting the polarity for an
accurate representation of the input signal polarity. This
output voltage is the level impressed across the external

feedback network.

3. Accuracy of the response is the same as that for the 2
Volt range, excluding the contribution of all user-supplied
external feedback circuitry. Noise and NMRR will also be
a function of this external circuitry.

4. Input impedance is given by the relationship
z - 0.5MD 11 (Z /A ), where ZFB is the external feed­b!!ckietwork and xv is”tha open-loop gain of the op amp
(typically greater than 40,000). Note that in Zero Check,
A” is reduced to unit” Ill and that /I represents the

NOTE
The external trigger is inhibited in the SO
mode or by LLO (local lockout).

Electrometer Complete-The Electrometer Complete output
is a 400~s~ wide positive pulse that signifies completion of
the measurement conversion cycle. The Electrometer Com­plete line can be used to trigger another instrument or to in-

form an instrument that the measurement conversion cycle

has been completed.
For example: The Model 619 can be used with a scanner.

The Electrometer Complete line can trigger the scanner to

switch to the next available channel when the Model 619
measurement cycle has been completed.

2.10.2 Charge

The measurement of charge can be made directly by using
an external feedback capacitor, C,,, as illustrated in Figure
2-6. In the relationship Cl= CV, Q= charge (coulombs) ap­plied to input, C=capacitance (farads) of Cr. and
V= voltage (volts) at output as indicated on the display. The
Model 619 display will read charge directly in the units deter­mined by C. For example, using IpF capacitor will provide a
display in pC.

In practice, C,, should be greater than 1OOpF for feedback

stability and of a suitable dielectric material to ensure low

leakage and low dielectric absorption. Polystyrene and

2-g

polypropylene dielectric capacitors offer good performance
in this regard.

As shown in Figure 2-5 an external Zero Check contact may
be desirable in certain applications where 0.5MQ Zero Check
input impedance cannot be tolerated. R,,,,, protects this
contact from the discharge surge of C, Care should be ax
ercised in the selection of this contact switch or relay) that

a

the high impedance, low current requirements of the cir­cuitry are not compromised.

From this equation, proper selection of transistor 01 (Figure
2-6) would require a device with a high current gain (h,,)
which is maintained war a wide range of emitter currents.
Suitable devices include Analog Devices AD812 and Preci­sion Monolithics MAT-Ql.

Frequency compensation/stabilization is accomplished by
C,,. Selection of a proper value depends on the particular
transistor being used and the maximum current level an­ticipated. Compensation at the maximum current is required
since the dynamic impedance of the transistor will be a
minimum at this point. It should be noted that the response
speed at lower currents will be compromised due to the in­creasing dynamic impedance.

Z (impedance) = 2V/21= kT/ql=O.O26/1 @25OC

Using the MAT-01 or AD818, a minimum RC time constant
of 50@ec at maximum input current should be used. At
I,,(maxl of 100/1A, this would correspond to 0.2pF. Note
that at lOOnA, this would increase the RC response time
constant to 50msec (5sec at InAl. A minimum capacitance
of IOOpF is recommended.

Figure 2-5. Charge Measurement

2.10.3 Logarithmic Currents
The use of a diode junction in the external feedback path

permits a logarithmic current-to-voltage conversion. This
relationship for a junction diode can be given by the
equation:

V=m kT/q In (I/lol+lR,

where q = unit charge (1.6022x10-‘90, k= Boltzmann’s

constant ~1.3806x10-*~J/°Kl, and T= Temperature (OK).

The limitations in this equation center on the factors I,,, m,
and Rs. lo is the extrapolated current for V=O. An empirical

proportional constant, m, accounts for the different
character of currant conduction (i.e. recombination and

diffusion) mechanisms within the j&ion, typically varying

in value between 1 and 2. Finally, R, constitutes the ohmic
bulk resistance of the diode junction material. lo and Rs limit

the usefulness of the junction diode as a log converter at

low and high currants, respectively. The factor m introduces
non-linearities between these two extremes. With all these

factors taken into account, most diodes have a limited range

of useful logarithmic behavior.

A solution to these constraints is the use of a transistor con­figured as a “transdiode” in the feedback path as shown in

Figure 2-6. Analyzing the transistor in this configuration
leads to the relationship:

V= kT/qllnl/lo-In (h&(1 + h,,)ll

where H,, is the current gain of the transistor.

Although the input to this configuration is a current source,
a voltage source can be used with a suitable ballast resistor.
In this configuration, the input burden of ImV must be con­sidered as an error s~ource against the input voltage.

Further processing of the response can be accomplished
with Baseline Suppression and Ratio. Baseline Suppression
provides an offset and Ratio provides a scaling factor (with
optional Channel B, Model 6194 Electrometer Module in­stalledl. Alternately, a controller (computer) can process the
data via the IEEE-488 bus output (with optional Model 6193
IEEE Interface installed).

Figure 2-6. Logarithmic Current Measurement

2.11 NON-DECADE CURRENT GAINS
The Model 6194 Electrometer uses internal decade

resistance feedback networks for the 2nA through 20mA
currant ranges. In some applications a non-decade current­to-voltage conversion (gain) may be desirable. As illustrated
in Figure 2-7 a calibratable resistance, R,,, serves this pur­lXXe.

2-9

not in the remote mode, the first arguments preceding
the remote mode will not program the Model 619 and will
cause “NO rN” to be displayed. The Model 619 front

panel push-button switches will respond unless LLO is
commanded through the bus. Pressing the RATIO button

initiates a conversion(s) if a trigger is being awaited by
the Model 619 (the RATIO button is a manual trigger dur-

ing bus operation). After programming, the front panel
does not reflect the new configuration until the Model
619 is triggered.

Table 2-4. Secondary Address

Figure 2-7. Non-Decade Current Gain Measurement

Limitations on the value of R,, require it to be in the range
of 102n to 10’00. Frequency compensation/stabilization is
accomplished by C,,. Selection of C,, based on an RC

response time should be per Table 2-3 with a minimum value
of IOOpF:

TABLE 2-3 C,, SELECTION

2.12 SYSTEM OPERATION (Using the Model 6193
IEEE-488 Interface)

2.13 ADDRESS SELECTION

1. Primary Address. The Primary Address of the Model 619
is selected by 5 switches on the IEEE-488 module (see
Figure 2-l). These switches are accessible from the rear
panel of the unit. This allows the selection of 31 primary
listener/talker address pairs. Binary 11111 is reserved for
the Untalk and Unlisten commands.

2. Secondary Address. The Model 619 uses a secondary
addressing to distinguish between SRQ requests, com­mands and data associated with input Channel A and in­put Channel B. To address the Model 619, the IEEE-488
controller must send the primary address of the Model
619 followed by the secondary address of the desired
channel. See Table 2-4 for secondary addresses.

2.14 BUS MANAGEMENT LINES

FUNCTION

Channel A (LISTEN)

ASCII HEX

a

1

;;”

Channel A (TALK)
Channel B (LISTEN)
Channel B (TALK1
SRQ (TALK)
Status Request A (TALK)
Status Request El (TALK) ii 64;

i 62;
b

f 3

63H

-I

2. Interface Clear (IFC). Clears the Interface and goes to
talker/listener idle states. There are no state (function,
range, etc.) changes in the Model 619.

3. Service Request (SRQ). Requests serial poll service.

4. End (EOII. Asserted during last byte of multi-byte data
transfer.

5. Attention (ATN). Asserted when address or commands
are present on the bus.

2.14.1 Bus Commands Implemented

1. Universal Commands
A. Device Clear (DCL). The Model 619 goes to default

conditions (see paragraph 2.27)

B. Local Lock Out (LLOI. If LLO is given, the front panel

controls cannot cause a change in status in the Model

619. (The LLO annunciator will light when in LLO).

C. Serial Poll Disable (SPD). Disables serial polling.

D. Serial Poll Enable (SPE). When addressed to Talk, the

Model 619 will send the SRQ status word.

E. Untalk (UNTI. Puts the Model 619 into a talker idle

state if it was a talker.

F. Unlisten (UNLI. Puts the Model 619 into a listener idle

state if it was a listener.

1. Remote Enable (REN). To place the Model 619 into the
remote mode, send REN and the appropriate listen ad-

dress and the remote indicator will light. The statement

used to enter the remote mode (i.e. REN end Address)
must not contain any other commands. The Model 619
must be in the remote mode to be programmed. If it is

2-10

2. Address Commands
A. Selected Device Clear (SDC). If the Model 619 is ad-

dressed to listen it will go to default conditions.

B. Group Execute Trigger (GET). If the Model 619 is ad-

dressed to listen and in the proper trigger mode (T2 or
T3). it will automatically trigger a conversion.

2.14.2 Input Channel Control (Secondary Address is a
or bl

1. Channel. Input Channels A and B can be separately ad-

dressed and controlled using secondary addressing. Each
input channel has several internal status words which
define the current operating status of the channel. When

addressed to Talk, the status words define the function,

range, and mode of operation by which the data will be
accepted. The status words can be modified by the

following device dependent commands sent via the bus

(see Status Section). In order to program Channel A or
Channel 8 the machine must be in Remote mode.

2. Device Dependent Commands. The following device
dependent commands apply to either Channel A or
Channel B as defined by the secondary address. Any or
all may be used followed by an execute command “X” to

inititate the change. Only after the execute command
will the change take place. Commands may also be sent
in sections, for example:

First Commands Send Fl

Second Command Send R2X
The above commands are the same as sending Fl R2X in
one command.
A. Function and Range. Refer to Tables 2-5 and 2-6 for

function and range information.

B Bus Response Mode

(a) Mg Standard. On error or data, the Model 619 will

not access SRQ (status byte will still contain up-

to-date information if serial poll done).

(b) Ml Interrupt. On error or data, the Model 619 will

access SRQ when appropriate.

(c) Pwr ON/DCL/SDC, Default Mid.

C. Trigger Mode (same for both Channels A and B)

(a) T@ Continuous on Talk. The Model 619 con-

tinuously updates the display at the programmed’
reading rate after being address to Talk. The out­put data buffer will be updated at the same rate as

the display if the data is read out at the same rate.

If the data is not read out, the reading will be held
in the output data buffer until it is read out. When
it is read out, the next value will then be placed in
the buffer.

(b) Tl One-Shot on Talk. The Model 619 will update

the output data buffer at the programmed rate,
once each time a conversion is initiated by being
addressed to Talk (to retrigger, address to Talk
again) (see Figure 2-B).

(c)

T2 Continuous on GET. The same as Continuous
on Talk except it is done on GET (see Figure 2-B).

(d) T3 One-Shot on GET. After a GET command is ac-

cepted by the Model 619, it will initiate a conver­sion. The Model 619 will update the output data

buffer once at the oroarammed reading

rate (see

Figure 2-B).

(a) T4 Continuous on X. The same as Continuous on

Talk except it is done on X (see Figure 2-B).

(fl T5 One-Shot on X. After an “X” command is

accepted by the Model 619, it will initiate a conver­sion. The Model 619 will then update the output
data buffer once at the programmed reading rate

(see Figure 2-81.

(g) Pwr ON/DCL/SDC, Default T@.

Table 2-5. Function

I

Power ON/DCL/SDC, Default F@

Table 2-6. Range

Volts

Auto

200mV
2v
2ov
2oov

*2oov

l

2oov

l

2oov

*2oov

2oov

l

2oov

__­IN/DC

Amps
Auto

2nA
20nA
200nA

W
20fiA
2OOfiA

2mA
20mA

l

2Amps

**EXT FEEDBACK

I

SDC, Default R4

Ohms

Auto
2k
20k
200k
2M
20M
200M
“2G
“20G
200G
“2T

*Will not autorange into these ranges
**EXT FEEDBACK is considered to be an Amps range and

not an individual function.

2.15 DATA FORMAT

1. D@ ASCII Data String. The internal Model 619 priorities
are such that ASCII data is passed to the interface after the
display is updated (same for Channels A and 6).

2. Dl Binary Data String. The internal Model 619 priorities

are such that Binary data is passed to the interface before
going to the display. The display will be blank except for
bus annunciators.

2.16 ASCII FORMAT

Channels A and B can be separately addressed to talk using
secondary addresses a and b. When the Model 619 is ad­dressed to Talk, it will transmit the current contents of its
output data buffer as a 16 to 18 byte ASCII string. The ac­tual length of the ASCII string depends

on

the

number

of
programmed terminators. Refer to Figures 2-9 and 2.10 and
Tables 2-7 through 2.9.

2.17 BINARY FORMAT (Refer to Figure 2-11)

1. In the binary data mode, the Binary annunciator will turn
ON and the display becomes blank except for the bus an-

nunciators.

2-11

Figure 2-8. Timing Diagram

Table 2-7. Continuous Time (Typical1 in Milliseconds

RATE

SO
Sl
S2
S3

s4

s5

t) in m*ec 1

I

SO

Sl -

I

s3 I

54 - SE

L

Figure 2-9. Start of Signal Integrate from Trigger Itl)

(Trigger is a negative going pulse.)

Table 2-8. One Shot Times ITypical) in Milliseconds I%,,)

I

I

* ATNxto DAVX

** ATN

to SRQ

5 7L

z-13

2. Byte 1: (Refer to Figure 2-10)
A. Sign Bit - 1 = negative, 0 = positive

B. Overflow Bit 1 =overflow
C. Data bits Most significant 6 bits of absolute value

binary data.

3. Byte 2,3: 16-bit binary data.

4. Byte 4: 2’s complement binary representation of decimal

exponent.

5. Binary Format is not available in “Talk Only” mode.

6. Binarv Format is not defined for secondary channels C

Bus Line EOl is asserted during transmission
of the last byte (Dummy byte).

2.18 PROGRAMMABLE TERMINATOR

1, The Model 619 utilizes the ASCII Code for terminating

data transfer, see Table 2.10. The Model 619 is program-

med with a CR LF terminator that is designated as Y (LFI
when sent over the bus.

Table 2-9. Operating Function Format

2. However, a different terminator can be programmed into
the Model 619. Example: To use A as a terminator, pro-

gram Y IA) to be sent over the bus. Reserved letters are
not usable as terminators.

3. No terminator is used if a Y (DEL) is Sent over the bus.
The EOI will identify the last byte of the data transfer.

4. On power up of the instrument, the default condition

puts the Model 619 back into the CR LF terminator mode.

2.19 BUFFER READINGS Wnne for both Channels

A and Bl

Data Storage Buffer commands for buffer contents are

shown in Table 2-11.

Q(ASCII): The (ASCII) byte contains an ASCII number from

0 to 5. This number will allow l-50 readings ‘7” to be stored

going in groups of 10 readings.
I, (ASCII) = 1 says that ‘7” equals 10 readings (i.e., 01

says that “T” equals 10 readings).

FUNCTION DATA

Volts

Amps
Ohms

Ratio**
Difference**

““Availble in “Talk Only” operation only.
*N = Normal Reading

0 = Overflow Reading

*NDVC * 1. 2 3 4 5 6 E f 0 9 (Terminators)
NDCA i- 1. 2 3 4 5 6 E + 0 9 (Terminators)
NOHM + 1. 2 3 4 5 6 E + 0 9 (Terminators)
NRAT f 1. 2 3 4 5 6 E f 0 9 (Terminators)
NDIF + 1. 2 3 4 5 6 E f 0 9 (Terminators)

Figure 2-10. Binary Format

7

2-14

2. Default is (ASCII=@ or “T” equals 1 reading (i.e., Qa
says that “T” equals 1 reading).

3. To empty the buffer, read “T” readings or reprogram
(i.e., give an “X”).

4. Data storage buffer must be filled up to the programmed
length (multiple of 10 up to 501 before any data is
transmitted on the bus. Format is first in, first out. An
“X” command clears the buffer.

5. In Ml, which is a Bus Response Mode, when the buffer is

full it will generate an SRQ (see SRQ Status Byte Format,

paragraph 2-29).

6. Cannot use buffer with T5 which is one of six Trigger
modes. In the T5 Trigger mode each time an “X” is given,

the Model 619 will update the output data buffer and then
clear it; therefore, it will never fill up. This will work with
T4 Trigger mode since in this mode only one “X” is need­ed (see Table 2-12).

7. If the Model 619 is in a one-shot Trigger mode, there will

be no reading until the buffer is filled up. Therefore, it will
take multiple triggers to fill the buffer.

Table 2-10. Data Terminators

except reserved letters

E.R.M.T.D.Q.Y.S.P.~.N.U.X

Pwr ONIDCLISDC Default Y ( LF)
Note: <CR, =QD,

<LF> =OA,

Table 2-11. Data Storage Buffer Commands

1 Pwr ON/DCL/SDC 1 Default Q@

Table 2-12. Typical Trigger Time to First Byte Time

Change

Function

Range
Channel

42

Integration
':y 1 ;;'

48

2.20 MEASUREMENT TIME

The time required to make a measurement is the sum of:

1. Control or command time to the Electrometer or
measurement source.

2. The analog settling time. This is specified to 0.1% set­tling. All time constants are roughly first order.

3. The time from trigger to first byte available.
A. This time is specified for various resolutions.

B. In addition, time must be added if the conversion is

the first on a new range or function, see Table 2-12

for conversion times.

4. Time to transmit data over the bus.
A. In ASCII data format, 16 to 18 bytes are to ba

transmitted (4 in binary mode).

B. Time is determined mainly by the controller.

I

C. The Model 619 can transmit data as fast as 57~s per

byte. However, in the SO mode, a 6ms delay occurs

with each string.

D. If the controller waits more than 5.2msec before

obtaining the next byte, the Model 619 may delay

completion of the bus handshake by up to 3ms.

3
3

s0

msec
msec
msec

msec

Sl

3

msec

3

msec

42

msec

114 msec

1

2-15

2.21 READING RATE MODES (See Table Z-13)
The Integration period is measured in milliseconds. Signal

zero and calibrate integration periods are equal. When one

of the measurement modes is triggered, the A/D will signal
integrate, autozero and autocalibrate. The A/D will do a
new autozero and autocalibrate if there is time to do them
and another trigger is not given.

There are 6 Zero Correct registers (channel and function
dependent)-ch A V, ch A A, ch AR, ch B V, ch B A, and
ch B Q. After power up each register has a$ in it, To Zero
Correct select the desired channel and function (lowest
range) and perform the correction. After correction is done,
the machine reverts back to the Zv mode (no need to pro­gram 20 after 21 -the Model 619 does it automatically.

i.25 BASELINE STORE

The 2 is autozero; C is autocalibrate: S is signal integrate.
The trigger is indicated by a single quotation mark (‘1. The
data is ready signified by double quotation marks (“I.

The delays are measured in milliseconds. The IEEE bus has
approximately 5.2msec to take a reading once data is
available. If the reading is not taken in this time, the retrig-

ger rate will be slowed down and will miss the reading in the
continuous mode.

Integration periods for Sl, 52, and S3 are for 60Hz line
operation. These are changed to 20msec integration periods
for 50Hz. For measurement mode SS, 50/60Hz integration
period is 4.lmsec. Switch 801.Sl on the Isolator board con­figures A/D timing appropriate for 50/60Hz.

Following a range change or channel changes, two addi­tional integration periods are required for update of zero and
calibration.

At sufficiently high trigger rates, autozero and autocalibrate

phases are bypassed. When a trigger is given the A/D will

do a signal integrate and then autozero and autocalibrate. If

the trigger is given before it can autozero and autocalibrate,
it will do a signal integrate. Therefore, if trigger is given at a
faster rate, autozero and autocalibrate will be bypassed.

In the Aameasurement modes, the front panel push-button
switches will not respond. The LLO annunciator will turn on
and the display goes blank except for the bus annunciators.

2.22 FILTER

1. P&The filter is disabled.

2. PI -The filter is enabled.

3. Pwr ON/DCL/SDC, default P!d.

2.23 ZERO CHECK
Each channel has either Zero Check ON or OFF (not

tion dependent, just channel dependent).

1. C&The Model 619 is not in Zero Check.

2. Cl -The Model 619 is in Zero Check.

3. Pwr ON/DCL/SDC, default Cl.

2.24 ZERO CORRECT

1. Z&-Zero Correct table is not updated.

2. 21 -Update Zero Correct table.

3. Pwr ON/DCL/SDC, default 20.

1. N&Contents of baseline registers are not updated.

2. Nl- Baseline registers are updated, then it returns to N$
mode.

3. Pwr ON/DCL/SDC, default N$.

There are 6 Baseline Store registers (channel and function
dependent 1~ ch A V, ch A A, ch A 0, ch B V and ch B RI.
After power up, each register has a 0 in it. To store select
the desired channel and function, and perform the storage.
The value stored will be used as the correction to the

reading when Baseline Suppression is given.

2.26 BASELINE SUPPRESSION

1. U&The contents of any Baseline register will not be
subtracted from the reading.

2. Ul -Subtract contents of appropriate Baseline register

from reading.

3. Pwr ON/DCL/SDC, default U@.
NOTE

For Zero Check, Zero Correct, Baseline
Store and Baseline Suppress, a trigger must
be provided to complete these commands.
For example if in “Tl” mode, giving ZlX will
only set the Model 619 up to do a Zero Cor­rect, The Model 619 will need to be address­ed to talk (since in Tl) to complete the com­mand.

2.27 DEFAULT CONDITIONS

When an SDC or DCL, Channels A and B will go to the
following default conditions:

F@ - Volts
R4 - 200V Range
MB - Bus Response Mode (Standard)
T0 Trigger Mode (Continuous on Talk)
D@ Data Format (ASCII Data String)
Y(LF)- Programmable Terminator (CR)(LF)
S3 - Measurement Mode
P,$ - Filter (Filter Out)
Cl -Zero Check (In Zero Check)
Z# Zero Correct (No update of Zero Correct table)
Ng - Baseline Store (No update of contents in the Baseline

register)

V!Zi - Baseline Suppression (Do not subtract contents of any

Baseline register from reading)

Channel A will be displayed.

2-16

Table 2-13. Reading Rate Modes

Continuous

rdglsec

(ASCII)

40

21.2

10.7

5.49

4.83

2.41

1.20

0.60

0.30

0.15

:onversion:

C

i

Averaged

t

1

1
2
4

1
2
4
8

16

ntegration Data1

kriod (a,dl :esolutior

4.1 3%

16.66 4%

16.66 4%

16.66 4%
100 5%
100 5%
100 5%
100 5%
100 5%
100 5%

Thus resolution is always 5% digits.

*Must allow ZC time for analog specs.

**In mSec f250&x

***Available in front panel operation via Resolution pushbutton.

rrigger to First**
Byte Delay k,e)

ECII

DO

31.5

34.5
80

168
119

328

741
1680
3300
6700

164 IZ.C;*Z;C...T.;Z;S,C,S,Z,Y

112 z,c,*z,c...‘s”
323 Z,C,*Z,C,...S,Z,S”
736 Z,C,*Z,C...“S,Z,S,C,S,Z,S”

1680 z.c.*z.c...‘s.z.s.c.s.z.s”.s..
3300 z;c;*z;c...s;z;s;c;s;z;s~~;s..
6700 Z,C,*Z,C...‘S,Z,S,C,S,Z,S”,S..

Sequence

. ..s”cs”c...
. ..s”cszs”c...
. ..s”cszscszs”c..
. ..s”cszscszs”c..
. ..s”cszscszs”c..
. ..s”cszscszs”c..

.s”cszscszs”c..
. ..s”cszscszs”c..
~..s”cszscszs”c..

-

On power up the Model 619 will default to the above condi­tions. In addition, the Zero Correct table and Baseline

registers are cleared. Also if the software Watch Dog
detects a processing error the instrument is placed
automatically in these default conditions.

2.28 TALK-ONLY MODE

The sequence of commands after the secondary address

and prior to execute is unimportant except that Baseline
Store cannot be in the same line as function or channel
change ISBS error (see SRQ status byte formats).

All commands are executed after “X” is given. Only com­mands that you wish to change need to be programmed.

The Model 619 may be used with a printer or other

nonintelligent devices through the IEEE Bus in Talk-Only
mode. This particular mode is selected by SW7 on the

IEEE-488 module. (See the sketch regarding SW7). In the
Talk-Only mode, ASCII data is sent continuously out to the
interface. The front panel will default to these conditions

M@, Tfl, 00, Y(LF). All other device dependent commands

(function, range, reading rate, filter, etc.) are selected via
the front panel pushbutton. Ratio and difference may be
sent in Talk-Only mode, by not in Addressable mode. See

Figure 2-l. Address switch A6 is not used as a primary ad­dress switch.

NOTE

In Addressable mode, the following front
panel push buttons are non-functional
(Commands are locked out):

l RATIO (Only available in Talk-Only mode).
l DIFFERENCE (Only available in Talk-Only mode).

Programming Example (Channel A, Using H.P. 9820 Desk

Top Computer Codes).

Let Model 619 primary address = 6 (Binary 00110).

? Unlisten
A Talk Address of Controller
6 Primary Address of Model 619

Secondary Address of Channel A
+
!$ Continuous on Talk

Model 619 will not access SRO on error or data

0

F
1 Amps
R
4 lOOnA Range
S
3 6.25 Readings/Second

2.29 SRQ STATUS BYTE FORMAT

If an invalid command is given, no change in status will
occur. If in the Ml response mode, service will be re­quested, and the error will be indicated in the SRQ byte.
Extensive error checking is done during programming of the
Model 619. The errors can be classified into two types;
Pre”Execute” errors and Post”Execute” errors.

1. Examples of Pre”Execute” errors:
A. VX = IddC

8. V2X = IddC
C. ggX = IddC
D. Fggg = IddC (must see and X to accept next com-

mand string)

E. F4X = IddCO

2. Examples of Post”Execute” errors:
Do a ZO when not in Zero Check (CO).

3. Status Byte (see Figure 2-l 1).

4. Error Codes (D106= 1, error; see Table 2-14)

5. Data Codes (D106-0, nonerror; see Table 2-15)

2.30 MACHINE STATUS (Secondary Addresses
c and d)

The Model 619 can be addressed to give its current machine
status. To get the current status of Channel A, send (Talk
Address) secondary address c. To get the current status of
Channel B, send (Talk Address) secondary address d.

Figure 2-12 and Table 2-16 and 2-17 define each byte of in­formation. QO must be in effect when reading machine
status.

NOTE

If SRQ is not read within 1OOms after “SPE
and Talk address,”

the Model 619 resets to

default conditions.

Filter Out (disabled)

ii

0” ASCII Data String
X Execute (This character terminates the command

string and causes their execution).

2-18

IMS BIT)

DlOS

0 l/O

D107

D106

l/O

Figure 2-12. Machine Status

Ill05

X

1 =ERROR CONDITION

O=NORMAL CONDITION

D104

110 l/O 110

D103

D102

(LS BIT)

DlOl

l/O

“Hex Code

0

1

2

3
4
5
6
7
8

*D104 through UWI

I

__^.

*D104 through DlOl

Table 2-14. Error Codas

Meaning

ILLEGAL DEVICE DEPENDENT Command

ILLEGAL DEVICE DEPENDENT Command Option
Attempt to PROGRAM when not in remote
No zerc check with 2 AMP
No zero check with zero correct
Spare
No autoranging in this range
Spare
Invalid string with baseline store

NOTE

Data Codes 10106-O. nonerror) (see Table

2-16).

Table 2-16. Data Codes

‘Hex Code

0

1
2
4
5

Meaning

Normal
OVERFLOW
DIFFERENCE
RATIO
Buffer Full

Display

OFLO

._

Display

IddC
IddCO
no rn
no 2AC
Corr Il.
noPu

ISbS

2-19

3yp2 0 Zero correct

:hA: 0 = Zero Correct off (20)

1 = Zero correct on (Zl)

Table~2-16. Byte Definitions

1 = Filter on (Pl)

:hB: Same as chA

%yte 2 Zero Check

:hA: 0 = Zero Check off (C0)

1 = Zero Check on (Cl)

:h 8: Sane as chA

lye 4 IRange

:hA: 0 = Autorange

1 = Range 1 (Rl)
2 = Range 2 (RZ)
3 = Range 3 (R3)
4 = Range 4 (R4)

5

= Range 5 (R5)

6 = Range 6 (R6)

7 = Range 7 (R7)
0 = Range 8 (RG)
9 = Range 9 (R9]

: = Range lO(R:)

chB: Same as chA

Byt_E 3 Function

chA: 0 = Volts (F0)

1 = Amps (Fl)
2 = Ohms (F2)

chB: Sam as chA

Rytc 5

chA: 0 = Non SRQ (M0)

chB:

Mode

1 =

SRO (Ml)

Same as chA

2-20

:hB:

lyte 6 Rate Type

:hA: 0 = Rate (SO)

:hB: Same as chA

Same as chA

1 =

Rate (Sl)

2

= Rate (S2)

3

= Rate (S3)

4

= Rate (54)

5

= Rate (S5)

6 = Rate (S6)

7

= Rate (S7)

8

= Rate (SR)

9 = Rate (S9)

Byte 7 Data

chA: 0 = ASCII (O0)

1 = Binary (Dl)

chR:

Same as chA

i

Byte 8

Triqger

I-

chA: 0 = Continuous on Talk (T0)

1 = One-Shot on Talk (Tl)

2

= Continuous an Get (TZ)

3 = One-Shot an Get (T3)

4

= Continuous on X (74)

5

= One-Shot on X (T5)

ch8: Same as chA

Byte

10

I

~~~

chA: 0 = Suppress off (UD)

Baseline Suppress

1 = suppress on (U0)

Table 2-16. Byte Definitions ICont.)

Dyte 9 Baseline Store

chA: 0 = No Store (N0)

chB: Same as chA

Byte

chA: 0 = Non-Autorangc

1 = Store Readinq (Nl)

11

Auto Ranqr

7 = nutoranqc

chl3 Same as chA

Byte 12 Int Period

chA: 4 = 16.66ms

5 = 4.1ms

8 = 20m

II = IflOms

chA: Same as chA chll: Same as chA

Byte 14

chA: 50/60HZ

0 = 60Hr

? = 5Ollr

chB: Ruffer State

1 = Ruffer no readings (00)

: = Buffer 10 readinqs (01)

4

= Ruffer 20 readings (42)
) = Buffer 30 readings (43)
8 = Buffer 40 readings (04)

2

= Buffer 50 readings (45)

chR:

Rytr 13 Terminator

ch A 7 = Y (OiL)

Eytc 15

chA: 0 = 1

chR: Same as chA

Sanr as chA

= = Y (CR)

: = Y (LF)

No. Readings to AVE,

I =2
2=4
3 = R
4 = 16
5 = 32

I

2-2112-22

SECTION 3

ACCESSORIES

3.1 INTRODUCTION

Section 3 lists the optional modules and accessories

available for installation in, or use with, the Model 619

Electrometer/Multimeter.

3.2 MODEL 6191 GUARDED ADAPTER

The Model 6191 Adapter is an outboard option for use with
the Model 6194 Electrometer Module. It reduces effective
cable capacity by driving the inner shield of triaxial cable at
guard potential and thereby reduces time constants due to

high source resistances when measuring volts and ohms. By

reducing the additional effective cable capacitance to
approximately 2pF. it permits measurements from high im­pedance sources. (See Figure 3-1 .I

The Adapter OUTPUT connects directly to the Model 6194

Electrometer Module INPUT shielded connector. Guard
potential is obtained from the Model 6194 Analog Output.

The Adapter’s INPUT is connected to the measurement.
l-he unit is switch selectable for guarded or unguarded
operation. In the guarded mods of operation the outside
conductor of the input connector is at input common as op­posed to power line ground for the “unguarded” mode.

Note that the Adapter will reduce the input common mode
voltage to a maximum of 30V RMS at DC to 60Hz. Also, a

10% isolation resistance can be placed in series with the

input by removal of an internal jumper. This is for use in

measurement of voltage sources which cannot tolerate the

Model 6194’s 500kOinput impedance in “zero check”

operation.

3.3 MODEL 6193 IEEE STANDARD 488 OUTPUT

The Model 6193 is an IEEE Standard 488 Bus Interface. It
permits the Model 619 to interface with any measurement
system utilizing the IEEE Standard Bus. The primary 5.bit
address is selected by five switches on the rear panel of the
Model 6193. This allows the selection of 31 primary listen or
talk address pairs. Binary 31 (11111) is reserved for the Un­talk and Unlisten commands. The five rear panel switches
are set at the factory for a primary address of binary 6
(00110). The literature pertaining to the Model 6193
assumes that binary 6 is the primary address. (See Figure

3-2.)

Interface specifications (including line commands,
parameters and response time) are provided in the detailed

specifications which precede Section 1. Address modes or
Addressable (ADDR) or Talk Only are also switchable on the
rear panel of the Model 6193 module.

The Model 6193 was designed to be an interrupt driven I/O

device, The board uses the Motorola 68488 IEEE chip which
is capable of performing all IEEE Talker/Listener protocols.
Along with the 68488 IEEE chip, it also contains Motorola

3448A IEEE bus transceivers, which are capable of driving
and/or terminating the IEEE bus lines per the IEEE specifica­tions. See Model 7008 IEEE-488 Digital Cable (paragraph

3.71 for cable interconnect.

Figure 3-l. Model 6191 Guarded Adapter

Figure 3-2. Model 6193 IEEE Standard 488 Output

3-1

3.4 Model 6194 Electrometer Module

The Model 6194 is an Electromete Module that has three
functions -Volts, Ohms and Amps. It is an input module for
the Model 619 Electrometer/Multimeter. Addition of a se-

cond Model 6194 provides dual channel capability with ind­pendent ranges and functions as well as ratio and difference
capabilities. (See Figure 3-3.)

The Module structure consists of two printed circuit boards

mounted on a common rear panel. The inputs and analog
output of the Modal 6194 are located on its rear panel. The
oower and control inputs are obtained through the Model
PC edge connectors plugged into the Model 619.

All Model 6194 Electrometer Module functions and ranges
are programmed over the analog bus. Converted into its
various measurement configurations, the Model 6194 Elec­trometer Module processes an input measurement to a
200mV or 2V signal which is in turn processed further by the
AID Converter module and the Filter/Mu% module.

adjustment openings that are marked to facilitate making
the calibration alignments. (See Figure 3-4). The extender
cards allow easy access to the individual boarding for
troubleshooting purposes.

Figure 3-3. Model 6194 Electrometer Module

3.6 MODEL 6195 MAINTENANCE KIT

The Model 6195 is a maintenance kit for the Model 619.
The calibration cover is installed in place of the normal

Model 619 top cover during calibration. It allows the Model

619 to reach normat internal operating temperature and has

1

Figure 3-4. Model 6196 Maintenance Kit

3-2

3.6 MODEL 6199 RACK MOUNTING KIT WITH
CHASSIS SLIDES

The Model 6199 is a rack mounting kit for the Model 619. It

provides the necessary hardware to mount the Model 619 in

a 5% inch (140 millimeter) rack height. The chassis slide

permits the unit to be pulled forward, the top cover remov-

ed, and internal adjustments or changes in configuration to

be made. (See Figure 3-5.)

3.7 MODEL 7006 IEEE-466 DIGITAL CABLE

The Model 7008 is a six foot (two meter) IEEE-488 digital

cable. The cable has 24 stranded wire conductors and is ter­minated with IEEE Standard 488 connectors. This will con­nect the Model 6193 to any IEEE Standard 488 connectors.

3.6 MODEL 6011 TRIAX INPUT CABLE

The Model 6011 is a four foot (1% meter1 low noise triax
cable terminated with alligator clips at one end and a triax
connector at the other end. This is a supplied accessory
with the Model 6194 Electrometer Module. (See Figure3-6.1

Figure 3-5. Model 6199 Rack Mounting Kit with

Chassis Slides

Figure 3-6. Model 6011 Triax Input Cable

3-313-4

SECTION 4

PERFORMANCE VERIFICATION

4.1 INTRODUCTION

Performance verification is recommended upon receipt of
the instrument, to ensure that no damage or misadjustment
has occurred during transit. Verification may also be per­formed whenever the instrument’s accuracy is questioned
or following calibration.

NOTE

For instruments that are still under warranty
(less than 12 months since date of
shipment), and whose performance falls
outside specifications at any point, contact
your Keithley representative or the factory
immediately.

4.1.1 Required Test Equipment

The accuracy of the test equipment should be at least five
times better than the instrument specifications. The
minimum required accuracy ratings of the voltage, current,
and resistance sources are as follows:

I. Voltage sources:

A. 190mV to 1.9V .002%

B. 19v to 19ov .003%

2. current so”rces:
A. 1.9nA to 19nA .07%
B. 190nA to 1.9A .03%

3. Resistance sources:
A. 1.9kQ to 19kn .04%

B. 190kn to 1.9Mh2 .03%
C. 19Mn. 190MQ, 1.9G0 .07%
D. 19Gn - .2%
E.‘l90GO .8%

F. 1.5Tfl 2%

If the accuracy of the test equipment is not at least five
times better than the instrument specifications, additional
allowance must be made in the readings obtained.

4.1.2 Environmental Conditions

All measurements should be made at an ambient tempera-

ture within the range of 18’ to 28°C (65” to 82’FI and a

relative humidity of less than 70%.

4.2 MODEL 619 PERFORMANCE VERIFICATION

Use the following procedures to verify the basic accuracy of
the Model 619. If the instrument is out of specification at
any point, a complete calibration may be performed as

described in Section 6. However, if the instrument is still
under warranty, contact your Keithley representative or the
factory immediately.

NOTE

Performance verification should be perform­ed by qualified personnel using accurate test
equipment with current calibration and
traceability.

4.2.1 Initial Conditions

Before beginning the verification procedure the instrument
must meet the following conditions:

1. If the instrument has been subjected to extremes of
temperature, allow sufficient time for internal
temperature to reach normal operating environmental
conditions specified in paragraph 4.1.3. Typically, it
takes one hour to stabilize a unit that is 10°C (18’FI out
of the specified temperature range.

2. Turn on the Model 619 and allow it to warm up for one

hour.

WARNING

Some procedures require the use of
high voltage. Take care to prevent con­tact with high potential circuits which
could cause electrical shock resulting in
injury or death.

4.2.2 Voltage Verification

Place the instrument in Zero Check, Channel A, Volts,

1.

and Manual ranging.
Set the Model 619 to the 200mV range and apply

2.
+ 190,OOmV to the Channel A input. Zero correct the in-

strument and verify a display reading of 0.00 - 3 to
within f 1 count.

Release the Zero Check and verify a display reading of

3.
+ 190.00 -3 to within *6 counts.

Repeat steps 1 through 3 using negative voltage.

4.

Refer to Table 4-1 and repeat the above procedures for

5.

the remaining voltage ranges.

If an Electrometer is installed in Channel B, repeat steps

6.

1 through 5 for that channel.

4.2.3 Current Verification

1. Place the instrument in Zero Check, Channel A, Amps,
and Manual ranging.

4-l

2. Set the Model 619 to the 2nA range and apply 1.9000nA
to the Channel A input. Zero correct the display if
necessary.

3. Release the Zero Check and verify a display reading of

1.9000 -9 within f 59 counts.

4. Refer to Table 4-2 and repeat the above procedures for
the remaining current ranges.

5. If an Electrometer is also installed in Channel B, repeat
steps 1 through 4 for that channel.

7. For ohms sources greater than 200Mn the resistance
should be both guarded and shielded. The shield

prevents noise injection into the measurement and the
guard reduces response settling times (see Figure 4-2).
This can also be accomplished by using Model 8191

Guarded Adapter (see Figure 4-3).

Table 4-2. DC Current Performance Check

NOTE

For the 2OOpA through 20mA ranges, for

valid zero correction, input current must be

no greater than lOOpA. Zero correction does
not apply to the 2A range.

Table 4-I. DC Voltage Performance Check

Applied

Range

200mV
2v 1.9ooov
2ov 19.ooov 18.996 to 19.004 +o
200 19o.oov 189.98 to190.04 +o

*These display readings take into account the errors that
may be generated using the input sources listed in
paragraph 4.1.2.

4.2.4 Resistance Verification

1. Place the instrument in Zero Check, Channel A, Ohms,
and Manual ranging.

2. Set the Model 819 to 2kQ and apply 1.9000kQ to the in­put of Channel A. Zero Correct the display if necessary.

3. Release the Zero Check and verify a display reading of

1.9000 +3 within f 34 counts.

4. Refer to Table 4-3 and repeat the above procedures for
the remaining resistance ranges.

5. If an Electrometer is also installed in Channel B, repeat
steps 1 through 4 for that channel.

6. For ohms sources above 200kQ. the resistance element
should be shielded to prevent noise pickup, Refer to

Figure 4-l.

Voltage at lEO to 26OC

190.00mV

Allowable Readings

189.94 to 190.06

1.8997 to 1.9003 +o

*

-3

Applied

Current

1.9000nA

19.000nA

190.00nA

1.9000cA

19.OOO~A
19O.OO~A

1.9000mA

19.000mA

1.9000A

*These display readings take into account the possible er­rors that may generated using the input sources listed in
paragraph 4.1.2.

**When using the 2A range, the input must be applied to
the terminals designated as 2 AMPS MAX INPUT.

Table 4-3. Ohms Reference Check

Applied

Resistance

1.9000kQ

19.000kn

190.00kO

1.9000Mfl

19.000Mfl

190.00MQ

1.9000GO

19.000GO

190.00GO

1.5000TQ

*These display readings take into account the errors that
may be generated ,using the input sources listed in
paragraph 4.1.2.

!

Allowable Readinas
at 16O to 2PC

1.8966 to 1.9034

18.989 to 19.031

189.73

1.8976

18.943

189.46

1.8946

18.847

183.91

1.3800

to 190.27
to 1.9024
to 190.57
to 190.54
to 1.9054

to 1.9153

to 196.09

to 1.6200

-

l

+3
+3
+3
+6
+6
+6
+9
+9
+9
+ 1:

4-2

r----

(shield)

--

1 Trim Cable

Figure 4-1. Resistance Source Shielding

r-------1

(shield)

Figure 4-2. Resistance Source Shiadling and Guarding

&?“dl _ _

r ,:lWi- --, 1
I ;

' I
' I

I 1
I i-----l,
L-- -----.

Resistance Source

I 1

,In A

Lly I]

I

' I

Pi" 1 Unity Gain Analog

Pin 2 Output

Trim Cable

y --f Electrometer *"put

1”

6191 Guarded +

Input Adapter +,

Ezl

Guarded

>
' Electrometer Analog Output

out

TO 6194

TO 6194

Figure 4-3. Measuring Resistance Sources Using Modal 6191

4-314-4

SECTION 5

THEORY OF OPERATION

5.1 INTRODUCTION

This section contains functional and circuit descriptions Of
the component parts of the Model 619 and its related mod­ules and options. The following components are included:

l Power Supply, PC-515

. Electrometer Module, PC-522 and PC-523

l IEEE-488 Interface, PC-517

. CPU, PC-518

l Display/Keyboard, PC-514

. A/D Converter, PC-520
. Filter/Multiplexer, PC-521

The Model 619 is a versatile Electrometer/Multimeter in­tended for use independently or with programmed test and

measurement systems. Current sensitivity and input impe-

dance meet or exceed practical limits for most applications.

Figure 5-l provides an overall operational view. Section 7

COmainS

schematic diagrams to aid in understanding circuit

operation.

5.2 POWER SUPPLY

The Power Supply, shown in Figure 5-2, is mounted on the

cabinet left side (as viewed from the front) and consists of a
PC board, Shield (30450). and Rear Panel (30448). The
Rear Panel contains the line fuse, line cord plug, and a series
ON/OFF switch (S303). Refer to Schematic Diagram 30516
and 32004 in Section 7.

AC power is provided to the Model 619 by the line
plug/filter, P301. Transformer 301 and the fan receive
power through the series circuit of fuse F301, and switches
S303 and S304. F301 and S303 are located on the rear
panel of the power supply. Switch 5304, mounted, on the
instrument front panel, is connected to the power supply
through R303. The AC power is also applied to the trans­former, T301, through switches S301 and S302. These
switches permit transformer operation in four AC line
voltage ranges (refer to Table 5-l). The vent fan is powered
from the transformer primary through connector P302.
T301 acts as an autotransformer, setting the voltage level to
the fan.

Figure 5.1. Model 619 Block Diagram

6-l

The transformer secondaries are grouped to provide power
to the Model 619 digital end analog buses. The digital por­tion, which provides +9.5V unregulated, consists of a

bridge rectifier CR301, filter capacitors C302 and C303,
bleeder resistor R302, and a parallel network consisting of
R301 and C301. The R301 and C301 network makes digital
common electrically equal to power line (chassis) ground.

The unregulated DC voltage developed is connected to the

mother board digital bus J304.

4

6194 Electrometer Modules, When two are installed, the
one on the left (as viewed from the rear) is Channel A. The
second Model 6194 is Channel 6. Figure 5-3 provides an
overall view of the Electrometer Module.

The heart of the design is a bootstrapped op-amp with an
ultra-low input bias current, The input overload protection is
provided by a ballast resistance and by current limiting on
the bootstrapped output. This circuit can be arranged in two
versions,

1. In Amps the circuit is arranged as a current to voltage
converter. Various feedback resistances are used to
measure a wide range of input currents.

2. The circuit can also be arranged as a high input im­pedance unity-gain buffer which is utilized for both volts
and ohms measurements. When in the Ohms configu­ration,

a constant current source consisting of a
bootstrapped voltage reference and various feedback
resistances is used to convert an unknown resistance to a
measurable voltage level.

The input to the module is via a triax connector. Separate
binding posts and a microphone connector are provided for
the 2 Amp current range and analog output respectively. All
input/output connections, along with a fuse, are located on

the rear panel of the module. A calibrated resistive divider
couples the module output to the input of an AID Converter
at 200mV and 2V.

Figut ‘e 6-2. Power S

;“PPlY

The analog portion consists of bridge rectifiers CR303 and

CR302, filter capacitors C304 through C312, voltage
regulators VR301 through VR303 and voltage bleeder
resistors R303 through R305. The AC power, 33VAC. that
is used by the Electrometer modules, is obtained from the

winding that powers the fl5VDC rectifier, filter, and

regulator portions of this circuitry. The regulated voltage
potentials, of +5VDC and fl5VDC are provided to the
mother board analog bus through connector J305.

6.3 MODEL 6194 ELECTROMETER MODULE

The Electrometer Module is a three-function component

(volts, ohms, and amps). The module construction consists
of two PCS’s mounted together with a common rear panel.
All of the module functions and ranges are programmed
over the analog bus. In its various measurement configura­tions, the module processes an input measurement to an
output of 200mV, or 2V, which is further processed by the
AID Converter and Filter/Multiplexer.

A Model 619 instrument may contain one or two Model

Power is supplied to the module via a transformer isolated,
floating power supply. The logic for decoding and latching
system commends to the Electrometer module are shown in

the block diagram in Figure 5-3.

5.3.1 Theory of Operation for the Model 6194 Electro-

meter Module

NOTE

When reading through the theory of opera­tion for the Electrometer Module, refer to

Schematic Diagrams 305220 and 30523D.
located in Section 7.

The Power and Control inputs are obtained by plugging the

module P-C edge connectors into the appropriate connec-

tors on the Model 619 mother board (PC-516). This connec-

tor ties the module to the analog bus. Tables 5-5 and 5-6 are

the pin assignments for Channel A and S Electrometers

respectively. The input module identity is wired into the

mother board by transposing address lines A6 and Al be-

tween Channel A and Channel B locations on the mother

board.

5-2

>

2

MIP Input

>

>

Analog Output

L

2 N4P Fuse

2 AMPS

Figure 5-3. Electrometer Module Block Diagram

PC-522 (305220) contains the module power supply, out­put circuitry and 1 Amp current range shunt. The power

supply portion of the circuitry provides three basic voltage

levels for the module. It provides f260VDC (TP-1 and TP-2
to input common) which is used by the output circuitry
when configured in the Volts or Ohms functions. It also pro-

vides f8VDC (TP-3 and TP-4 to TP-6) for use by the output

circuitry when configured in the Amps function. This also

eliminates the necessity of the *26OV supply having to sup-

ply greater than 2mA. The *17VDC ITP-7 and TP-8 to
TP-9) bootstrapped supply is used by the input amplifier and

ohms reference on 30523D. The transformer (T601) in addi-

tion to providing the various voltage levels, serves to isolate

the module from other instrument voltage sources.
The center of the output circuitry is a bipolar totem pole ar-

rangement consisting of high voltage transistors Q601,
Q603, Q604, and Q602. Resistors R601, R606, R608, and

R602 bias their respective transistors to ensure that the
voltage burden is equally divided between the two tran­sistors at each end of the network. The network is current

notherboard Connections

biased by the voltage developed across CR615 through
CR618. CR615 through CR618 are essentially connected
across the totem pole arrangement. In the Amps function,
the contacts B and C of relay K602 short out R615 and
R617. This action increases the bias current level. The
bipolar networks consisting of 0605, Q606, CR620, CR619,
R613, and R615, limit the output current ranges. The top

ends of the high voltage “totem pole,” which are discon-

nected by contacts A and 8 of relay K601, prevent ex­cessive power from getting to this particular portion of the
circuitry. In this mode, input is supplied to Q603 and Q604

through CR605 and CR608. Capacitor C605 serves as

response stabilization in the Amps configuration. CR605
through CR608 have an additional function in disconnecting
the f8VDC supply (TP-3 and TP-4 to TP-6) from the circuit
when it is in the Volts or Ohms functions. CR602 and CR604
disconnect the entire output circuit from the f260VDC
supply during input voltage overload in either volts or ohms.
The drive to the output circuit is provided by the bootstrap-

ped amplifier U651 on PC-523 and via Pin 56 on the in­tramodule bus.

5-3

R607, R609, CR613, and CR614 provide extra drive current
to 0601 end Q602 when the circuit is operating near the

f 260V supply voltage levels. CR601 and CR603 protect the
emitter-base junctions of transistors 0601 and Q602 from
reverse voltage bias.

Controlling the configuration of the output circuitry arc :he

relays K601 and K602. These two relays are actuated by

R611, R610, Q607, end Q608 along with commutation
diodes CR623 end CR622. Control is provided via Pin 52 on
the intramodule bus from logic decoders on PC-523. K601
sets up the output for both Volts and Ohms functions pro­viding for a on-inverting gain. K602 sets up the output for
the Amps function by providing for an inverting gain con­version.

The remaining circuitry on PC-522 includes the 2 Amp cur-

rent range shunt resistance, R605. The 2 Amp range has

separate binding post inputs, J601 and J602, and fuse pro-

tection F601. Relay K603 along with commutation diode

CR621 selects this range for connection to the module out-

put. Control is provided from logic decoders on PC-523 via

Pin 52 on the intremodule bus. Fuse F601 provides overload

protection end is mounted for access on the rear panel of

the module.
The rest of the Electrometer module circuitry is located on

PC-523. The circuitry includes the following:
*Input Amplifier
*Feedback Networks
*Ohms Reference
*Bootstrapped Power Supply Regulators
*Module Output Attenuator
*Control Logic Decoders.

The input amplifier consists of a group of components:

R664, R665, R668, R667, R669, R656, C651, C658, C661,
K656, and U651. The heart of this section of the circuit is

the Electrometer operational amplifier, U651. Providing the
active forward gain portion of the Electrometer module, this

circuitry is combined with the feedback networks and
bootstrapped ohms voltage reference to provide amps and
ohms along with the basic volts measurements.

Potentiometer R656 is used to trim the input offset voltage

for U651 while R667 and C661 provide a pole/zero stabiliza­tion to this forward gain block of the module. R669 is the
pull-up resistor for the output circuitry on PC-522. R668
provides the input protection for U651 by limiting the input
current. C658 (along with R668) provides input stabilization
on Volts and Ohms functions. Relay K656 is the zero check
contact with R665 limiting the zero check input current.
R664 and C651 provide compensation for this extra input
resistance in the Amps function.

Five feedback networks are used in setting up the Elec­trometer module for both the Amps and Ohms functions.
Utilizing the inverting mode of the module output circuitry a
current to voltage converter is obtained.

A bootstrapped voltage reference develops a constant cur­rent source for use with the non-inverting module output
circuitry mode, for ohms measurements. The five networks

used are 100 ohms fR601, R6071, 1Okohms fR659, R6521,
1Mohm fR660, R653). lOOMohms fR662, R6541, and
lOGohms fR663, R655, R666). Potentiometers R651
through R655 permit calibration of five networks. Capaci­tors C652, C653, C656, C655, and C657 stabilize the feed­back response. Resistors R661 and R688 protect relay con­tact K657 form momentary current surges when capacitors
C653 and C656 are connected together. Connection of the
proper feedback network into the circuit is made by high
isolation impedance relays K651 through K654 end normal
isolation impedance relay K657. High isolation impedance
relay K655 provides a low resistance feedback network

which is used for amps zero check. Connection to the input

by relay K655 is made after R665, to limit the effect of the
realy contact resistance on the measured zero offset.

The ohms voltage reference consists of K658, K659,
VR653, U653, R676, R675, R672, R673, R670, R657, and
C662. The voltage reference is obtained from VR652; scaled
by R670, R672, and R673; and calibrated by R657. Op amp
U653 buffers the scaled voltage across R670 providing a low
output impedance to the feedback networks. C662 and
R675 serve to frequency compensate U653. R676 limits the
overload current on the output of U653. When VR653 is
switched in by relay K659, it limits the voltage across the
resistance being measured. The connection of the ohms ref­erence to the feedback networks is made via relay K658.

Power to ohms reference and the input amplifier is provided

by the power supply circuitry which consists of U652,
VR651, VR652, R674, R677, R671, C654, C659, and C660.
These bipolar voltage supplies are bootstrapped to the Elec­trometer module output in the volts end ohms configura­tions. The negative voltage I-VRI is provided by regulator
VR651. Positive voltage f +VR) is provided by U652 which
amplifies the reference zener (VI76521 voltage. Capacitors
C654, C659, and C666 provide the transient response pro­tection.

The parallel combination of R687 and C665 serves to limit
output current from U651 preventing excessive current
draw from U652 and subsequent latch up of the input cir­cuitry.

The module output attenuator provides a 2 Volt full scale

output to the AID Converter for those ranges and functions

which result in a 20V or 200V full scale analog output, This

portion of the circuitry consists of R679 through R683 end
relays K660 through K662. As mentioned previously, the

A/D Converter has two ranges of operation, 2V and 200mV
full scale. Potentiometers R679 and R680 calibrate the two
attenuation gains of 0.1 and 0.01. Relays K660 through

K662 select either the unscaled module output fK661) or the

output attenuator fK662) x 0.01 or x 0.1 fK660).

5-4

Resistors R686 and R678 are included to protect the Elec-

trometer module circuitry. Resistor R678 protects the

module from imposing a voltage potential from analog out-

put fJ652) common to module input fJ651) common.

Resistor R686 protects the module from transient voltage

input from the module output connection in the analog bus.
The remaining portion of the Model 6194 Electrometer cir-

cuitry is the Control Logic Decoder. This portion of the
module consists of U654 through U658, Q651, R685, C664,
end commutation diodes CR652 through CR663 and
CR664. U654 and U655 are octal D-type transparent latches
which store the appropriate data from control data inputs
end drive the module configuration relays. Data is clocked in
by decoding the module address through U656A and B.
Controlling the module requires “Function Byte” tU654l
and a “Range Byte” fU6551 which are latched with the ap­propriate address. These addresses and function/range
bytes are listed in Table 5-7. The identification or control
performed by each data bit in the function/range bytes is
listed in Table 5-8.

An acknowledge circuit, which consists of U656. R684, end
Q651, provides output to a wired NOR control line on the
“Analog Bus.” This serves to acknowledge the receipt of a
proper address by the module.

The section of circuitry consisting of U657C end D, R685,
CR664, and C664 performs a power up disable function.
The output of both latches U654 and U655 will be disabled
upon power up until receipt of a proper module function­byte address. This prevents a random (and erroneous) con­figuration of the Electrometer module by power up tran­sients. Additional logic prevents erroneous, simultaneous
actuation of relays which could result in damage to the
module.

Capacitors C666 through C668 prevent noise pickup and
subsequent erroneous relay actuatiOn.

5.4 MODEL 6193 IEEE-488 INTERFACE BOARD

The IEEE-488 Interface Board utilizes the Motorola 68488

IEEE IC which is capable of performing all IEEE
Talker/Listener protocols. The board was designed to be an
interrupt driven I/O device. The board contains Motorola
3448A IEEE bus transceivers, which are capable of driving
and terminating the IEEE bus lines per the IEEE-488
specifications.

A rear-panel accessible address switch is on the board for
choosing an IEEE Talk/Listener pair address for the Model

619. The IEEE connector is on the rear panel. An Interface
Bus Cable (Model 7008). six feet (2.meters) in length, is pro­vided with the Model 6193 module. The five-bit Interface
address is beck-panel selectable. The address switches are
preset, prior to shipment, to primary address of binary 6
fOOllO).

5.4.1 IEEE Interface Board Theory of Operation

NOTE

When reading the theory of operation for the

IEEE Interface Board, refer to associated
block diaarems end Schematic Diaaram
30518 for deference designations. -

The Model 6193 IEEE Interface is built around the Motorola
68488 IEEE LSI device U706. The 68488 is a Motorola 6800
family peripheral IC.

The PCB is buffered on data, address, and control lines to

present only a 1 bus load. U703 buffers all of the address
and control lines. BAB-BA2 make up the RSB-RS2 register
selects on the 68488. The 68488 has 16 registers of which 8
are read only and 8 are write only. The use of the R/W

(read/write) line allows access to the two 8 register banks.

See Table 5-l for Register Commands.

U707A end U708A decode All, A12, and IOEN to form
BDSEL (Board Select) tTP1). The BDSEL decoding will
place the PCB at memory space address 9608,-97FF This
allows 2k of address space for the 68488 of which tie first
16 bytes are used. U7078 inverts BDSEL to form BDSEL.
U708B decodes BDSEL, E, end R/W to DRVENB (Drive
Enable1 fTP2) which when high allows the inverting tri-state
data buffers U711 and U710 to drive the data bus.

U707C inms the R/W signal to form R/W. U708C
decodes R/W, BDSEL, and E to form REC ENB (Receive
Enable) fTP3) which when low allows the inverting tri-state
data buffers U711 and U710 to receive from the data bus.

The E signal (System + 2) is used in the decoding of U708B
and U708C to turn the buffers OFF when they are not driv­ing/sending, therby lowering their power consumption.

In the 68488 one of the 16 registers R4R is not present on

board the cmtself. When the chip decodes this register, it

generates ASE which is used to enable an external register

U709 onto the data bus. U709 is a tri-state buffer which is

tri-stated when ASE is high and drives the data lines when

-

ASE is low. The information on U709’s input is provided by

address switch S701, 5701 is located on the rear panel of

the Model 6193 IEEE-488 Interface Board. The necessary

pull up resistors for the switch bank are provided by the

thick film resistor network R701. The processor reads these

switches and then knows which Talker and Listener address

to assign to the 68488 chip, end thereby access the

instrument.

U702 end U705 are the data bus buffers for the IEEE bus.
U704 end U701 are the handshake and control buffers for
the IEEE bus. The buffers consist of four independent
driver/receiver pairs with bus termination resistors on
board. They also have the capability of either tri-state or

5-5

Table 5-I. Register Commands

RS2

-

0
0
0
0
0
0
0
0

1

1

1

1

iEi

-

0
0
0
0

1
1
1

1
0
0
0
0

RSO

-

R/W

__

0

0

1
1

0

0

1

1
0
0

1

1

REGISTER TITLE

1

Interrupt status

0

Interrupt Mask

1

Command Status

0

NOT USED

1

Address Status

0

Address Mode

1

Auxiliary Command

0

Auxiliary Command
Address Switch

1
0

Address

1

Serial Poll
Serial Poll

0

SYMBOI

ROR

ROW

RIR

_..

R2R

R2W

R3R

R3W

R4R

R4W

R5R

R5W

1

1

1

1

-

1
1
1

1

-

0
0

1

1

-

1

Command Pass-Through

0

Parallel Poll

1

Data In

0

-

Data Out

R6R

R6W

R7R

R7W

5-6

open collector operation depending on the bus requirement.

The Model 6193 is designed to use them in the open collec-

tor configuration. U707E. T/R2, and T/R1 form the control
for the bus buffers U701, U704, U705, and U702.

U702 and U705 data bus buffers are fully bi-directional as
indicated by the arrows on the schematic (305181. U701
Pins 3, 5, and 13 (which are NRFD, NDAC, and DAV
respectively) are also fully bi-directional. U704 Pin 11 lEOI)
is fully bi-directional. U707 Pin 11 (ATNI and U704 Pins 3
and 13 lREN and IFC respectively) are receive only and
U704 Pin 5 (SRQ) is send only. A typical section is shown in

Figure 5-4.

VR701 supplies the + 5 volt * 5% regulated power needed
by the PCB.

scratch-pad memory on board. With the 6840 LSI chip, the
CPU can have three hardware interval timers. It can support
both interrupt and DMA driven I/O systems. A 4MHz crystal
oscillator is used to provide all timing for the 6808 CPU chip
and digital system components. A partially decoded I/O
enable line (IOENI is provided for use by system I/O com-

ponents to ease their memory space decoding. The board is
capable of supporting signature analysis troubleshooting

techniques.

5.5.1 CPU Theory of Operation

NOTE

When reading through the theory of opera­tion for the CPU board, refer to Schematic

Diagram 30519 for reference designations.

5.5 CPU BOARD

The CPU board has a circuit which resets the processor
upon power up to ensure proper system operation. This cir­cuit can also be controlled via the watchdog line from one of
the interval timers in case of program malfunction. This
function will be discussed in more detail later in this section.
The CPU has provisions for 8K words of ROM (or EPROM)

program memory on board with decoding for an additional

8K ROM external. It also has provisions for up to 2K RAM

Pull

Up Enable

The Model 619 ElectrometerIMultimeter control processor
unit (CPU1 is constructed around the Motorola 8808 micro­processor (U905). This particular processor is a Motorola
6800 series processor with an internal clock.

The Motorola 6808 LSI microprocessor requires a 20msec

reset pulse when power is turned on to get its dynamic buf­fers and the clock running properly. This reset delay is pro­vided by timer U917. The output of U917 is inverted by

U916D and applied to the reset pin of the microprocessor

SW Send/Rex

PA. Enable

S/R L

Figure 5-4. Data Bus Buffer

I

Dir. Comn.

5-7

(Pin 401. It also goes to all other devices in the system which
require power up resets via bus Pin 28 (i.e., PIA’s, VIA’s,
etc.)

U913 is a Motorola 6840 timer peripheral. It is part of the
Motorola 6800 series family of parts. The 6840 KJ913)
contains three fully programmable hardware timers with in­terrupt and output capability. U916c is controlled by the
6840 (U913) software controllable timer 1, which monitors
the running software. U913 timer 3 is used to establish real
time interrupts to the running software. U913 timer 2 out­puts a 120Hz signal on Pin 3 ITPIZJ to allow oscilloscope
monitoring for determining whether the IC is functional.

U913 is an I/O device to the system, U902B decodes BA9,

BAlO, BAll, and BA12 to form one chip select for U913.
The other chip select for U913 is provided by BIOEN which
will be discussed later in this section. The memory space is
SE@+SFFF,, of which eight locations are used by the
chip. Placing U913 in the I/O configuration gives it added
flexibility in that it can be used by DMA (Direct Memory Ac­cess) devices or other I/O components if needed. See Table
5-2 for Register Commands.

The 6808 microprocessor data bus D&D7 is buffered and in­verted by U921 and U918 to form BDP)-BD7 and is provided
to the system. The unbuffered data bus is routed to all the

memory devices on the PC board. The control for data

transfer into the CPU is derived by 49038 (TP7). It decodes

+2, A15, A13, and R/W to form the RECENB (Receive

Enable) signal. The RECENB signal allows the buffer to
receive from the data bus. The control for data transfer into

the CPU is derived by U804C (TP61. It decodes R/W, BA,

E&I2 to form the DRVENB (Drive Enable) signal. The
DRVENB signal allows the buffer to drive the data bus.

Decoded +2 is used for all of the buffers in order to make

them G-state for reduction in power consumption.

The 6808 address bus A$A15 is buffered by U908 and

U901 to form BAQ -BA15 which is provided to the system.
To aid I/O device decoding in the system BA13, BA14,
BA15, and BVUA are decoded by U909C. 8, A, and U902A
to form the IOEN II/O Enable) signal. This signal is buffered
by U911 to form BIOEN. In addition to IOEN, U911 does all

RS2 RSI RSO

0 0 0

0 0 0

1

0 0

0 0

0 1 0

0 1 0

0 1 1

0 1 1

1 0 0

1 0 0

1 0 1 1 0 1
1 1 1 0 1 0
1 1 1 1

1

1 1

Table 5-2. Register Commands

I

R/W6= 0

CR2=0 Write #3
CR1 = 1 Write #3
Write Control

Register #I

Write MSB

Register

Write Timer #I

Latch
Write MSB

Register

Write Timer #2 Write

Latch
Write MSB

Register

Writer Timer #3

Latch

I

I

R/W=1

NOP
NOP

Read Status

Register

Read Timer #I

counter

Read LSB

Register

Read Timer #2

counter

Read LSB

Register

Read Timer #3

counter

Read LSB

Read LSB

Register

I

5-8

the control line buffering; it buffers I, R/W, VMA (to form

BVUA) and BBA/DMAGNT (Direct Memory Access Grant)

for use by the Model 619 System.
All on board ROM memory decoding is done by U914A.

U903A, U904A, U912, and U91OB. U903A and U904Aform
the ROME (ROM Enable) signal. This enables U914A, the 2
or 4 decoder to select the appropriate daivce based on Al 1
(Pin 21 and Al2 (Pin 3) of U914. The 6808 requires vectors

from memory to branch to various sections of software.

These vectors must appear in locations FFFB,.FFFF, in the
memory space.

The Vector JAM signal allows the top block of ROM tc be

double address for this purpose. The top block responds to
FFF8 -FFFF, as well as its normal address. U912D and

d perform the necessary “0R”ing function. Therefore,

DSEL4 (TP4) decodes memory spaces B8@,-BFFF and
E@@@,-FFFF,. Signal DSELl ITP3) decodes A8&,-F,
memory space, ROM U924. Signal DSEL2 (TP21 decodes

ABgB,-AFFF, memory space, ROM U915. Signal DSEW

(TPl) decodes B&&B7FF, memory space, ROM U907.
The above process is used for 2716 memorY~s. Refer
to Table 5-3 for selection of PROMS. DSEW selects
A@@,-AFFF, memory space, ROM U907, and DSEL4
selects B@0&-BFFF, memcry space, ROM U906, as there
is only 8K maximum of ROM allowed. Memory space
C@@@,-DFFF, is reserved for external ROM. See Figure 5-5
for memory space map.

NOTE

The subscript H, as in EQ@Q,, denotes a

hexadecimal location in memory or hex
notation of a number.

All of the on board RAM decoding is done by U904B and

U914B. U904B decodes A14, A15, and+2 to form RAME
(RAM Enable) which enables U914B the 2 of 4 decoder.
When Aaislow, depending on the state of A10 (Pin 141,
either SRAwlect lower 1K) memory space &ij@$,-

@FF,,

or SRAM2 (Selected upper 1Kj memory space
04&07FF, is generated to select the appropriate RAM
bank. The RAM chips are 1K by 4K 121147) memory
devices; thus two chips in each bank are necessary for the
required 8 bits of data. U919 and U920 are the low order 4
bits and U922 and U923 are the hi&order 4 bits. The other

signal needed by the RAM’s is the WE (Write Enable) signal.
This signal is generated by U91OC and U909F which decode

R/W,42, and VMA.

The 5VDC regulated to lt5% is provided by VR901 and
associated capacitors. Crystal Y901 and capacitors C910
and C911 form the 4MHz oscillator clock needed by the
6808 IC. The 6808 divides this frequency by 4 and provides
a 1MHz output (Pin 37) E clock for system synchronization.

5.6 ISOLATOR BOARD

The Isolator board interfaces digital bus A to analog bus B.
Four optical isolators are utilized for signal coupling without
impedance coupling. Data, control, and address informa­tion is transmitted (with odd parity) to the analog side of the
isolator, using three of the optical isolators. At the same

time data from the A/D is transmitted to the digital side of
the Isolator board acrcss the fourth optical isolator.

The Isolator board also provides address decoding and
power for the display board as well as buffering for all lines
going to the display board from the digital bus.

Table 5-3. Jumpers for PROM Selection

Configuration

2716

PROMS (2kJ 0 X X 0 l X X X

W901 W902 W903 W904 w905 W906 W967 W908 W909

2732 PROMS (4k) l X X * 0 X X X 0

X = Don’t Care

*=hl

O=Out

5-9

RAM 2k

I

BUFFER AREA lk

OPEN

ISOLATOR

FRONT PANEL PIAI 2643

FRONT PANEL PIA 256

CANNOT USE

l/O 256

266

8%fk?H

. 8400~

IEEE l/O 2k

OPEN

TIMER l/O 512

INTERNAL PROM 6k

EXTERNAL PROM 8k

Figure 5-5. Memory Map

%@H

A%%$

5-10

5.6.1 Isolator Board Theory of Operation

NOTE

When reading through the theory of cpera­ticn for the Isolator Board, refer to
Schematic Diagram 30520D.

The Model 619 Isolator board is designed around the

Synertak 6522 Versatile Interface Adapter (U807).
The board is buffered on data, control, and address lines to

present one bus load to the Model 619 bus. U805 and U806
buffer the data lines. U803 buffers the control and address
lines. U801E. F, and U804A decode BA12, BAll, and
BIOEN respectively to form BDSEL (Board Selectl signal.
There is no buffering on lines BA12, BAll, and BIOEN as
well as BA8, BA9, and BAlO since they only represent one
load to the bus. U8OlA inverts BDSEL to form BDSEL.
There is also one chip select for U807. BDSEL is also in­verted by U801B to form one chip select for the display

board PIA’s.
U802A decodes BA8, BA9, and BAlO to form other chip

selects for the interface. U802A Pin 4 selects U807. This
decoding arrangement places U607 in memory space
80@-8@1FF allowing 256 memory locations, however, only

16 are used. U802A Pin 5 forms Sl which selects U204 on
the display board. This arrangement provides 256 memcty
locations of which only four are used.

U802A Pin 6 forms S2, which selects U207 on the display
board. This provides 256 memory locations of which only

four are used. U802A Pin 7 is not used. All of the additional

signal control lines needed by the display board, E, A6, A7,
and R/W, are buffered by U803. The Data lines D&D7 are
buffered by U805 and U806. Reset and +5VDC and ground

(B corn) are not buffered. All of these lines go to the display

board through connector 801.

U804C and U8OlC decode R/W, E, and BDSEL to form
DRVENB (Drive Enable) (TPll in order to gate the data buf-

fers and to sand data to the data bus.

U801D and U804B decode R/W, E, and BDSEL to form
RECENB IReceive Enable) ITP2) in order to gate the data

buffers for receiving from the data bus.
The heart of the Isolator board is the Synertek 6522

Versatile Interface Adapter (VIA) a fully programmable I/O
device. The VIA internally consists of 2 software prcgram-

mable timers, 2 programmable bi-directional 8-bit parallel
I/O ports (similar to PIA’sJ and a serial communication port.

The device contains control registers which are prcgram-

mable in determining which of the many modes of operation

are to be utilized. Lines CBl and CB2 form the serial ccm-

municaticns port and PA@PA7 (Port A) and PB@PB7 (Port
BJ form the bi-directional parallel I/O ports. Internal register
bits are shown below in Table 5-4.

Table 5-4. Register Commands

RS3 RS2

0 0 0

RSl RSP) Register

0 @RB, IRB
0 0 0 1 @RA, IRA
0 0 1 0 DDRB
0 0 1 1 DDRA
0 1 0 0 Tl
0 1 0 1 Tl
0 1 1 0 Tl
0

1

:, A 1 Tl

0 T2
1 0 0 1 T2
1 0 1’OSR

1 0 1 1 ACR
1 1 0 0 PCR
1 1 0 1 IFR
1 1
1 1

0 IEB

1 @RA

Comments

Effect Handshake
Effect Handshake
Data Direction B

Data Direction A
Timer 1
Timer 1
Timer 1
Timer 1
Timer 2
Timer 2
Serial Port Data
Control Register
Peripherial Control
IRQ Mask
IRQ Enable
No-Efect Handshake

5-11

For the serial I/O, the clock is programmed for a 500kHz
shift rate. The parallel I/O Port A lines PA&PA7 are pro­grammed as inputs and Port B lines PB3-PB7 are also pro­grammed as inputs. Port B lines and PB@ are programmed
as outputs.

Jumper J2 allows for odd parity checking, or no parity
checking depending on the system needs.

The regulated 5V f 5% is provided to the isolator digital
side by VR801 and associated capacitors.

The actual operation is as follows: A byte of data is written
via the software into the 6522 (VIA) serial out register. The

LSI device forms the clock and data for the serial bit streams
on CBl and CB2. The clock bit stream goes through U809A
and opto isolator AT3 and U810A to be the shift clock for

U812, U815 serial to parallel converters, and U816 parallel to
serial converter on the isolated side. U809A Pin 14 is a clock
enable which is utilized to disable the clock if the need
arises. U809A also provides the drive needed by the opto

isolator AT3. The data bit stream goes through opto isolator
AT3 and U810A to be the data for shift register U812 and

U815. U809B provides the drive for the opto isolator AT2.

U811 and U814 are generator parity/checker devices.
When the shifting is completed and U811 Pin 5 goes low,

this indicates odd parity. During the shifting operation, this

line goes low many times depending on the state of the shift

registers. Therefore, U81OB Pin 9 is an enable line, so that
when the data has been sent, the software causes an enable

low after shift. On the analog/digital bus this is used as an

address latch enable signal to latch in the address of the

analog device to which data is being sent. The data to be

written is placed on the outputs of U815 and the address is

placed on the outputs of U812. The software then sends

PB2, which disables the address latch enable, making the

enable line go high. At the same time U810D Pin 4 (latch

line) goes low, this causes the ACK line path to be selected

and ACK (Acknowledge) will be sent back from the analog

side. If the receiving analog device has latched in its ad-

dress, it responds via the ACK line. This is inverted by

U813A and goes to opto isolator AT4 and then to U807,
CAI, and PB7. CA1 interrupts the system when the ACK
line becomes true. Polling can be done to sense a change on

PB7. U813C provides the drive needed by the opto isolator
AT4. There are 2 types of error checking in transit. A parity
check followed by and ACK handshake completion. Upon
error, retransmission of data can be requested via the
software.

To receive data from the analog side, U807 PB2 is set to
disable the ACK path and enable the data path via U813D

Pin 12. The data shifts out at clock CBI rate from U816 go-

ing through U813C, D, and opto isolator AT4 into serial

parallel converter U808. It is then presented to U807 Port A.
The software can then read the E-bit data. On receive U816

recirculates the data presented to it by the analog side.
Thus, multiple reads and compares may be done via soft-

ware to enable error checking for receive data. Upon error,

retransmission of data can be requested via the software.

For test purposes Jumper Jl is provided to allow the

isolator to recirculate data or talk to itself (provided U815

Pin 13 is not being interrupted by the analog bus).

5.7 DISPLAY/KEYBOARD

The display/keyboard has three main areas, the keyboard,

annunciators, and numeric displays. The keyboard area
consists of a four by six matrix for a total of 24 switch loca­tions. Sixteen of these switches are used in the Model 819
to select range, function and channel. The annunciator
area consists of 23 LED’s, The Model 619 uses 21 annun­ciators to display the status of the instrument. The display
area consists of a signed 5%.digit mantissa and a signed
2-digit exponent.

All the display board hardware decoding is done on the

ISOLATOR PCB. The decoding places the PCB at memory

address 81@@,-82FF,. U204 is located at 81@,-81FF,and

U207 is located at 82@,-82FF,. The power for the display
board is also derived from the Isolator board. All signal and
power lines are delivered to the display PCB via the connec­tor cable.

5.7.1 Display/Keyboard Theory of ODeration

NOTE

When reading through the theory of opera­tion for the display/keyboard, it will be
helpful to refer to Schematic Diagram

30515.

The heart of the display board consists of U204 and U207

Motorola 6800 family peripheral interface adapter chips
(PIA’s which are fully software programmable.

The PIA’s internally consist of two programmable control

registers which determine which of many modes of opera-

tion are to be used. The PIA’s also contain two program-

mable data direction registers, which are also data I/O
registers if bit 2 in the corresponding control register is set to

1. Both control registers are initialized to 3C ,. This con­figures the PIA’s for non-interrupt operation stan-

dard mode.

Data direction is configured for U204 by Port A outputs and
Port B outputs, and for U207 by Port A inputs and Port B
outputs.

U204 I/O Port B is the common cathode control strobe used
to turn the display on. Each of the eight lines turns on one
bank of LED’s plus one display digit. U207 I/O Port B is the
segment select control to select appropriate segments of
the display digits U204 I/D Port A lines. PAD, PAI, and

PA2 are the LED select controls to select the appropriate

5-12

LED in the LED bank. U204 I/O Port A line PA3 is used to

key the beeper on and off; U204 Port A lines PA4-PA7form
the column lines to the switch matrix and U207 Port A lines
form the row lines to the switch matrix. U204 Port A lines

PA4-PA7 are used to enable the appropriate switch column
for the software switch scan. U207 Port A is used to read
the scanned switch bank to determine which switch has
been depressed. Switch debounce, N key rollover, and
switch validation are all done in software.

lb is set to approximately the value of Vin max/Rin.

Then Vin = Vmax, I = 0

Vin = 0, I = lb
Vin = Vmax, I = 21b

The charge balancing consists of an integrator, a positive
current source with a current switch, and the negative
signal current.

U201, U203, and U205 are buffers to drive the displays,

LED’s, and switches.

5.8 AID BOARD
The A/D board consists of the basic hybrid charge balance

dual slope AID. There are no references or multiplexed in­puts. The control of this board is from the CPU board
through the digital Isolator board.

The input voltage is converted into a current in the GAMP

(Transconductance Amplifier). When the output of the In­tegrator ramps up to the threshold of the “D” flip-flop, the
2mA current source is turned on until the output of the In­tegrator ramps down below the threshold of the “D” flip­flop. The number of pulses produced is accumulated in the

Event Counter.

Upon completion of Signal Integrate, and based on the
length of time determined by the number loaded into the In­tegration Time Counter, the number in the Event Counter is
multiplexed into the processor. The Event Counter is cleared
and the Single Slope current source is switched on. The
time required to ramp to zero is measured by counting the
clock in the Event Counter. This number is also multiplexed
into the processor. From these two numbers the total

number of counts can be calculated.

5.8.1 AID Theory of Operation

NOTE

When reading through the theory of opera­tion for the A/D board, refer to Schematic

Diagram 30521.

The Transconductance Amplifier (GAMP) performs two

functions:

1. Converts the input signal voltage to a current for the

integrator.

2. It provides an offset to make the A/D bipolar. That is a
plus and minus voltage for input to the AID.

The op amp reference is biased at approximately -2.6 volts
or minus full scale by VR501

as a negative reference, and by

resistors R501 (25k) and KR501 (39k). Resistor R501 l3.9k)

forms a current source due to the constant voltage across it.

It is equal to the voltage across R501 (39k) due to the feed­back action of the op amp.

When U513 Pin 1 (Signal Integrate) goes low, lsig (Signal
Current) flows out of the summing junction and ramps up to
the threshold of the “D” flip-flop, therefore, the current Icb
(Charge Balancing Current) is turned on for one clock
period. Icb is slightly greater than lsig full scale.

The value of C502 which is the integrator capacitor prevents
the output of the integrator from ramping below ground or
above + 5 volts.

U513A enables charge balance pulses only during Signal In­tegrate. 0503 prevents current limiting in the output of
U507 op amp and clamps the output of the integrator to * 5

volts to protect the “D” flip-flop. U507 is a FET input op

amp that prevent any extra currents from flowing out of the
summing junction during the instantaneous overloads as the
charge balance pulses or signal current are switched OFF

and ON.

R503 is a linearity resistor. The nonlinearity in the A/D is a
square law curve. The amount of current removed from the
summing junction by this resistor is proportional to the
voltage across the diode junction to the summing junction in
U507. This induces a compensating logarithmic nonlinear­ity. The basic nonlinearity is only 10 to 50ppm. The compen­sation corrects this error to 1 to IOppm.

The residual charge on the capacitor is ramped down to zero

volts by the Start Single Slope control signal. The single

slope current is l/128 of the charge balance current. This

ratio is between R501 (320k) and R501 i2.44k) taking into

account the base emitter coltage drops of Q505, Q506, and

Q507d. However, the charge balance is on only 50% of the
time, so the effective ratio is 11256 (Refer to Event Counter
Operationl. During operation, the last digit displayed is ap-

proximately the single slope contribution, so this ratio only

has to be accurate to 1% to 10%.

The IMCI line has 10 volts on it and is a byproduct of the

reference circuit on the Filter/Mux board.
The Clock is composed of an oscillator and a divider circuit.

The oscillator is a classic Pierce oscillator circuit developing

4.915MHz. U516 (74193) divides the oscllator frequency to

307.2kHz and 614.4kHz. The 307.2kHz after being buffered
by U508A is divided down even further to 1200Hz by U505
(LS393). The 614.4kHz is gated into the charge balance cir­cuit through U513C and 8.

5-13

The AID essentially runs on its own until it has data for the
processor at certain essential times during the conversion.

The Event Counter is a 16 bit binary counter that is used in
two modes, The first mode is to count the number of charge

balance pulses during Signal Integrate. The second mode is
to count the 5MHz clocks during the ramp down of the
Single Slope. Using the 5MHz clock in this manner, makes
one Single Slope count equal to l/1024 of charge balance
counts. The resolution is thereby increased. The output of
this counter is multiplexed to the Data In Bus, and then to
the processor, 8 bits at a time.

NOTE

The ACK line is low under the conditions

described in the preceding steps 1 through

8.

5.9. FILTER/MULTIPLEXER BOARD
NOTE

When reading through the theory of opera­tion for the FilterlMux board, refer to

Schematic Diagram 30524.

The Integration Time Counter consists of an 8 bit prescaler

counter U505 and an 8 bit programmable down counter
U509 and U510. U505 receives its input from the lowest fre­quency tap of the oscillator divider. U505 drives U510 and
therefore U509 with a frequency of 1200Hz. U509 and U510
are loaded from the processor. Thus, the integration time

can be programmed in increments of 833 microseconds.
This is convenient for integration periods of 16.66msec or
20msec.

The Control Bit Latch register, U517, holds the control bits,

to set up the various control and data paths on this board.

1, Bit 0’. LS bvte A turns on the Vi-state buffer, U512, onto

the Data In Bus.

2. Bit 1, MS byte A@ turns on the tri-state buffer, U519, on­to the Data In Bus.

3. Bit 2, Single Slope Al starts slope and remains at logic
level 1 during the complete ramp down. The counting
and the ramping will stop automatically when the ramp

has crossed zero.

4. Bit 3, Parity. this is not used in hardware. It is used for the
parity bit in software.

5. Bit 4, Force Integration is normally a logic 1 for the pre­sent software, but is could be used to produce long in­tegrations under direct processor control.

6. Bit 5, Event Counter ACK Enable normally a logic 1 in pre-

sent software. It is used to sense MS8 of Event Counter
qn the ACK line when an overflow occurs in a long in­tegration.

7. Bit 6, integrate ACK Enable is normally a logic 1 in pre-

sent software. ACK is asserted during the time the in­tegration time counter is counting.

8. Bit 7. Clear Al resets all counters to zero and thus stops
all functions in progress.

A 3 input Nand gate package (U504) is used to decode so
that only 3 of 8 bits are high at any time. There are two ad­dresses on the board.

1. B$, latches the data on the control Bus into the Integra­tion Time Counter. The address must be present for 4

microseconds and no longer than the integration time,
otherwise it will retrigger the integration.

2. A8, latches the data on the control bus into the Control

Bit Latch on the trailing edge of the address decoding.

The Filter/MUX board consists of the signal conditioning cir­cuitry and references for the A/D board. Channel A and B

Electrometers are selected by the appropriate relays. These
relays (K401 and K402) connect signal and ground on the
Electrometer module to the Al D’s signal and ground inputs.

The Signal FET Driver amplifier (U405) is used to minimize
charge injection from the gate source capacitance of the

FET, into the filter when it is in use.

The Input Buffer (U404) is bootstrapped for linearity. It can

be switched from a times one gain to a times ten gain. Two
references are available for calibration; a 2 volt reference

and a 0.2 volt reference.
The Electrometer Multiplexing relays switch signal and

ground from the two Electrometer modules to the input of
the A/D. The switching is done by K401 and K402. The
relays also provide isolation between the two channels.

The Ground Relay K405 protects K401 and K402 from arc­ing or flashover when switched to the AID. A large tran­sient is possible when this happens due to the stray
capacitance between the AID ground and the Electrometer
ground R431 (IOk) limiting the current during the transient.

K405 is then closed to eliminate rejection problems caused
by having the resistor in the ground lead.

The RC filter, which is a single pole filter, can be switched

into the input of the A/D Converter via relays K403 and
K404. The filter consists of C408 and C409, R433, R436,
and R437.

The neon bulbs DS401 and DS402 fire at approximately 85

volts in order to protect the capacitors in the filter from over
voltage. The leakage resistance at this point, due to the
neon bulbs, will be an order of magnitude less than the least
significant digit, i.e., approximately Ippm. This means the
off resistance of the neon bulbs is > = 130Gohms.

The short time constant RC (C410 and C411, R436, R437,

R433, and R434) is included to suppress high frequency
noise from the output of the Electrometer modules. When
K403 and K404 are actuated, R435 and R432 limit the
resulting discharge current.

5-14

Protection for the input to the AID Buffer amplifier is pro­vided by FET’s Q407 and Q412. They clamp the input to * 5
volts.

The op amp U405 provides a zero volt difference bias
voltage for the signal FET Q409 and compensating FET
Q406. Q406 provides cancellation of the charge injection
due to gate-drain capacitances of these FET’s into the filter
capacitors C408 and C409.

FET’s 0410. 0408. and 0411 provide inputs for Zero, 2

volts, and 0.2 volts respectively.
The A/D Buffer Amplifier is an Xl or X10 gain, high input

impedance, low output impedance stage to couple the
various inputs to the 5k input of the AID board. The dif­ferent gains are obtained by switching in the different feed-

back resistors. The resistors are R418 and R419. Thev are

switched in and out by FET’s Q404 and Q405. The op’amp

has a bootstrapped power supply of *6 volts. The boot-

strap supply consists of U403, Q401 and C403, 13404, and

R407. The bootstrap ground potential is the potential at the
summing junction of U404. This ground is used to reference
the drive resistors of the other input FET’s 0408, 0410, and
Q411. Decoupling or compensation to prevent instability in
the bootstrap is provided by RC’s, C403/R404 and

C402/R405.

The control or logic section consists of two latches. One

I IIU V”llllUl “I ,uy,r. S~lil,“II Gu.l1151SL3 “I Lvw

latch to switch relays and one latch to contra, LIIr I L latch to switch relays and one latch to control the FET swit­ches for the A/D buffer amplifier. U408, wk’ ‘~ . ches for the A/D buffer amplifier. U408, which is the FET

control latch, clocks in the data that is on the control latch, clocks in the data that is on the control bus on

the trailing edge of address @,,, The output of U408 drives

U406 and U407 which are open collector comparators.
These comparators are used to level shift the 0 to 3 volt TTL

signal to -15 to + 5 volt signal to drive the FET switches.

Assignments are signals to drive the FET switches. The bit
assignments are as follows:

1. Bit 0, Al put the buffer amplifier in X10 gain. Ag’puts it in
the Xl gain.

2. Bit 1, Al turns on the signal FET IQ409).

3. Bit 2, Al turns on the zero FET (Q410).

4. Bit 3, Al turns on the 2 volts FET W408).

5. Bit 4, Al turns on the 0.2 volts FET (Q411).

6. Bit 5, not used.

7. Bit 6. Al turns on the charge compensating FET

IQ406).

The software drives this bit with the compliment of Bit 1.

8. Bit 7 Parity. Not used in hardware.
U409. which is the relay latch, clocks in data that is on the

control bus on the trailing edge of address D$.
The bit assignments are as follows:

1. Bit 0, A0 turns on relay K401, Channel A.

2. Bit 1, A0 turns on relay K403, Channel A’s filter

capacitor.

3. Bit 2, A0 turns on relay K402, Channel B.

4. Bit 3, A0 turns on relay K404, Channel B’s filter

capacitor.

5. Bit 4, A0 turns on relay K405 ground relay.

6. Bit 5, not used.

7. Bit 6, not used.

8. Bit 7, Parity. Not used.

5-15

Table 5-5. Analog Bus Connector Pin Assignments Valid for Channel A

SIGNAL

4 COM*
13VAC
h f?OM*

--...
3LANK
3LANK
3H A HI
3H A LO
4 COM*
4 COM
4 COM
4 COM
+ 15VDC

+ 5VDC
+ 5VDC

A COM”

A0

A3
A5
LATCH El

D0pl
442

\lABLE 37

DW

M3
A COM”

IM Ap,
IM A2
IM Ax (C
IM A6
IM A8
IM Al0 59
IM Al2

2-l A LO)

PIN

1
3
5
7
9

11
13

1;

19
21
23
25

27

29

31

33

35

39

41

43

45
47
49
51
53

55
57

61

PIN

2 A COM*
4 33VAC
6 A COM*
8

10

12
14
16
18
20
22
24
26
28
30
32

34
i”s

40
42
44

46
48
50
52

54
56
58
60
62

SIGNAL

BLANK
BLANK
CH A HI
CH A LC
A COM*
A COM
A COM
A COM

- 15VD(
+5VDC

+ 5VDC
Al
A2
A4

A6
A COM’

c01

D03

D’$5

D$7

/ACK

IM Al

IM A3

IM A5

IM A7

IM A9
IM All
IM Al3

5-16

*Shielding ground not to be used as a current supply line.

Table 5-6. Analog Bus Connector Pin Assignments Valid for Channel B

A COM*
CH A HI
CH A LO
CH B HI

CH B LO
A COM’
A COM
A COM
A COM

+ 15VDC
+ 5VDC
+ 5VDC

A COM*
Al
A3
A5
LATCH ENABLE

000

D02

004

Do6
A COM”
IM B0
IM 82

IM 84 ICH A LO)

IM B6
IM BI3
IM 610
IM 812

1

3
5
7
9

11

13
15
17
19

21

2
27
29
31

2
37

39
41
43
45
47
49
51
53
55
57
59

61

PIN

2

i
8

10
12
14
16

18
20
22

24
26
28
30

32
34
36
38

40
42
44
46
48
50

52
54
56
58
60
62

SIGNAI

A COM’
33VAC
A COM’
CH A HI
CH A L(

CH B HI
CH B LC
A COM”
A COM
A COM
A COM

- 15VD(
+ 5VDC
+ 5VDC

A0
A2
A4
A6

A COM’

@‘I
D03
D05
D07

/ACK
IM Bl

IM 83
IM 85
IM B7
IM 69
IM 611
IM 813

*Shielding ground not to be used as a current supply line

5-17

Table 5-7. Electrometer Control

ADDRESSES
CHANNEL A, FUNCTION BYTE

RANGE BYTE

CHANNEL B, FUNCTION

RANGE BYTE
VOLTS
VOLTS, ZERO CHECK

OHMS

lkohm to 1Okohm
lOOkohm to lOOMohm
1Gohm to 1OOOGohm

OHMS, ZERO CHECK

1 kohm to 1Okohm
lOOkoh, to lOOMohm
1Gohm to 1OOOGohm

AMPS

External Feedback
1nA to 1pA
IOpA to lOOpA
1 mA to lOmA.

External Feedback

1A

AMPS, ZERO CHECK

InA to 1pA
lOpA to 100&A
1mA to lOmA.

External Feedback

BYTE A/D RANGE

000 0101 (05)
000 1001 (091

000 0110 (06)
000 1010 (OAI

l*ll 0111 (FF, 871
1'11 0011 (FB, 83)

O"O1 0110 (5E. 16)
lx01 0110 (DE, 96)
lx11 0110 IEE, B61

O"O1 0010 (5A. 12)

lx01 0010 (DA, 921
lx11 0010 (EA. 82)

1"ll 0101 (FD. 65)
I*11 0101 (FD. 65)

Ox11 0101 (7D, 351

I"11 0101 (FD. 651
I"10 0101 (ED, A51

lx10 0101 (ED, A51

O*lO 0101 (6D. 251

l*lO 0101 (ED, A5)

5-18

RANGE BYTE

VOLTS

IOOmV
1v
1ov
1oov

OHMS

lkohm
1Okohm
lOOkohm
1Mohm
1OMohm
IOOMohm

OHMS

IGohm

lOGohm
1OOGohm
1OOOFohm

BYTE

1111 0111 (F7)
1111 0111 (F7)
1101 1101 (DD)
1111 1101 (FDI

1111 0011 IF31
1111 0011 (F3)
1111 0011 (F3)
1111 0011 (F31
11100111 (E7)
11100111 (E7)

1100 1101 (CD)
1011 0111 (87)
1001 1101 (9D)
1011 1101 (BD)

A/D RANGE

1oomv

IV
IV
1v

1OOmV
1v
1OOmV
1v
1OOmV
1v

1v
1v
1v
1v

Table 5-7. Electrometer Control (Cont.)

\MPS

1nA
1OnA

lOOnA
llrA
10fiA
1OOA
1mA
1OmA
1A
External

Feedback

“Range Disabled Bit (DO61

1 Range Byte control disabled

0 Flange Byte control enabled

Byte data is binary.
Data in parenthesis is in
hexadecimal notation.

11100111 (E71 1OOmV

0111 (E71

1110

0011

1111

0011 (F3)

1111
1111 0011
1111 0011

0111

0111

0111 0111

1110 (FE)

1111

1111 0111

(F3l
(F31

(F3)

177)
(77)

IF71

IV
1OOmV
1v
1OOmV
1v
1OOmV
1v
IOOmA

IV

Table 5-9. Control Data Bit DesiQnatiOns

RANGE BYTE

K603 IAmp
k662 X0.1/X0.01 Output

K656 Volts/Ohms,

K652 lMohm/lOkohm Feedbacl

Zero Check
Not Used
K655 Amps, Zero Check
K659 ohms Input

K661 Xl output
K653 IOOMohm Feedback
K660 x0.1 output

Voltage Limit

Range Disable
K657 IOkohm Feedback

K654 IOGohm Feedback
K651 IOOohm Feedback

‘Relay Designation Refer to Schematics 305220 and 30523.

5-19/5-20

SECTION 6

MAINTENANCE

6.1 INTRODUCTION

This section contains information necessary to maintain the
Model 619. Adjustment calibration, troubleshooting and
fuse replacement procedures are provided.

6.2 PRE-POWER UP PROGRAMMING

The top cover of the Modal 619 must be removed to check
or change the LINE VOLTAGE, LINE FREQUENCY and

BEEPER switches. To remove the top cover, remove the
two retaining screws located at the rear of the instrument
and lift the cover off.

WARNING

All service informrrtion is intended for
qualified electronic maintenance per­sonnel only.

WARNING

To prevent a shock hazard, remove the

line cord and all test leads from the in-

strument before removing the top

cover.

Sat up switches 5301 and S302 par instructions given in
Table 6-l. instructions are also printed on the power sup­ply shield.
Refer to Table 6-l and select and install the properly rated
line fuse.

CAUTION

Installing a higher rated fuse than the
one specified could result in damage to

the instrument.

Reinstall the power supply shield.

Select the appropriate line frequency by setting switch 4 of
S801 (Figure 6-l) to the closed position (0) for 60Hz opera-

tion or to the open position (1) for 50Hz operation. If the

Modal 619 is on while changing the switch position, the new
frequency setting will not be accepted until the instrument is
turned off and then powered back on.

6.3 BEEPER SELECTION

The beeper is programmed to be operational at the factory;

however, it can be disabled if so desired.

1. Remove the top cover.

6.2.1 Line Voltage and Frequency Selection

Position switches and install appropriate fuse

as

follows

(refer to Figure 5-21:

1, Remove the power supply shield by carefully lifting it off

of the four retaining clips.

Table 6-l. Line Voltage Selection

Line Voltage

9ov-1lOV

105V-125V

18OV-220v

21OV-250V

s301
HI-LO
Switch Switch

LO

HI 1lOV

LO

HI

S302

llo-220v

1lOV

220v 3AG. SLO BLO
220v

WARNING

To prevent a shock hazard, ramova the

line cord and all test leads from the in­strument before removing the top
cover.

TYPO

3AG. SLO BLO
25OV. 1A

3AG. SLO BLO

25OV, 1A

25OV. 1/2A

3AG, SLO BLO
25OV. 1/2A

6-l

2. Set switch 1 of S801 on the Isolator Board to the open
position (1) (refer to Figure 6-l).

3. Reinstall the top cover.

6.4 READING RATE SELECTION

When the Model 619 is in the Front Panel Mode and the 5%
digit resolution mode, two different reading rates can be
chosen via S5 (2.41 rdg/secl or S8 IO.30 rdglsec). See
Table 2-6. To select the S5 reading rate:

1, Remove the top cover.

WARNING

To prevent a shock hazard, remove the

line cord and all test leads from the in-

strument before removing the top

cover.

2. Set switch 2 (Figure 6-l) on the Isolator Board to the
closed position IO).

3. Reinstall the top cover.

To select the S8 reading rate:

1. Remove the top cover.

WARNING

To prevent a shock hazard, remove the
line cord and all test leads from the in­strument before removing the top

cover.

2. Set switch 2 (Figure 6-l) on the Isolator Boardto the open
position (1).

3. Reinstall the top cover.

6.6 CALIBRATION INTRODUCTION

Perform the following procedures and make the
adjustments indicated to calibrate the Model 619 Elec­trometer/Multimeter, and the Model 6194 Electrometer
Module(s). Calibration of the Model 6194 requires install­ation in a Model 619 main frame. Therefore, the following
procedures include calibration of the module as part of the
entire instrument. Calibration should be performed yearly
(every 12 months) or whenever performance verification

(see Section 3) indicates that the instrument is out of

specification.

SWITCH 1 1 = BEEPER ON 0= BEEPER OFF
SWITCH 2 1 =S8 RATE AT 5Xd O=S5 RATE AT 5%d

SWITCH 3 EXTERNAL TRIGGER

SWITCH 4 1 =50HZ 0=6%

r

Figure 6-l. Isolator Board and Switches

OPEN = 1
CLOSED =0

6-2

NOTE

Calibration of the Model 619 requires cur­rents and impedances outside the ranges

normally encountered in calibration

laboratories, Due to the need for special

handling, high level technical expertise, and
non-standard test equipment, it is strongly
recommended that the Model 619 be return-

ed to the factory for service and/or

calibration.

6.6 CALIBRATION/TEST EQUIPMENT AND
CONDITIONS

6.6.1 Recommended Test Equipment and
Related Information

Test equipment for calibration is listed in Table 6-2. Alter­nate test equipment may be used. However, the accuracy of
the alternate test equipment must meet specifications listed
below:
Voltage Sources t *20ppmj

190.0000mV

1.999999v

19.99999v

199.9999v
Current Sources f *200ppml

19.000mA

190.00wA

1.9000pA

19.000nA
Calibration Resistance

19kD f IOOppm
19GO * 1OOOppm

6.7 INFORMATION AND ASSUMPTIONS

6.7.1, Standards

Maximum Allowable Input:
Input overload source must be noninductive with a

capacitive component less than 5OOOpF.

Isolation:
Input LO to power line ground, ) lOOMohm shunted by
approximately 75OpF. AID Converter common to
Electrometer Module Input, (0.5pF.

Input Stability:
Stable with < 5OOOpF input to input common and/or guard

(analog output in Volts or Ohms) and analog output to input

common.

Ranging:
Manual or Automatic in Talk-Only mode.
Manual in Addressable mode.
Range exponents are multiples of three (0, *3, +6, +9,

*12, *15, *la).

Weight:
Model 6194 Electrometer: lib. 1202. (0.81kgj
Model 6193 IEEE-488 Interface: 6.50~. (0.18kgj

Model 6191 Guarded Adapter: 502. (O.lBkgj

Maximum Allowable Common Model Slew-Rate:
109 volts/sac., with no loss of data or commands across
isolator.

Analog Output Characteristics:
Voltage: V,,, = V

Current: V,“r =

* 1 mV

[Is x RfeedbackjflmV=200mV F.S. on
2nA. 200nA. 20rA, 2mA ranges.
2 Volt F.S. on 20nA. 2pA. 200pA. 20mA ranges.
Resistance: V,,r

=R, x lsense* 1mV (Output same as
voltage across unknown. Refer to paragraph 6.6.1 for F.S.
values.1

Output Resistance: lkohm
Maximum Allowable Output Current: ImA
Maximum Allowable Input Voltage (externally applied with

respect to Analog Output common): 20 Volt peak.

6.8 VOLTS

Accuracy Specification Assume:
With input offset corrected by Zero Correct function after

warm-up, and every 24 hours thereafter. Correct whenever

IdT,I ) 1°C. Spec exclusive of noise. Specified temperatures

are package ambient. With ) 1 line period integration.
Temperature Coefficient Specifications Assume:

With source resistance ( lOOMohm.

NMRR Specifications Assume:

> 55dB valid with DC inputs up 90% of &full scale.
Rating based on 1 digit injection on 2 Volt through 200 Volt
ranges and 4 digits injection on 200mV range.

At 50 and 60Hz. max. rdg rate, with 1 line-period inte-

gration.
Filtering adds 25dB.

CMRR Specifications Assume:

) lOOdE valid for 200mV and 2 Volt ranges. Rating
decreases to 80dB for 20 Volt range and 60dB for 200 Volt
range.
At DC, 50, and 60Hz with lkohm unbalance, max. rdg rate,
1 line-period integration.

Analog Settling Time Specifications Assume:
Exclusive of input noise, with less than 1mA of total resistive
and dV/dT capacitive analog output load Imax. capacitance
5000pfl.
Exclusive of source response time and AID conversion
time. Refer to Model 619 Systems Use Specifications for
digitization times,

Input Noise: 2OpV p-p Assuming:
With source resistance < lOOMohm. Over 1 minute, un­filtered, self-generated.

6-3

Table 6-2. Recommended Test Equipment

Item Description

A DC Calibration

Output

1.999999v

19.99999v

199.9999v
B Current Source
C Decade Resistor

1 OpA9A
120kD/lOk-Step S

llOMD/lM-Step S

D R-289-IOG

IOGO

Resistor

E R-289-100G

lOOGO

Resistor

F Ohms Calibration

6.9. AMPS

106-10’3

External Feedback has the following specifications:

ACCUrElCy

0.002% or 20ppm

0.01%
5Oppm

50wm

1OOOppm
1OOOppm

Mfr. Model

Fluke 343A 1

Valhalla 2500 1
ESI SR-1010 1

SR-1050 1

K-l
K-l
Guideline 9520 1

Input. NMRR, Noise, and Analog Settling Times will be a
function of the feedback element. Displayed reading is the
voltage across the External Feedback element.

2

1

TEMPERATURE

RANGE READING

MAXIMUM

External
Feedback 1.9999 Wts,

ACCURACY COEFFICIENT

f year. 230 *ST
* (%rdg + digits)

0.01% + Id

o-1wc

an* 28.5oQC

ff% rdg+digits~,T

0.cK32% + 0.3d

m,

External Feedback range requires user supplied feedback
element for current to voltage conversion (resistor), charge
to voltage conversion (capacitor), etc. Accuracy,
Temperature Coefficient specifications are in addition to
(but not including) that of feedback element. Feedback ele­ment is connected from the Analog Output to the Module

6-4

Accuracy Specifications Assume:
With input offset corrected by Zero Correct function after
warmup and every 24 hours thereafter. Correct whenever
dTa ) l°C. Spec exclusive of noise. Specified temperatures
are package ambient. With > 1 line-period integration.

NMRR Specifications Assume:
Valid with DC inputs uo to 90% of + full scale.
At 50 and 60Hz; max.’ rdg rate, with 1 line-period integra­tion,

Filtering adds 25dB.

Analog Settling Time Specifications Assume:
With less than ImA of total resistive and dV/dT capacitive
analog output load (max. capacitance 5OOOpF).

Exclusive of source response time and A/D conversion

time.

Refer to Model 819 System Use Specifications for digitiza-

tion times.

Input Noise:

2fiA : 5d

20pA: 0.5d

200fiA. 20r~A. 2fiA, 2A : 2d

2r1A. 200pA. 20fiA : 0.3d

External Feedback : 0.3d

6.13 CALIBRATION COVER INSTALLATION

Calibration should be performed using the Model 6195

Calibration Cover (see Figure 8-21. This cover permits ac­cess to Model 619 and to Model 6194 adjustments, while
allowing the instrument to reach normal internal operating
temperature. Install the cover as follows:

Digits, peak to peak, over 1 minute, unfiltered, self­generated, 4% digit readout.

Input Voltage Drop:
Whenever a series connected voltage source and resistor
are used to calibrate, or verify the Model 619 Amps range,
the effect of the input voltage drop must be taken into ac­count. From the specifications the maximum value of 1mV
will constitute an uncertainty in the effective accuracy of the
voltage source. Maintaining this source at voltage levels

) 1.9V will reduce this uncertainty to : 0.05%.

8.10 OHMS

Accuracy Specifications Assume:
With input offset corrected by Zero Correct function after
warm-up and every 24 hours thereafter. Correct whenever

dT, ) l°C. Spec exclusive of noise. Specified temperatures

are package ambient.

With ) 1 line-period integrations.
~External voltage sources ( 5OpV.

6.11 ENVIRONMENTAL CONDITIONS

Calibration should be performed under laboratory condi-

tions having an ambient temperature of 23O * 1°C. and a

relative humidity of less than 70%. If the instrument has
been subjected to temperatures outside of this range, or to
higher humidity, allow one hour minimum for the instru­ment to stabilize at the specified environmental conditions

before beginning the calibration procedure.

6.12 CALIBRATION

WARNING

To

prevent

line cord and all test leads from the in­strument before removing the top
cover.

a shock hazard, remove the

1. Turn the power off and disconnect the line cord.

2. Remove the two screws holding the top cover. These
screws are located on the rear panel.

3. Grasping the top cover at the rear, carefully lift it off the
instrument,

4. Install the Calibration Cover on the Model 619.

6.14 CALIBRATION ADJUSTMENTS

The sequence of calibration adjustments is as follows:

1. Input amplifier zero.

2. A/D reference supply calibration.

3. Multiplier calibration.

4. Amps calibration.

5. Ohms reference calibration.

Perform the following procedures and make the ad-

justments indicated to calibrate the Model 619. The location

of the calibration pots is indicated on the Model 6195
Calibration Cover (see Figure 6-2).

1. Input Amplifier Zero: Place the instrument in Zero

Check, Channel A, Volts, and Manual ranging. Should
the instrument have only one Electrometer module, it
must be located in position A (Channel A). Set the
Model 619 to the 200mV range and adjust R656 for a
display reading of 0.00 -3 within + 1 count.

NOTE

When calibrating Channel B, paragraph

6.14, do not repeat steps 2 and 3 of same
paragraph

In order to reduce the response time induced

by stray capacitance, the Model 6191 Guard­ed Input Adapter could be used for reduced
input cable effect (see paragraph 3.21. The

internal short across the 1OMR resistor must
be in place when using the Model 8191 for

calibration.

NOTE

Zero Correct should not be used prior to this

step.

2. 200mV A/D Reference Supply Calibration: Using the
DC Calibrator and 1O:l divider, apply + 190.00mV to the
input of the Electrometer. After actuating the Zero Cor­rect, release the Zero Check and adjust R411 for a
display reading of + 190.00 -3 to within + 1 count. Refer
to Figure 6-3.

3. 2 Volt A/D Reference Supply Calibration: Uprange the
Model 619 to the 2 Volt ranae. and suolv + 1.9000 Volts
to its input. Adjust R415 for a display reading of

+ 1.9000 +0 to within + 1

count.

Refer to Figure 6.4.

8-5

R41, 200MV A/D REFERENCE ADJ.
R415 2V A/D REFERENCE ADJ.

Figure 6-Z. Calibration Cover

R651 ZOMA RANGE ADJ.
R652 200pA RANGE ADJ.
R653 1AA RANGE ADJ.
R654 1OnA RANGE ADJ.

R655 1OGg RANGE ADJ.
R656 INPUT AMPLIFIER ZERO

Re7S x0.01 MULTIPLEXER ADJ.

R680 x0.1 MULTIPLEXER ADJ.

4. X0.1 Multiplier Calibration: Uprange the Model 619 to the
20 Volt range and apply + 19.000 Volts to its input. Adjust

R680 for a display of + 19.000 +0 to within f 1 count.

5. X0.01 Multiplier Calibration: Uprange the Model 619 to
the 200 Volt range end apply f 190.00 Volts to its input.
Adjust R679 for a display reading of + 190.00 + 0 to
within f 1 count.

6. 20mA Range Calibration: Zero Check the Model 619 and
set it to the Amps function. Uprange to the 20mA range
end verify a display reading of 19.000 -3 using Zero Cor­rent if necessary. Release Zero Check and apply a

+ 19.000mA input, adjust R651 for a display reading of

19.000 -3 to within *2 counts, Refer to Figure 6-5.

NOTE

For a valid Zero Check reading the input cur­rent must be less than 100&A.

7. 200pA Range Calibration: Zero Check the Model 619 and
downrange to the200pA range. Apply + 19O.OO~A to the

input of the Model 619, release the Zero Check and adjust
R652 for a display reading of + 190.00 -6 to within k2
counts.

6. 2&A Range Calibration: Zero Check the Model 619 and
downrange to the 2+A range. Apply + 1.9000/1A to the
input of the Model 619, release the Zero Check and adjust
R653 for a display reading of + 1 SO00 -6 to within rt 1
count,

9. 20nA Range Calibration: Zero Check the Model 619 and
downrange to the 20nA range. Apply + 19.000nA to the
input of the Model 619, release the Zero Check and adjust
R654 for a display reading of + 19.000 -9 to within *2
counts. Refer to Figure 6-6.

10. 20kQ Range (Ohms Reference) Calibration: Zero Check
the Model 619 and set the Ohms function. Select the
20kDrange and verify a display reading of 0.000 +3
using Zero Correct if necessary. Connect the 19kB

Calibration Resistor to the input of the Model 619,
release the Zero Check and adjust R657 for a display
reading of 19.000 +3 to within fl count. Refer to
Figure 6-7.

NOTE

Select the 19GQ precision resistor using
equipment with accuracy traceable to

National Bureau of Standards Laboratory.
The resistance value should be determined
to within IOOOppm.

6-6

Figure 6-3. Supply Calibration .200mV

VOLTAGE SOURCE

MODEL 619

ELECTROMETER MODULE

REAR PANEL INPUT

--CC-

--cc

-5-J

TRIAX CONNECTION

TRIAX CONNECTION

MODEL 619

ELECTROMETER MODULE

REAR PANEL INPUT

MODEL 6011
INPUT CABLE INPUT CABLE

MODEL 601,
INPUT CABLE

<t

WAX CONNECTION

VOLTAGE SOURCE

Figure 6-4. Supply Calibration 2 Volt

CURRENT SOURCE

MODEL 6011 INPUT CABLE

Figure 6-5. Range Calibration 20mA

MODEL 619

ELECTROMETER MODULE

REAR PANEL INPUT

>’

L>

TRIAX CONNECTION

6-7

11. 20GC Range Calibration: Calibrate the 20Gg range see
Figure 6-8. Zero Check the Model 619 and upranga
to the 20GQ range. Connect the 19G9 Calibration

Resistor to the input of the Model 619, release the Zero

Check, and adjust R655 for a display reading of 19.000

+ 9 to within f 15 counts.

12. Range Verification: After range calibration perform the
verification procedures. Refer to Section 3 for these
procedures.

13. Channel B Calibration: If a Channel B Electrometer is in­stalled in the Model 619, Steps 1 and 4 through 12 must
be reoeated for this channel.

NOTE

Do not repeat Steps 2 and 3.

6.15 CALIBRATION FIXTURE

The required calibration fixture uses a source of 19Gg. Its

resistors must be accurate to 1000ppm.

1. The following items are necessary for proper calibration:
A. 2 lO.OGC resistors, Keithley part number R-289.IOG.

B. 1 lOO.OGC resistor, Keithley part number

R-289.100G.

C. 2 enclosed chassis boxes one to be placed inside the

other and insulated from each other.
D. 1 triax connector, Keithley part number CS-181.
E. 1 banana jack, Keithley part number BJ-Il.
F. 1 6191 Guarded Input Adapter.
G. 7024-l triax cable (1 ft long, male to male

connector).

r-------- -----------:

10M 10M IOM IOM IOM IOM 10M 10M 10M IOM 10M 1OMl 10M IOM IOM IOM IOM 10M 10M 10M IOM 10M 1OMl

II

/!I+fKyTj;;:

Figure 6-6. Range Calibration, 20nA

r-------- -------

SR-1010 CONFIGURATION FOR 19kg RESISTOR

SRI050 CONFIGURATION FOR IOOMD RESISTOR

TRIAX CONNECTION

A

Y 0

6-8

-----------___

90k

MODEL 619

ELECTROMETER MODULE

REAR PANEL INPUT

Figure 6-7. Range Calibration 20k0

MODEL 6011

i

TRIAX CONNECTION

INPUT CABLE

NOTE

Possible scurces of high value resistors are:

Dale Electronics, Inc., Columbus, Nebraska
Victoreen. Cleveland, Ohio K b M Elec­tronics, West Springfield, Massachusetts.

2. Refer to Figure 6-9 for a schematic of the calibration
fixture.

Once the value of the 19GO source has been established, it
may be used (for calibration) for a limited time. The stability
specifications of the resistors used will determine the length
of time the 19Go scurce can be used. After this time, the ex­act value of the 1.9GQ sowce must again be determined.
The teraohmmeter can be used to reestablish the value.

6.16 TROUBLESHOOTlNG

6.16 CONSTRUCTION INFORMATION

1. To decrease settling time and to assure accurate calibra­tion, an internal guard is recommended (see Figure 6-9).
The guard must be isolated from the surrounding case.

2. To further minimize inaccuracies, current leakage paths
to ground (or guard) must be minimized. This requires
the use of low leakage insulating materials (such as
Teflon@ ) for construction and the use of special cleans­ing agents (such as Freon) to clean the components and
insulators after construction.

6.17 CALIBRATION of 1.9GQ SOURCE

Connect the 19GO source to a teraohmmeter. A meter with

acceptable accuracy is listed in Recommended Test Equip-

ment, Table 6-2). Determine the value to within *lOOO
ppm. This must be done at a temperature of 23°C f 1%

The troubleshooting information in this section is intended
for use by qualified personnel who have a basic understand-

ing of the analog and digital circuitry used in a precision test
instrument. Instructions have been written to assist in
isolating the defective circuit. Isolating the defective com­ponent has been left to the troubleshooter.

NOTE

For instruments that are still under warranty
(less than 12 months since date of
shipment), whose performance is outside of
specifications at any point, contact your
Keithley representative or the factory before
attempting troubleshooting or repair other
than battery or fuse replacement.

6.16.1 Special Handling of Static Sensitive Devices

CMOS devices are designed to function at high impedance
levels. Normal static charge can destroy these devices.

Table 6-3 lists all the static sensitive devices for the Model

619. Steps 1 through 7 provide instruction on how to avoid
damaging these devices.

SHIELDED TEST FIXTURE

----_

ii-

L - _ - _ -dim/

----

TRIAX CABLE

AA

' I

Figure 6-6. Range Calibration, 20GO

ANALOG OUT

(GUARD

CONNECTION)

619

>t

>t

>>-

>>

MODEL 619

ELECTROMETER MODULE

REAR PANEL INPUT

6-9

Table 6-3. Static Sensitive Devices

6.16.2 Troubleshooting Procedure

Reference Designation

lJ202

Keithley Part Numbal

IC-141

U204, U207

lJ807
u905
U906

u907. u915. u924

u913.

u919, u920, u922, u923

LSI-28
LSI-27
PRO-114-•

PRO-1 15.”

LSI-26

LSI-15

1. Devices should be handled and transported in protective
containers, antistatic tubes or conductive foam.

2. Use a properly grounded work bench and a grounding
wriststrap.

3. Handle device by the body only.

4. PCB’s must be grounded to bench while inserting

devices.

5. Use antistatic solder suckers.

6. Use grounded tip soldering irons.

7. After devices are soldered or inserted into sockets they

are protected and normal handling can resume.

1. General Procedure
A. Turn the Model 619 ON.

B. Observe the proper indication on the display.

(a) Initially the display is blank and the beeper

sounds for approximately two seconds.

(b) Display shoes line frequency and level of the

software e.g. F60 C-l.

(cl The Model 619 ends up in the default conditions

e.g. Volts, Channel A, Zero Check.

C. Visually inspect all PC Boards to verify that they are

properly seated in the connectors.

2. Power Supply Checks

A. J305 pins 1,2,3,4 referenced to analog common has

33VAC f5%.

B. J305 oin 8 referenced to analoa common has + 15V

*5%:

C. J305 pin 9 referenced to analog common has -15V

+5%.

D. J305 pin 10, 11 and 12 referenced to analog common

has +5V f5%.

E. J304 pins 6,7,8 and 9 referenced to analog common

has +9.5V f5%.

F. Check each PC Board for appropriate voltage as

shown on the schematic diagram.

lOOGO

I

1. To decrease settling times and to assure
accurate calibrations. it is recommended
to use an internal guard (as shown in the
drawing abovel. The guard must be in­sulated from the surrounding case.

2 .To further minimize inaccuracies, current

leakage paths to ground for guard1 must
be minimized. This requires the use of low
leakage insulating materials (switches1 for
construction and the use of special cleans­ing agents such as freon@ to clean the
components and inwlators after construct
tion.

CONNECTOR

BANANA JACK

6-10

Figure 6-9. Calibration Fixture Schematic Diagram

TRIAX RECEPT.

HI

---------

6191 ADAPTER

TRIAX PLUG

GUARD

UNGUARDED

NOTE: TRIAX RECEPT. IS INSULATED FRO,“,
CASE WHICH IS GROUNDED

THRU TRIAX PLUG.

Figure 6-10. Model 6191 Guarded Adapter

ANALOG OUTPUT

I

TO 619

3.

Clock Checks
A. CPU Borad (PC-5181, U905 pins 38 and 39 has 4MHz

at a TTL level.

B. A/D Board (PC-5201 Y501 has 4.915MHz. U516

divides this frequency to 307.2kHz lU516 pin 7) and

614.4kHz (U516 pin 61.

4. Logic Section Checks (CPU Board)
A. Verify data transfer from chip to chip.

B. Verify address logic and timing.

5. Isolator and Filter MUX Boards
A. Verify data transfer through the opto isolators ATl-

AT4 on the Isolator Board.

8. Check various voltages on the Filter MUX Board as
shown in the schematic diagram.

C. Check operation of Channel A and Channel B relays.

6. AID Converter Checks
A. Check signal paths from the Filter MUX Board to the

A/D Board.

B. Check integrator Output (U506 pin 2) as shown in

Figure 6-11 integrator output waveform.

7. Electrometer Checks
A. Check feedback loops of U651,

B. Check switching order of feedback loops.
C. Check bootstrap supplies (Test Points).

8. Front Panel Operation
It is important to check the front panel opration because
it will help to isolate the problem as a result of the read
out on the display.

6.19 Fan Filter Cleaning

The Fan Filter must be kept clean. Dirt in the filter will
impede the air flow through the Model 619 and cause
overheating. It is recommended to periodically remove the
filter (FL-31 and use compressed air to clean it.

6-I 1

Figure 6-11. Integrator Output Waveform

6-12

SECTION 7

REPLACEABLE PARTS

7.1 INTRODUCTION
This section contains replacement parts information, com-

ponent location drawings and schematic diagram for the

Model 619. A cross-reference list of manufacturers is also

provided (see Table 7-l ).

7.2 PARTS LIST
Parts are listed alphabetically in order of their circuit

designations. Table 7-2 contains parts list information for
the Display Board PC-514. Table 7-3 contains parts list infor­mation for the Power Supply PC-515. Table 7-4 contains

IEEE Interface PC-517 parts list information. Table 7-5 pro-

vides parts list information for the CPU Board PC-518; while
Table 7-6 contains parts list information for the Isolator

Board. Parts list information for the AID Converter PC-520
is presented in Table 7-7. Parts list information for the Elec-

trometer Module PC-523 and PC-522 are provided in Table
7-E. Table 7-9 contains parts list information for the Filter

MUX Board PC-521. Table 7-10 provides parts list informa-

tion for the Fan assembly.

7.3 ORDERING INFORMATION I. Figure 7-9. Filter MUX Board 30352D

To place an order, or to obtain information concerning

replacement parts, contact your Keithley representative or

the factory. See inside front cover for addresses. When

ordering include the following information:

1. Instrument Model Number

2. Instrument Serial Number

3. Part Description

4. Circuit Description (if applicable)

5. Keithley Part Number

7.4 FACTORY SERVICE
If the instrument is to be returned to the factory for service,

please complete the service form which follows this section
and return it with the instrument.

7.6 SCHEMATIC DIAGRAMS AND COMPONENT
LOCATION DRAWINGS

Schematic diagrams and component location drawings
follow the rsplaceable parts list information contained in this
section.

1. Component Location drawings for the Model 619 are as

follows:
A. Figure 7-l. Mother Board 30411C

B. Figure 7-2. Display Board 32003D
C. Figure 7-3. Power Supply Board 32004D
D. Figure 7-4. IEEE Interface Board 30329D
E. Figure 7-5. Processor Board 32005D

F. Figure 7-6. Isolator Board 32006D
G. Figure 7-7. A/D Converter Board 30395D
H. Figure 7.8. Electrometer Module Board

30387D and 30391D

2. Schematic diagrams for the Model 619 are as follows:
A. Figure 7-10. Mother Schematic 30517D

8. Figure 7-11. Display Schematic 306150
C. Figure 7-12. Power Supply Schematic 30516D

D. Figure 7-13. IEEE Interface Schematic 30518D
E. Figure 7-14. Processor Schematic (CPU) 30519D
F. Figure 7-15. Isolator Schematic 3052OD
G. Figure 7-16. A/D Converter Schematic 30521D
H. Figure 7-17. Electrometer Module Schematic

30522D and 30523D

I. Figure 7-18. Filter MUX Schematic 30524D

7-l

­5;;

UAME AND ADDRESS

-B

Illen-Bradley carp.
Milwaukee, WI 53204

Table 7-1. Cross-reference List of Manufacturers

FEDERAL

SUPPLY CODE

01121

MFR.
CODE F

F-I i

IAME AND ADDRESS
:airchild Instruments

b

lountain View, CA 94043

FEDERAL

SUPPLY CODI

07263

-0

4nalo9 Devices, Inc.
Vorwood, MA OZOZG

CI

I\merican Components, Inc.
:onshohockcn, PA 19423

YP

4mphenol
Iroadvicw, IL 60153

,%xkman Instruments, Inc.

EC

Fulierton, CA 02634

KG

ierij Electronic, Inc.
NEW Cunbcrland. PA 17070

011

3omar Crystal CO.
Yiddlcspx, NJ flI11~46

RN

Rourns. Inc.
,liwrsidc, CA 92507

Comp”ne”ts, 1°C.

-I
i3iddeford, ME 04005

C u K Components, Inc
Watertown, MA 02158

AD

Cnddock
Riwrsidc, CA 92507

LR

Centralab Division
Milwaukee, WI

53201

24355

1429?

02660

1318il

22526

--

80294

06751

09353

I%47

7159"

G-E (

GKH (

H-l' 1

INT I

ITT I

KaM i

K-I k

I.-F I

FIAL r

MIP I

ilMM ;

;eneral Electric Co.
iyracuse, Ny 13201

irayhill. Inc.
.a Granqe, IL 60525

L

icwlett-Packard Co.
'ala Alto, CA 94304

r

;ntersil, Inc.
:upertino, CA 95014

(

ITT Semicondlrctor

I

~awrance, MA 01841
: n M Electronics Co.

E

linncapolis, MN 55435
:cithley Instruments. Inc.

c

:lcvcland, Ohio, 44139
.ittlc Fuse, Inc.

I

1~s Plairvs, IL GO016

431 l0ry

Indianapolis, IN 46206

4rpco. Inc.

I

Morristown. NJ 07960
3M Company

it. Paul,

MN 55101

03508

81073

50444

32293

15238

_-

80164

75415

90201

80031

--

OC

DT

OW

TS

LF

CT

nr

MC

RI

-

7-2

Corcom

Chica9", IL 60639
Cot".Coil Co., Inc.

Providencr, INI 029flS

Continental Wirt

Warminster, PA

CTS Corporation
Elkhart, IpI 46514

Dale Electronics
Colunbus, NE 68601

ElectrO-Cube, Inc.
San Gabriel, CA 91176

Electronic Devices, Inc.

Yonkers, NY 10710

EMC Industries, Inc.
Hatbor", PA 19040

Eric Technological Prod.

Erie, PA 16512

05245

71707

79727

71450

91637

14752

83701

50417

72982

401fX
30wnc1.s Grove, IL GO515

Ylon5ant.o

it. Louis. MO 63122

MOT 1

MIIR I

NAT

NEC

NIC Nichicon Corp.

NYT

PAT

Yotorola Srmi Products, Inc.
'hoenix, AL 85008

I

"lurata Carp. of America

I

!Imsford, NY 10523
National Semi Corp.

Santa Clara. CA 94086
NEC Microcomputer, Inc.

Lcxinqton, MA n2173

Chicago, IL 60645
Nytronics Components Group

3arlington, SC 29532

I

Pattison Supply Co.
Cleveland, OH 44125

27264

76541

04713

51406

27014

--

--

83125

--

Table 7-1. Cross-reference List of Manufacturers lCont.1

7-3

Circuit
Desig.

c201

Description

.l,,F, 5Ov, CerF

Table 7-2. Display Board PC-514 Parts List

-

Schematic
Location

514/81

PC-Board

.tem No./Location

3/G?!

Mfr.
Code

­ERI

Mfr.
Desig.

GlZl-MO50

651.104M

Keithley
Part No.

C-237-.1

c202

c203

C204

C205

C207

C208

DS201
DS202
DS203

OS204
OS205
OS206
DS207

.luF, 5OV, CerF

.luF, 5OV, CerF

33vF, lOV, Tant

.lpF, 5OV, CerF

.l,,F, 5OV, CerF

lOOOpF, CerD

Digital Display tl
8 Segment Display
8 Segment Display
8 Segment Display
8 Sequent Display
8 Sqment Display
Digital Display rl

514iRl

514/51

514/A1

514/01

514/Bl

514lF4

514lEl
514/El
514lFl
514/Fl
514iF1
514/Fl
514fGl

4/03

5/c3

b/C3

7103

9lR4

lo/H3

14/A2
15lA2
16/A2
17102

18iB2

19/B2

2o/c2

ERI

ERI

C-I

ERI

ERI

ERI

F-I

F-I
F-I
F-I
F-I

F-I
F-I

8121-MO50

651.104M
RlZl-MO50

651.104M
TSD 3-10

336-PCM 1287

8121-MO50
651-104M

8121.MO50

651.104M
8012, 5V

472M
FND51fl2

FNrl5101

FND5101
FNDSlDI

FND5101

FND5101
FND5102

C-237-.1

C-237-.1

C-180-33

C-237-.1

C-237-.1

C-64-1000,

DD-21
DD-20
DO-20

DO-20
00-20
DD-20
DO-21

OS208
DS209
DS210
DS211
DS212
OS213
DS214
DSZi5
DS216
DS217

B Segment Display

LED, Red
LED, Red
LED, Red
LED, Red
LED, Red
LED, Red

LED, Red

LED, Red
LED, Red

514/Gl
514/F4
514/F3
514/F3

514/H2
514lF4
514/G4
514/Hl
514/F3
514fG3

21/c2
22/c2
23lC3
24lC2
25/A3
26103
27fC3
28/A3
29/B3

,3o/c3

F-I
MON
MON
MON
MON
MON
MON
MON
MON
MON

-

FND5101

MV5753
MV5753
MV5753
MV5753
MV5753
MV5753
MV5753
MV5753
MV5753

DO-20
PL-67
PL-67
PL-67
PL-67
PL-67
PL-67
PL-67
PL-67
PL-67

7-4

Table 7-2. Display Board PC-514 Parts List (Cont.1

Circuit

lksig.
DSZIR
OS219
DS220
DS22 1

,DS222

US223
OS224
OS225
DS226
OS227

OSZZR

05229
LS201
R201

Description
LED, Red

LED, Red

I

LED, Red
LED, Red
LEO, Red

LED, Red
ILED, Red
LEU, Red
LEn, kd

LEO, Rfd
LEU, Red
LED, Red
Burrer

10k. 5%. 1/4W, Camp

I

Schematic
Locat ion

514/112
514/F3
514/G3
514/Hl
514tF4
514/G4
514/F3
514/G3
514lF3
514/G3

514/G3

514/H3
514/F4
514/c5

PC-Board

Item No./Loca

31lA3
32lR3
33/c3
34/A3
35/113
36lC3
37lB3
3R/C3
39/R4

'IO/C4
41/84
421C4

51/H3

55102

Mfr.
Cod1

MON
MON
MON
MON
MON
MON
MON
MON
MON
MON
MON
MON
MUR
A-B

Mfr.
Des i g.

MV5753
MV5753
MV5753
MV5753
MV5753
MV5753

MV5753
MV5753
MV5753
MV5753
MV5753
MV5753

PMlZ-6A0

EB

Keithley
Part No.

PL-67

PL-67
PL-67
PL-67
PL-67
PL-67
PL-67
PL-67
PL-67
PL-67
PL-67
PL-67

EM-3
R-76.10k

R202

R203
R204
R205
R206
R207
RZOB
R209
R-210
R211
R212
R213
R214

10k 5%, 1/4W, Comp

lOk, 5%. 114W, Camp
lOk, 59,, 1/4W, Camp
lOk, 5%. llilW, Camp

47, lo%, l/ZW. Comp

47, 10%. 1/2W, Comp
47, 10%. l/ZW, camp
47, 10%. 1/2W. Comp
47, IO%, l/ZW, Camp
47, 10%. IIZW, Comp

47,

lo%, l/ZW, Corn,
47,10%, l/ZW, Camp
47,10%, l/ZW, Comp

514/05

514/05

514IE5

514/F4

514lrll

514lLll
514lCl
514101

514/D

514IEl
514/01
514/01
514/E3

56/E2

57/F2
5BlG2

59jH2
6O/A3
61/A3

62lA3
63/A3
64183

s/o3
66/A3
67/A3
6RlA3

A-B
A-B
A-B
A-H
A-B
A-B
A-R
A-5
A-B
A-R
A-B
A-B
A-B

EB
Er?
EB
ER
EB
ER
ED

ER

EO
ER

EB
ER
EB

R-76-101

K-76-101:

R-76.IOk

R-76-1.5
R-1-47
R-1-47
R-l-47
R-l-47
R-1-47
R-l-47
R-l-47
R-1-47
R-l-47

7-5

Xrcuit
ksig.

?215

Description
47,

10x, l/ZW, ComQ

Table 7-2. Display Board PC-514 Parts List (Cont.)

-

Schematic
Location

514/E3

Item

PC-Board

No./Location

69/D

Mfr.
Code

­A -II

Mfr.
Desig.

ER

Keithley
Part No.

R-1-47
?216
R217

7218 4.7k, 5%, 1/4W, Comp

1219

X220 bBk, 5%, 1/4W, Comp
5201 Switch, Pushbutton
5202 Switch, Pushbutton
5203 Switch, Pushbutton
$204 Switch, Pushbutton
s2n5
SZOB Switch, Pushbutton
5210 Switch, Pushbutton
s211 Switch, Pushbutton
5212 Switch, Pushbutton

47, 10%. 1/2W, Camp

4.7k, 5%. 1/4w, camp

4.7k. 54, 1/4W, Conl,

Switch, Pushbutton

514/E3
514IE3

514lE3

514/E3

514iE2
514/c5
514105
514/u5
514lE5
5l4/C5
514/E5
514/05
514/E5

514/E',

70103
7llC3

72lC3

73lC3

74/C3
RI/II2
RZ/EZ
83/F2
R4/G2
85/02
IIR/GZ
9O/E3

91/F3

92/G3

A-R

RRN

DRN

BRN

RRN

SCll
SCH
SW
XII

SCH

SCH
SC,,

Scti

SCH

ER
CR25,4.7k,

1%. 1/4w

CR25, 4.7k

lo%, 1/4w

CK25, 4.7k

lfl%n, 1.4w

MDP
MUP

M"P
MDI'
MliP
M",'
MOP

MDP

MOP

K-l-47
R-76-4.7

R-76-4.7

R-76-4.1

R-76.68K
SW-435
SW-435
SW-435
SIJ-435
SW-435
SW-435
SW-435
SW-435

SW-435
S213 Switch, Pushbutton
5216 Switch, Pushbutton
5217 Switch, Pushbutton
5218
5219 Switch, Pushbutton
5220

Switch, Pushbutton

Switch, Pushbutton

514/c5
514/E5
514li6

514106

514/06

514lE6

93/03
96/G3
97103
9R/E3
99/F3

lOOIG4

SCH
SCH
SCH
SCH
SCH
SCH

-

MDP
MDP
MDP
MDP
MOP
MDP

SW-435

SW-435

SW-435

SW-435

SW-435

SW-435

7-6

Table 7-2. Display Board PC-514 Parts List NXmt.)

Circuit
Desig.

Mfr.

CO&

scii

I-I

Nil

r-1

,,I,1 ,

I-I
I:

WI

7-7

Table 7-3. Power Supply PC-515 Parts List

Circuit
Desi g.

c301

c302

c303

c304

c305
C306
c307
C3OB

c309

c310

c311

c312

co- 7

CR301

kscription

.Oli,F, 5oov, ccrn

116001~F, 25V, Alum Elect

llfiOn,,F, 25V. Alum Elect

lOuF, ZOV, Tant
lO,,F, ZOV, Tant
lO,iF, 2OV, Tant
l&F, 2OV. Tant
52O,,F, 35V, Electrolytic

620uF, 35V, Electrolytic

68OO,,F, 25V, Alunl Elect

lO,,F, ZOV, Tant

10,li. 2nv, 'rant
3 Wire Line Cord
Rcctificr, Bridge

Schematic
Location

515105

515/E4

515/E4

515/E3
515lE3
515/E2

515iE2

515/E3

515JE2

515/E4

515/E4

515lE4

.-

515/o/1

PC-Board

Item No./Location

3/c5

4lC5

5/c5

6/F3

7lF4
B/F4
9/F4

IO/F5

II/F5

12/G4

13/G4

14/G5

-/A5

17/c4

Ifr.
:ode

­jPG

1IC

IIC

ITT

ITT
ITT
ITT

1IC

?IC

RIC

ITT
ITT

PAT

--

Mfr.
Desig.

B7I-z5uo

103M

HC9-11-11600

25.8P

HC9-11-11600

25.BP
Tap/FOIOF200
Tap/FOlOFZOO
Tap/FOIOFZOO
TapIFOIOFPflO
HC-SC-620

35-RP

K-SC-620

35.8P
HCP-I-6800

25.8P
Tap/FflOFLOO
TaplFOIOF200

--

--

(eithley
?art No.

:-22..Ol

C-314-11600

C-314-11600

c-179-10
c-179-10
c-179-10
c-179-10
C-309-620

C-309-620

C-314-6800

c-179-10
c-179-10

co-7

RF-51
CR302
CR303
F301
F301
J302

J303

5304

5305
5306
5307
P301
P302
P303

Rectifier
Rectifier
Slow 1110~ 250V lA/3AG

Slow Blow 25OV. 1/2A/3AG
Molex
Molex

Molfx

Molex

Filter, Power line

Molex, Male

Molex, Male

515/114

515/1)2
515/w
515/B3
515lC5
5151132
515/F4,5

515/F2,3

515lA3

515K5
515/R2

IBIG
19,G5
ZI/A,B 4
22/A,B 4

_.

--

23/ll3
24lG3

26/B5

27103

28/B5

ED1
EDI
L-F

L-F
MOL
MOL
MOL

MOL

cot

MOL

MOL

PE05
PF-40

MDL
MDL

09-50-3031
09-50-3031

09-52-3102
09-52-3102

6EFl
A-2391-3A
A-2391-3A

RF-48
RF-46

FU-10
FU-4
K-287-3
C-287-3
CS-332-12
CS-332-12
cs-249

cs-249
LF-2
CS-288-3
CS-288-3

7-8

Table 7-3. Power Supply PC-515 Parts List Kkmt.)

Circuit
Oesig.

11301
K302

11303

113”4
113E

53111
s3n2
5303
53n4
7301
VI1301
VK302
VK303

Description
22flk. 10%. lW, Camp

Ik. 10%. l/ZW. Camp

4.?k, 5X, ll4W. Comp
47n, 10%. l/ZW, Camp

'1.2x, sii, 1/41d. camp

Witch 111'0 r
Switch DPDT
Switch SPIIT
Switch, Power

rransformcr
Vnltaqc Regulator. Ilvqativ~
Vnltaqr RCYuldtor, Positivr
vo1taqr IRcqulator. 5 Volt

ichematic

1

acation

T

515/D5

515lE4

515/E3

515,E4
515,FZ
515,CZ
515/C3

-IN2

I!3 1

515/11.2.3.4,5

515/1:3

515/EZ

515/t:3

PC-Board

Item No./Locatior

3ll/C4
31m4

32/F4

33/F4

34/i-4
37lli4
:38/B’,
3'31,13

.~

42/i: .“.,I .5
45li4
4hli4
4 7,E

Mfr.
Code Desig.

A-B GR
A-B CR

RIIN CK25*
A-R ER
RRN
cow
cm1

CaK JMT-123
SCH
K-I
MOT
MOT

MOT MLM103KA

Mfr.

m75*

--

MCIYLICT
MC7815Cl

Keithley
Part No.

R-2-220k
R-1-lk
R-76-4.7k
R-1-470
R-16.4.7k

SW-337

SW39 7

SW-23h
SW-420
TR-175

lC-174

IC-96

IC-98

7-9

Table 7-4. IEEE Interface PC-517 Parts List

:ircuit
lesi g.

:701

:702

:703

:704

:705

:706

:707

Z708

c 709

c710

kscription
.luF, 5OV, CerF

.luF, 5OV, CerF

.luF, 5OV, CerF

.lpF, 5OV, CerF

.luF, 5OV, CerF

.luF, 5OV, CerF

.l,)F, 5OV, CerF

.luF, 5OV, CerF

.lpF, 5OV, CerF

.1uF, 5OV, CerF

r

Schematic
Location

5!7/Al

517lAl

517/Bl

517/01

517/Bl

517181

511lBl

517/Cl

517/Cl

51 T/Cl

PC-Board Mfr.

Item No./Location

3/c4

4/c4

5ic5

6104

7104

H/E4

9/04

IO/E4

ll/F4

12lF4

Code

ERI

ER I

ERI

ERI

ERI

ERl

ERI

ERI

ERI

ERI

Mfr.
Desig.

r

8121.M050­651-104M

8121-MO50-

651.104M

8121.M050­651-104M

8121-M050-

651.104M

8121.MOW

651.104M
8121-M050-

651-104M
X121-MO50

651-104M
RlZl-M050-

651.104w

8121.Mn50-

651.104M

8121.M050-

651.104M

Keithley
Part No.

C-237-.1

c-237-.1

C-237-.1

C-237-.1

c-237-.1

C-237-.1

C-237-.1

C-237-.1

C-237-.1

c-237-.1

c711

c712
c713

5701
R701
s701
u701
U702
u703

u700
u705
U706

.l,iF, 5OV, CcrF

lOuF, 25V, Alum

22eF, 25V, Alum

Right Angle Mount Rect

Thick Film

Dip Switch

Bus Transceivers

Bus Transceivers

Buffer/Line Driver
Bus Transceivers
Bus Transceivers
GPIA

517iCl

517lR6
517/R6

517/G2,3,4,5

517/01
517/El
517/F5
517lF2
517185
517/F4
517/F3

517/E

13/F5

14lG4
15/G5

19/R4
20105
21/85

25/C4

26/D4

27lC5

28lC4

29/C4

3O/D,E4

ERI

ITT
C-I

AMP
RIIN:
CTS
MOT
MOT
MOT
MOT
MOT
MOT

8121.MO50
ii'll-104M

TAPirnln, FZOO
TSO3-lo-336

PCM1287

552791-1
4308R-101-223
206-7
MC344RA
MC3448A

74LS244

MC3448A

MC344GA

68488

C-237-.1

C-314-1(
C-314-22

cs-377

TF-100

SW-377

IC-193
IC-193
IC-230

IL193
IC-193

LSI-14

7-10

Table 7-4. IEEE Interface PC-517 Parts List Khnt.1

Circuit
Desig.

u707

” 708

U7OY
U?lO

u711

VR701

Description

Hex Inverter

Triple-3 Input Nand

Hex-3 state

Quad Bus Rxcivers

Quad iBus Receivfrs
5 "nit Requlator

IRUffW

Schematic PC-Board Mfr.
Location

5, IISEV 31/114 MOT
5, llst~v

517/1)2

‘51 71114
5, 1/112

5, ,,,I6

Item No./Location Code

32lE4
33/F4
14/14
35,,~!,

3 i/G5

MOT
MOT

MOT
MO1

MC r

Mfr.
Desi 9.

741sn4

74,.Sl”

74LS367
YT26
8726

MC IR"5

Keithley
Part No.

IC-186
IC-155
IC-161

IC-IRO

IC-180
IC-93

7-11

Table 7-5. CPU Board PC-518 Parts List

Circuit Schematic
Desig.

c901 .l,,F, 5OV, CerF 51m5 3lR2 ERI 8121-MO50-

c902 .l!J, 5ov, CErF 51HiR5 4lC2 ERI 0121-MO50- C-237-.1

c903 .l,,F, 5OV, CerF 51RIt35 5lC2 ERI 8121.M050- C-237-.1

c904 .luF, 5OV, CerF

c905 .l,,F, 5OV, CcrF

C906 .luF, 5OV, CerF 51ii/n5 8/F2

c907 .luF, 5OV, CcrF 518/115 O/B2

C908 .luF, 5OV, CfrF 518/r% lO/RZ

c909 .luF, 5OV, CerF 518/05 II/U2

c910 ZZpF, lOOOV, Cer" 518/W 12/02

Description Location Item No./Location Code Desig. Part No.

SlR,iiS

51R/B5 7IF2

PC-Board

b/E2 ERI RlZl-MO50- C-237-.1

Mfr.

ERI 0121.MO50- C-237-.1

ER I HlZl-MO50- C-237-.1

ERI X121-MO50- C-237-.1

ER, 8121.M050- C-237-.1

ERI 8121.MO50- C-237-.1

EilI 838-000-u230-

Mfr. Keithley

C-237-.1

651.104M

651.104M

651.104M

651-104M

651.104M

651-104M

651.104M

651.104M

651-104M

C-64.22pF

22OK

c911 22pF, 1ooov, ceru 518/112 13/02

C912 .luF, 5OV, CerF 5lH/D2 14lF2

c913 .l,,F, 5OV, CerF 518/C5 15/A3

c914 .l,,F, 16V, CerD 51H/D2 16/B3
c915 .OluF, 16V, Cern
C916 .luF, 16V, CerD
c917 .l,,F, 5OV, CerF

CY18 2211F, 25V, Alum
c919 .luF, 5OV, CerF

c920 .luF, 5OV, CerF

c921 .l\f, 5OV, CerF

51WE2 17/R3

51H/E2 1x/03

51RIC5 19/03

518/A5 20/113

SlS/CS 21/E3

518/C5 22lE3

51w5 23/E3

ERI 83X-000-11250

ERI HlZl-MO50- C-237-.,

ERI

CLB UK16-104
CLR UK16-103 C-238-.0:
CLR UK16-104 C-238-.1
CLR

ITT

CLB H121-MO50-

CLR 8121-MO50-

CLB

220K

651.104M

8121.MO50
651-104M

RIZI-M050- C-237-.1

651.104M

TAPIFOZZ, FZOU C-314-22

651.104M

651-lg4M
8121~MO50

651.104M

C-64.22Pf

C-237-.1

C-238-.1

C-237-.1

C-237-.1

C-231-.1

7-12

Table 7-5. CPU Board PC-518 Parts List (Cont.1

Circuit

Desig.

c922

c923

c924

'CR901

R9Ol
R902
Rg"3

u901
u902

u903
u904
u905
U906

Description

.luF, 5DV, CerF

lOuF, 25V, Alum

.iuF, 5OV, CerF

Diode, Silicon
Thick Film

lM, 5%, 1/4W, Comp

lM, 5%. 1/4W, Camp
Buffer/Line Driver
Dual 4 Jnput Nand

Dual 4 Input Nand

Triple-3 Input Nor

Microprocessor with clock
PROM

schematic

I

acation

518/E 24/F3 CLB

PC-Board

Item No./Location

t

51H/R5

518/C5

518/E1

518/A,B
518/El 41/A3 MEP
51R/E2 42/R3
518/C4
518lB3.4
518/05,6
51R/D4,6
518/D1,2,3,4
51R,F4

25103 C-I c-314-11

26/E3 CLR C-237..

32/A3 T-I

4O/C2 RRN

h5lA2 YOT IC-230
66/52 YOT IC-232
67lC2 YOT IC-232
6RIC2
69/D,E,2 YOT LSI-27

70/E? INT

Mfr.

Code

T

Mfr.

Desig.
8121-M050-

651-10411
TSO3-IO-336

PCM-1287

8121.M050­651-104M

IN914
4306R-101-332

CR25*

MEP R-76.1M

YOT

CR25*

74LS244

SN74LS20
SN74LS20
SN74LS27
MC6008
2716

Keithle:
Part No

C-237..

RF-28

TF-101

R-76-1M

IC-233

*i

PRO-114

u907*

uson
1,909
u910
u911
u912

u913

u914
u915
U916

u917
U918
u919

PROM
Buffer/Line Driver
Hex 1nvcrter

Iriple-3 Input Nand
Hex-3 State Ruffer
Quad-2 Input Nand
Programmable Module Timer
Decoder/Multiplexer
PROM
Quad-2 Input Nand
Timing Circuit
Quad Bus Receivers
Static RAM

51D/E4
518/C3
518/SEV 73lR2 4OT

51X/05
518/C5

518/SEV
51X/02,3
518/04
518/F3

518/SEV
518/E2
518/C2
51t3fE2

7llF2 INT PRO-II;'

72/A2 YOT IC-230

74lC2 T-l IC-155
75/A2

76182

?7/C3
78/C2 SIG IC-190

79lF2
DO/A3 ti"T IC-231
al/B3 SIG IC-71
82/C3 SIG IC-180
83fE3 VEC LSI-15

--,

4OT
+lOT LSI-26

INT

2716

74LS244
74LSO4
74LS14

74LS367

74LSOO

MC6R40

SN74LS139

2716

SN74LSO3
NE555
8726
2114

IC-I56

IC-161

IC-163

PRO-115'

*Manufacturers Designation includes parts description, e.g., CR25, lM, 5%. 1/4W, Comp, and R903.

**Order same as current software level displayed on power-up. For example, if Cl is displayed, order PRO-1 14X1.

7-13

Table 7-5. CPU Board PC-518 Parts List (Cont.1

Circuit Schematic
lesig. Description

J920 Static RAM 518/El

u921

u922 Static RAM 518/F2 86/E3
u923
u924*
VR201 5.Volt Regulator 518/E3
VR901 5-Volt Regulator 518/85

Y901

TPI Test Point E5 48102
TP2
TP3 Test Point E5 SO/D2
TP4
TP5
TP6 Test Point C6 53/C2 K-I

Quad Bus Receivers

Static RAM 518/Fl 87/E3

PROM 518/E3

4MHZ Crystal

Test Point E5

Test Point F5
Test Point

Location Item No./Location

51R/Cl

518/02 llllE2 CTS MP040 CR-10

E5 52103 K-l

PC-Board Mfr. Mfr.

84/E3 NEC 2114

85/C3

88/F3 INT 2716

93/D3
94/03 MOT MC7805

49102 K-I c-339-4

51102 K-I

Code Desig.

SLG
NEC 2114
NEC

MOT

K-1 ___

K-, ___

8T26

2114

MC7805

Keithley
Part No.

LSI-15

IC-180
LSI-15
LSI-I5

PRO-l15*

IC-93

IC-93

cs-339-4

cs-339-4

cs-339-4
24249A

cs-339-Z

TP7
TP8
TP9
TPlO
TPll
TP12
w901
w902
w903 Jumper 06 99/62
w904
w905
W906
w907
W908 Jumper
w909 Jumper

*Populated in PC-518 when 11906 and 11915 are 2716's.

Test Point C6 54/c3 K-I

Test Point 65 55102
Test Point 65
Test Point

Test Point 61

Test Point 82 59/c3

JUmpW

JUllpW

Jumper

JUmpW

JUllpW

Jumper

A2

G4 97102

D5

05
D5
E5 102/62 J-3
06 103102
65
G4 105lF3

56/02 K-I c-339-2
57/n
58/C3 K-I cs-339-3

98102

loo/c2 J-3
lOl/C2 J-3

104/83

cs-339-2

K-I cs-339-2

K-l es-339-z

K-1 -_-

___ _-­__. .._

___ ___
___ ___
__- -._

cs-339-3
J-3
J-3
J-3

J-3
J-3
J-3

Table 7-8. Isolator Board PC-519 Parts List

Circui.
Desig.

CEO1

C802

CR03

C804

LB05 .l,,r, 5ov, cd

:806 .luF, 5OV, CerF

XXI7

308
x09

2310

Description

.l,rF, 5OV, CerF

.luF, 5OV, CerF

.luF, 5OV, CcrF

.luF, 5OV, CcrF

22uF, 25V, Alw

.luF, 5OV, CrrF

.I,rF, sow, Cerl

Schematic
Location

519/Rl

519/81

519/Rl

519/Bl

519/Rl

519/Rl

519/ill

519/Al

51OiG5

519/m

PC-Board

Item No./Locatior

3lR2

41112

5jl32

6lR2

7182

ii/l32

9/c2

lO/C3
II/F2

12/E2

Mfr.
Code

­ERI

ERI

Et?1

ERI

ERI

C-I

ITT

EKI

EKI

Mfr.
Oesig.

8121-M05D-

651.104M

8121.M050-

651.104M

8121.M050-

651.104M
8121-M050-

651.104M

8121.MD!&

651.1114~
RlZl-M050-

651.104~

7503.IO-

336, PCM12R7
TAD/FOlfl, F200
RlZl-MD50-

651LlO4M

8121.M050-

651.1114M

Keithley
Part No.

c-237-.1

c-237-.1

c-237-.1

C-237-.1

C-237-.1

C-237-.1

c-314-10

C-314-22
C-237-.1

C-237-.1

-

Xl1

:812

:813 .l,,F, IhV. CcrD
:814 .l,lF, 168, tern
:815 . I,5 , 16V * cero
:R16

x17

X18
:819

:R801
:R802
:R803
:R804

.l,,F, sov, CerF

.l,,F, 5OV. Ccri-

22uF, 25V, Alun,

.l,,F, 5OV, CerF

.luF, 16V, CcrD
.l,,F, 5OV, CerF

Rcctificr
Rectifier
Kcctifier
Rectifier

519/a

519/E

519/E5
519/E4

519113

519/G5

519/G’,

519/E2

519/111

519lAb
519iA6
519/A6
519/A6

13/E2

14lE2

19/F2

2O/F2
21/c3

79/D2
110102
RI/D2

82lD2

ER,

ER I

ERI

CL0
Eli I

T-I
T-I
T-I
T-I

iilZI-MO50
651-lfl4M

RlZl-MD50-

651.104M

UKl6-104
IJKlG-104
"KlG-104

TSU3-IO-

336, PCMlZI37
8121-M050m

651-104M
IIK16-104

8121.M05fl-

651.104M

lN914

IN914

lN914

lN914

C-237..

C-237-.1

C-238-.1
C-238-.1
C-238-.1
C-314-22

C-237-.1

C-238-.1
C-237-.1

RF-2R
KF-28
RF-28
RF-2R

1

'801

1801

I802

connector

Thick Film

270. 5%. 1/4W, Camp

519/A
519104

519/E3

23/G2

25/B

26/F2

3M

1

i1R N
IjRN

3429.2002
430, RRlOl-223
Cl<25*

CS-322-26
TF-100

R-76-270

z

7-15

:ircuit
big.

lescription

Table 7-6. Isolator Board PC-519 Parts List ICont.)

l-

<

Zhematic

1

mation

PC-Board

Item No./Locat.ion

Ifr.
:ode

Mfr.

Desig.

Keithlq

Part No.
1803
:804
\805
1806
(807
1808
1809

la10

$801

JUOI
J802
J803
11004
J805

!70, 5x, 1/4w, camp
270, 5%, 1/4W, Comp
390, 54, 1/4W, Comp
390, 5%, 1/4W, Comp
390, 5%, 1/4w, Comp
IOk, 5X, 1/4W, Comp
390, 5X, 1/4W, Comp
270, 54, 1/4w, camp

Switch
HEX 1nvertcr

Decoder/Multiplexer
Ruffcr/Linc lirivcr

Triple-3 Input Nand
Quad Rus Receivers

519/G!
519114

519/Dl
519/E4
519/E3

519/F]
519lE2
519/Ei

519lD3

519/SEV

519iA5

519/A4

519/SEV
51')/A2

21/F2

2R/F2

29/F2

3O/F2

3I/F2

32/F?
33/F2
34/F2

39/Rl

43/A2
441A2

45lA2

46/R2
47fR2

1RN
IRN
IRN
INN

RN
RRN
RRN
RRN

Gilli
MOT

SIG
MOT

T-I

SIG

CR25*

CR25*
CR25*
CR25*
CR25*
CR25*
CK25*
1X25*

76SR04
74LSO4

SN74LS139

74LS244
74LSlO

0726

K-76-27(
R-76-271
K-76-391
R-7b-391
R-76-391

K-76-101
R-76-391
R-76-271

SW-422

IC-186
IC-190

IC-230

IC-155
IC-la0

U806
UH07

UBO8
U809

LIB10

U811

U812

U813
U814

U815

U816

*Manufacturers Designation includes parts description, e.g. CR25, 390, I%, 1/4W, Camp for R810.

Quad Bus Receivers
Versatile Interfacr Adapt?

Shift Register

Quad-2 Input Nand

Quad-2 Input Nor
Odd/Even Parity Generator

Checker

Shift Register
Quad-2 Input Nand
Odd/Even Parity Generator

Checker

Shift Register

&Bit Parallel Serial Cow

r

519/A3
519/C
511/1)2

519/SEV
519/w
519iF3

519/F3
519/w

519/F4

519/F2
519/FI

48/112
49K2
so/c2

51/C2
52/02
53102

54102
55/E2
56/E2

57lE2

58/F2

SIG
SYN
T-I
T-I
SIG
T-I

T-l

T-l
T-I

T-l
MOT

8'121,
SYP6522
SN74LS164
SN7400N

74LSO2
74LS2RO

SN74LS164
SN740ON

74LS280

SN74LS164

74LS165

IC-IlNl

LSI-28

IC-L27
IC-38
IC-179

IC-236

IC-I27

IC-38

IC-236

IC-127
IC-237

7-16

Table 7-6. Isolator Board PC-519 Parts List ICont.)

Circuit
Desig. Description Location

AT1 Opt0 Coupler 519/E5
AT2 opt0 Coupler
AT3 Opt0 Coupler
AT4 Opt.0 Coupler

VRROl 5 Volt Regulator 519m2

Schematic

519lE4

519lE3

519iCl

PC-Board Mfr.

Item No./Location Code Desi g.

Gl?/FZ H-P HCPL-2601

69/F2

7O/F2

71/G2 H-F

75lD2

II-P CCPL-2601
H-P HCPL-2601 IC-239

F-I

Mfr. Keithley

HCPL-2601

Sli323SC IC-240

Part No.

IC-239

IC-239

IC-239

7-17

Table 7-7. A/D Converter PC-520 Parts List

Circuit
Desig.

c501
C502

c503 .l,,F, IGV, CcrD
c504 .luF, 16V, CerD 520/H5 h/E2
c505 .l,,F, 16V, CerD
C506 .LpF, 16V, CcrD 520/F] R/C3
c507 lOOpi, IOOOV, CerD 52D/Gl 9lC3

C508 .luF, 16V, CerD 52O/Gl IO/C3

c509 IDDpF, lOOOV, CcrD 520/F2 II/C3

c510 .luF, 16V, CcrD 52D/El 12/D3
c511 .luF, 16V, CerD 52D/H5 13lD3
C512
c513 .l,,F, 5OV, CcrF
c514

Description

.luF, 16V, CerO 520/115 3/u%

36OOpF. lOflOV, CcrD 520//E 4/c2

.luF, 5OV, CcrF 52O/H5 14/E2

.luF, IhV, CerD 520/H', 16/E3

Schematic PC-Board
Location

520/H5

520/H!,

520/H5 15/E2

Item No./Location

5iEl

7iF2

Mfr. Mfr.
Code Desig.

CLR UKIG-104
CLD 5% MAL C-138.36DOpF

CLR UK16-104 C-238-.1
CLB tlK16.104
CLB UK16-104 C-238-.1
CLR UK16-104 C-238-.1
CRI. 00-101 c-64-1OOPF
CLR tlK16-104
CRL DD-lnl C-64.100pF
CLR UK16-104 C-238-.1
CI.R UK16-104 C-238-.1
El< I 8121M050651104M C-237-.1
EKI
CLR UKlb-104 C-238-.1

36OOpF

8121M050651104M C-237-.1

Keithley
Part No.

C-238-.1

C-238-.1

C-238-.1

L501 Choke 52fllFl 19IC3 NYT SWD-100
q501 N-Channel J-FET
q502 Transistor Array
4503 NPN Transistor 520/A3 23/C2
q504 PNP Transistor
4505 PNP Transistor 52fl/Rl 25/R2
Q506 PNP Transistor
4507 Transistor Array 52D/Cl 27lC2
QSOU N-Channel J-FET 520/Gl 28lC3

4509 NPN Transistor 520106 29/E3

0510

R501 Thick Film 52O/Several 33102
R502 Thick Film
R503

PNP Transistor 520182 30/Rl

6.8M, IO%, 1/4W, Comp 520105

520/l?& 211131

520/4A 22/c2

52O/A2

52O/Cl 261132

520/Several 34/C2

24IC2

35/83

INT
K-I 29190/l
MO'I 2N3904

F-l
F-I 2N363RA TG-84
F-I 2N3630A
K-I 29198A 29198A

INT ITE4392 TG-77

MOT 2N3904 TG-47
F-I 2N3638A TG-84
OLE TF-06 TF-86
DLE TF-85 TF-85
DLE

I~TE4392

2N3638A

CK25* R-76.6.OM

u-14
TG-77
2919RA
TG-47
TG-84

TG-84

7-10

Table 7-7. A/D Converter PC-520 Parts List ICont.1

Circuit
Desig.

R504
R505
R506
R507
R508
R509
K510
11501

U502
u503
u504
11505
U506
u507

Description

4.99k, 146, l/BW, Fixed
33On. 5%. 1/4W. Comp
3300, 5%, 1/4W. Comp
22n, 54, 1/4W, Camp 52ll/GI

IOM, lo%, 114W, Camp 520/F2

6.8, 5%, 1/4W, Comp 52niEI

lOK, 5%, 1/4W, Conp 52O/C6
Iji-Fct OP AMP 5201Ah
Triple-3 Input Nand 52D/D3
Flip-Flop 520/E3
Triple-3 Input Nand
Ufcade a Binary Counter 52OlF4
Flip Flop 520/R3
iii Fet OP AMP 52O/A3

Schematic
Location

520/R6
520/F2
52O/Fl

52O/H5

PC-Board

Item No./Location

36/H3
37/113
38lR3

39/c3
4lllC3
41lC3
42/E2

471111

4x/01

49/01

ill/El

51/Fl

52lR2

53,CZ

Yfr.
Code

DLC
DRN
RKN
RRN
RRN
RRN
RKN
NAT
MOT
T-I
MOT
T-I
T-I
NAT

Mfr.

Desig.
MFFI/R
CK25*
CR25*

CK25*
CR25*

CR25*
CR25*

LF351N

741.510
74LS74

74LSlO

7415393
SN74574N
LF351N

Keithley
Part No.

R-"&4.99

R-76-330

R-76-330

R-7G-22
R-76.IDM
R-76-6.8
R-76-6.11

IC-176
IC-155
IC-144
IC-155
IC-213
IC-216

IC-176
U508
u509
U510
U511
U512
u513
u514
u515
U516
u517
U518

U519
VR501
Y501

*Manufacturers Designation includes Parts Description - e.9. 1X25, 22, 5%, 1/4W, Comp, R507.

Quad Z-Input Nand 52OlSever
UP/DOWN Counter 52",F5
UP/DOWN Counter
Decade o Rinary Counter 52OlD4
tiuffcr/Linc Driver 52OIEh
Quad Z-Input NOR 52O/Sever
Ri Fet OP AMP 52O/Bl

Voltage Comparator

UP/DOWN Counter

Flip Flop
Decade CI Binary Counter
Buffer/Line Driver
Zener Diode
Crystal

520/G5

52il/C2

520,Fl

52O/E6
52U/U4
520/05
52O/A6
52O/Fl

541112
55,E2
56lE2
51lE2
58lF2
59182

6fl/R2
61/C2
62103
63/E3
64/F3

65/F3
69/A2

72/C3

MOT
T-I
T-I
T-I
MOT
SIG
NAT

NAT
SIG
MOT

T-I
MOT

SIE

BOM

lill~SO0
SN74LS193
SN74LS193
SN74LS393

141.5244
74LS02

LF351N

LM3liN

N74193R

74LS374

74LS393
74LS244

lN4511

BM-22

IL-163

IC-214
IC-214
IC-213
IC-230
IC-179
IC-176
IC-173
IC-44

IC-242

IC-213

IC-230

LIZ-60

Cl<-12

7-19

Table 7-8. Electrometer Module PC-523 and PC-522 Parts List

Circuit Schematic PC-Board
lesig. Description Location Item No./Location

C601 lOuF, 35OV, Alum Elect 5221'2 3/E2 NIC 350-E-NA-10-T C-312-10
C602
cfin3 4.7,1F, 35OV, Alum Elect 522lH2
C604 4.7uF, 35nV, Alum Elect
CGO5
C606
C607 47OuF, 16V, Alum Elect 522lC3 9/E2 NIC IIC-4c-470.16.BP c-313-470
CGO8
C609
C610 .Ol,,F, 5OOV, CcrD

CG51 15QF. 5OOV. Polysty 5231114 31113 MAL 15nPFSX
C653

CG54 lO,,F, 2OV, Tant 523/1)2 6102

InuF, 35OV, Alum Elect

.l,,F, 25OV, Met Poly

47011F, 16V, Alum Elect

25OuF, 25V, Alum Elect
25ouF, 25V, Alum Elect 522lC4 ll/E3 IRIC IIC-4B-250.25.RP C-314-250

.047,,F, 25OV, Met, Poly 523/112 5/112 MEP

522/C3 4/i? NIC 350.E-NA-10-T C-312-10

5/E2 ucc
522/B3 K/E2 IJCC 350VB-4R7 C-240-4.7
522/113

522/u n/E2 Nil:

522/C4

52%/C4

7lll2

IO/E3

12/E3

Mfr.
Code

MEP

RIG

SPG

ITT

Mfr. Keithley
Desig. Part No.

35OVB-4K7

C2ROAE/P10nK C-178-0.1
HC-4C-4/O-lG-BP C-313-470

IIC-4R-250.25.BP C-314-250

5GA S-SIO .OlmF C-22-.01
20%. 5nov

106,.047,FU, C-l7R-,047

25nv, 2na
TAP/F, 35V, 20% C-179-10

C-240-4.7

C-138.15Op

C655
C656
CG57
C658
C659
C660
CGGI

C662

C663
C664

47pF, 5OOV. Polysty 523/n3 7/C2 MAL 4 7mmf 5 X
5OOOpF, 5nOV, Polysty 523/113 8/C2 MAL 5flflflPF SX
47pF, 5OOV, Palysty

lOpF, 5noV, Polysty 523iC5 loin3
l"uF, 2OV, Tant 523/n3 ll/C3 ITT
lOtiF, ZOV, Tant 523/03 12/C3 ITT

.OluF, 5OOV, CerlJ 523/C4 13/c3 SPG

.ol~F, 5OOV, CcrD

loaf, 2OV, Tant 523/113
l"uF, 2OV, Tant 523/F5 16/G2 ITT

523,113

523lC3 14/03 SPG

!l/R3 MAl. 47mmf SX

MAL 20mmf SX

15IF3 ITT

TAP/F, 35v, 20% c-179-10
TAP/F, 35V, 20% C-179-10
5 GAS-Slfl,

20%. 5OOV
5 GAS-Sl",

28%. 5onv
TAP/F, 35V, 20% C-179-10

TAP/F, 35V, 20% C-179-1"

C-138.47p

c-13~-5000~

C-13B-47p

c-138-lop

.Olmf c-22-.01

.Olmf c-22-.01

7-20

Table 7-8. Electrometer Module PC-523 and PC-522 Parts List (Cont.)

Circuit Schematic PC-Board Mfr.
Desig.

C665 l,,F. 5OV, CerF 523lC4 17lC3

C666

CbG7 .oni,,r 523lC5 13/U
C668 .OOl,,F

CR601

CR6112 llcctificr 522lC2 lli/P'Z
mm3
CRGU4 Rectifier 522/G3 Zl/li?
CK6i15
CR 61)G llfctificr 5?2/03 ?3/02
CR607 Rectifier 522lr3 24/02
CKh08
CilS"Y

Description Location

00 1 ,I/_

Diode, Silicon 522/03

l)iodi~, Silicon

RC!Ct,fier 522103

Rectifier 522/F3
ilcctifiw

523lG5

523iGS

522IF2 zfI/ltz

522/C2 26/El

Item No./Location Code Oesi g.

EMC 50 30 E 850 C-237-1.(

13lC3

lU3lC3

l:l/M

22/K'

25/D2

ERI 808.000.ZSRU c-22-.001

ill1 c-22-.001
Eil I

r-i

ITi SIX RF-38

T-I

,rT
ITT
ITT
ITr
ITT
ITT

Mfr.

K"l"5M

10%

IN914

lN914
5 I ii
SIR
SIP'
Slil
SLil
SIR

Keithley
Part No.

c-22-.001
RF-28

RF-28
RF-38
RF-38
RF-38
RF-38
RF-38

RF-38
CRhiO Itcctif~lcr 522/C3 27/C2
CR611 llectificr 52?/C3 211lF2
CR612 Ilcctififr 522lC3
CR613 llectlficr 572/n2
CR614

CR615

CK616 Diode, Silicon

Cl261 7
CKGlR
CR61’1

CRhZC
CRh21

CRh22 Oiodo, Silicon 522m

CR623
CRh24 Rectifier 522lC4 ‘Ii/E2

CK625 Rectifier

IIOCtifiPr 522/FZ
Diode, Silicon 522/O% 32/113

522/E2
IOiodo, Silicon 522K2 34/113
Diode, Silicon 522iE2

Diode, Silicon 522/F%

Diode, Silicon 522/E2 37/R3
Oiode. Silicon 122lG2 3ii/C3

Oiode, Silicon 522/G2

522lC4

29/E2

31,,K2
31/R2

33/R3 T-l

35/R3 T-l
36/113 T-I lN914 RF-28

39K3 T-I lN914 RF-28

4wc3

42lE3

lli
ITT SIX RF-3R
ITI
ITT

ITT

1-i IN914

T-I

T-I lN914 RF-2f!
r-1

T-I
EOI
EOI

SIX

5 I R RF-38
SIR

5 , ii

lN914
IN914
IN914

lNY14

1914
PF4:l RF-46
PF-40

RF-38

RF-38

RF-3R

RF-28
RF-28
RF-2R
RF-28

KF-28

RF-28

RF-46

CRh52

Diode, Silicon 523lF4

24/02 r-1 IN914 RF-28

1-21

Table 7-8. Electrometer Module PC-523 and PC-522 Parts List (Cont.1

Circuit
Desi 9.

CR653
CR654
CR655
CR656
CR657
CR658
CR659
CR660
CR661
CR662
CR663
CR664
F601
5601
5602
J651
J652

Description Location Item No./Location Code
Diode, Silicon
Diode, Silicon
Diode, Silicon
Diode, Silicon
Diode, Silicon

Diode, Silicon

Diode, Silicon

Diode. Silicon

Diode, Silicon

Diode, Silicon

Diode, Silicon

Diode, Silicon
Fuse, 2 AT
Bindin Post. Ilrd -/I15
IiindiniJ Post, Black
Jack, Triax -l/Ii
Connector. Microphone

Schematic PC-Board Mfr.

52310
523/E5
523/F4
5231F4
523/Fl
523lF2 3",E3
523/F%
523iF2
523/F3
5231F3
523/F3
523,F5

-/I15

-/I15

-/Al

25lD2 T-I
26/D2
271113
28lE3 T-I
29/113 T-I

3 II113 T-I

32lE3
33lE2 T-I
34/F% r-1
3511~2
x/r2

--

--

-­.­.-

T-I
T-I

T-I

T-I

T-I
T-I
t-r
SllP 1517
5111'
I'OM
IvlP

Mfr.
Desig.

lN914
IN914

lN914

IN014
11:914
lilc)14

1Nii I4

I WJ I? lRF-2n
lb1914
lNOl4
IN014
lN914
312002

I~F-21-XC

3wn
ilrlPC?F

Keithlej
Part No.

RF-211
IIF­RF-2R
RF-2R
RF-2ii
lRF-28
RF-28

,RF-zn

lli-28

IRF-2fl

IRF-28
FU-13
iiP-,,-2

BP-,I-"

CS-253

CS-32
K601
(602 Relay
K603
1651 Relay
K652
(653 Relay 523/113, F2
K654
(655
<656
(657 Relay 523/B2, F4
(658
(659
(660 Relay 523104, F2

Relay 522/1;3

522lG3

Relay 522lG2

523/112. F1

Relay 523/R3. Fl

IRelay
Relay 523/02, 14
Relay 523/R5, F4

Relay 523/C3, E5
Relay 523/C2, F4

523/R3, F2 46/R2

49/c3 COT

in/c3 COT

51/c3 CnT
431112 COT UF40117 RL-64
44/w COT ur4nli7
45lB2 COT

COT
47/n3 COT UF4Dll7
4RIB3
49in2 COT
!x/D2
51/D2

52/E? COT lUF4flllR

COT

COT

COT

UT45ll2 I
llT45fl27
llF4ill IR

11140117

UF40117

Ul~4fl117
lUF40118
UF40118
UF4011R

RL-66
RI.-66
IIL-65

RL-64
RL-64
RL-64
RL-64
RL-64
RL-65

RL-65
RL-65
RL-65

Table 7-8. Electrometer Module PC-523 and PC-522 Parts List ICont.)

Circuit
Desig.

K661
K662
Q601

Q602
4603
0604
Q605
4606
0607
(I608
4651
R601
R602
R603

Description
Relay

Relay
Transistor, NPN, TO-5
Transistor, PNP, TO-5
Transistor, NPN, TO-5

Transistor, PNP, TO-5

Transistor, NPN, TO-92

Transistor, PNP. TO-92

Transistor, NPN, TO-92

Transistor, NPN, TO-92
Transistor, NPN, TO-92
33Ok. lo%, l/ZW. Comp
330k, IO%, l/ZW, Comp

lOk, 5%. lOW, MtF

Schematic
Location

523lD5, F

523/05, E
522103
522/F3
522lD3
522/F3
522lE3
522lE3
522/112
522lH3
523/G5
522lC2
522/G2
522/E3

PC-Board

tern No./Location
3
3

53lF2

54/F2

571~32

58lR2
59lR2
60/02

61/H3

62103
63/03
64103
58/E2

lo/AZ
71102
72/c2

Mfr.
Code Desig.

COT
COT
RCA
RCA
RCA
RCA

F-1

MOT

F-l
F-I
F-I
A-R
A-B

SPG

Mfr.

UF40118

UF40118
2N3439

2N5416
2N3439
2N5416
2N3904
2N3906
2N3904
2N3904
2N3904
En
ER

456E1035

Keithley
Part No.

RL-65
RL-65
TG-93

TG-105
TG-93
TG-105
TG-41
TG-84
TG-47
TG-47
TG-47
R-1-330k
R-I-330k

R-133.IOk
R604
R605
R606

R607

R608

R609
R610
R611
R612
R613
R614
R615
R616
11617
R618
R619

lOk, 5%. lOW, MtF

.I, .I%, 7.5w. ww

330k. 10%. 1/2W, Comp

IOk, 5%. 1/4W, Comp

330k, 10%. 1/2W, Camp

IOk, 5%, 1/4W, Comp

470, 5%. 1/4W, Comp

680, 5%. 114W. Camp
47, 5%. 1/4w, ColrQ

23.1, I%, l/UW. MtF

2.4k, 1%. 1/8W. MtF

23.7, 1%. l/UW, MtF

47. 5%. 1/4w, corq
Zk, l%, IIUW, MtF

47.5%. 1/4w, camp

47.5%. 1/4w, camp

522/E3

522lE5

522102

522/D2
522lF2
522/F2
522/H3
5221H2
522lE3
522lE3
522lC3
522/E3
522lE3

522lF3

522lE3

522lE3

73/C2
74/C2
75lA2
lhlA2
77182
78/02
79103

RrJ/U3

8l/R3

82/B3
83183
84/83
851113
86/03
87103
87103

-

SPG

TEL
A-ii
MEP
n-n

MEP

MEI'

MEP

MFP

DLI

DLF

IDLE

MEP

01-E
MEP
MEP

456E1035
PER SPFC

CR
CH25, 5%
10
CR25, 5%
CR25
CR25, 5%. 600
47, 5%. 1/4w
MFF, l/RT-1, 14
MFF, l/R
MFF, l/BT-I, 14
47, 5%, ll4W
MFF, 1/8T-1, 19

47, 5%. 1/4w
47, 5%. 114w

IOk

IOk

R-133.IOk
R-262-0.1
R-l-330k
R-76.10k
R-l-330k

R-76-10k

R-76-410

R-76-680
R-76-47
R-88-23.7
R-88-2.741
R-88-23.7
R-76-47
R-88.2k
R-76-41
R-lb-47

7-23

Table 7-8. Electrometer Module PC-523 and PC-522 Parts List (Cont.)

Circuit Schematic PC-Board Mfr.
Desig. Description Location

R65l 10, lO%, 1/2w 523/112
11652 zno, IO%, 1/2w
11653 5k, 10X, 1/2W
Rh54
11655 5k, lox, 1/2w 523/1Vl 6?/C2 illi /I
lR656 5k, lfl%, 1/2W
iR657
11658 97.6.
IRh59 IOk, .I%, In,.,, WI.,
IRhhO
11661 4.7k, 5%. i,',li, Co,np i2 3,113 13/v ME,'
R662
K6G3

In654 LOk. ,'A, ,/:iW, Mt,

2M, 10%. l/214 5231113 hf~lC2 RR N

50, In%/,, 1/2w 523/C2

.I%, l/ZW, MtF 523/112

998k

, .I%. l/41.1. r,ti ?23/R3 17,cz

99M,

.5'1, 1/4w, MPt nx 523/113

').RG, 2%. l.%l, ilioxy C"dtwl 523,!14

523IB2 hiilC2 PI? N 338611-1-201
523/113 6 i/C 2 RRN

523lC5

'123/112 II/S% Tii~

523iR4 lOll(3 ,I,~,-

Item No./Location

h3/C2

h:t,n%
h'l,::%

m,r:;l

74/C? Vi11
i!,lG i: /In

Code
RR II

ill?N
131th
!lL1

Ail

Mfr.
Desig.

3386H-1-1nO

3313611~l-502 RP-Ill-Sk
338R6H-1-2X RP-Ill-2M
3313hH-l-502
33R6H-l-In3

33fw-i-500
CMF l/4 R-169-97.6
24117

-.

c1125* 11.76.4.7k

-­.-

Elii;. 1%. i/w R-8%lnk

Keithley
Part No.

RP-111-10

RP-Ill-200

RP-ill-Sk
RP-Ill-lnk
RP-Ill-5fl

K-221.lflk
R-264.99Rk

R-269.99M
R-289.9.8G

I(665
R666 90.9k. 1%. llilbl, !ll:F 523lCil /X/C3 ll,~i
11667 lllk, 5%, l/411, COII~~
11668 11.1, l%, l/.iJW, i4ti 523/115 !ll1/!13
KG69
R67"
R671 6.49k. 1%. l/iiii, MtF 523/n%
R672 SclcclEd 1%. l,iill, ,.,ti
K673 2.l5k. 14, i/inW, PltF 523/C2 115/113 AC1
R674 1106. 1%. l/iiW, I‘,ti
R675 IOk, I%, I/&d, Mti
R676 lilk, l%, l/81,1, MtF
RG77 3.65, 1%. l/&d, MtF
lR678 lk, 5%. 1/4bl, Camp

499k. I%, l/!iW, Mti~ ',%3/115 1 ,,I\.3 1~1~1

523lC4

lflk, 5%, 114W, Con{~ 523/c4 8llC3 MEP c1125*

402, .1X. Illn11. MtF !,23/C2 r~2,1,2 TRW

523fC2

523/D?

523163 ii 71113

523/C3 PA/D3

523lD2 89ID3 DLE

523/&l 9n/C2 MEP

70/1:4

f13/1)3 Ill~E
84,"3

M/D3

:NcP c1125*

IlLI MFI, l/i<

lllki CMI~ ,R-OR-*

IDLE
rl1.E CMF, l/O R-8R-lnk
IDLE

blii, l/10 R-88.499k
CMF. l/Ii1 K-88.90.9k

R-76.10k
R-8%1M
R-76.10k

.-

CMF, l/10 R-RB-6.49k

Metal Film, l/l0 R-263.2.15k

CMF, 1110 R-88-806

CMF, l/R R-X8-10k
CMF, l/D R-88-3.65
CR25* R-76.lk

R-263-402

7-24

Table 7-5. Electrometer Module PC-523 and PC-522 Parts List (Cont.1

Circuit
tlesig.

K679 5k, lo%, 1/2W
KU30
R6Rl
RliR2
R6113
R6H4
R6R5
R6RG
il 68 7 lk. 5%. 1/4W, Ccq
lR61111

rfin1
lUGi, OP AMP, Tn.99 '123/c4
11652

11653

Description Location Item No./Lacation Code Desig. Part No.

500, lo%, 1/2w 523/E5 92/F2
iOk, .I%, l/ZW, Comp 523/E5 93lF2

898k, .I%, 1 1/4W, Camp 523lE4 94lF2 PRP

89.8k. .1x, 1 ll4W, COlnp 523/E4

4.7k, 5%. 1/4W, Co,",, 523,F5 9G/F2

22k, 5%, 1/4W, Comp 523/F5 91lF2

4.7k, 5%. IlilW, Coy 523/E',

100, 5%. l/411, Camp 5231C4 inn/C3

Transformer 522/112.3,4

741, 01' AMP, ti Pin Dip
711 ( 01' w. rob99 523/i:3 1111113

Schematic

523104 91/v

523/1:4 09/C3

523/112 I ID/ll%

PC-Board

'l5,F2

911/U

'i4,,~,1;,2,3

Iwl/Cl

Mfr. Mfr. Keithley

RRN 3386H-l-502
BRN
PRP

PRP
MEP CR25*
MEP CR25*
MEP CK25, 5%. 4.7k IX-76.4.7k
IMiP 0125, 5%. lk R-76.lk
MEP CR25. 5%. Ik
Y-I TR -1 76

n-n
5IG N5741V IC-42

I NT

3386H-lb5nl RP-lll-5n1

-.

-­.-

AD5,5K IC-241

74 I IC-77

RP-111.Sk

R-2R7-Ink
R-286.R981
R-ZRfi-89.1
IR-76-4.7k
R-76.22k

R-76-100

11654
U655
1U65G
U657
UGill
"Rh51
VR652
VRh53

*Manufacturers Oesiqnation includes Parts Description, e.9. CR25, lK, 5%, 1,'4bl, Camp, RbR7.

tl Fl ill 1101~5 211 IPin Dip 523/G4 lIZliZ
ii lFli(~ Flops. 2C I'in Dip 523/1;2
3 Nand Gdtiis, 14 IPin lliI1 !,23/f;5 114113
4 Iland IGat~s. 14 I'in lii~>
4 OK Gates. I4 Pin Ilip
k!qnl ator, ifI-22n ',23/1)3 122/1:3 F-I ,,*7son,ic IC-243

zrner IliOdC 523/112 123/1)3 MO I lN4577 DL-58
icncr Iliodi- 523/C2

523,111 ,15/i-2

523,)3 , 1611~3

,,3/1:1

124103

Mill 741~5374 IC-242
MOT 141~5374 IC-242
T-l 74LS ION IC-155
Mn~r 74Lsnn IC-163
5 I(; N7432A IC-115

MOT lN749A OZ.63

7-25

Table 7-9. Filter MUX Board PC-521 Parts List

:ircuit Schematic PC-Board
lesig. Description Location Item No./Location

:401 .1,IF, 5nv. Ci?i"F 52llD2 41112

:402
1403 .l,,F, 16V, CerD
:iln4
:4r)h
:407 .l,,F, lGV, Cerll
Z4"li

:4n9 .47,,F. 4nov, Polypro 521/113

:410 lrlnnpF, 5OOV, Polysty 521IR3 13/F:<

:411 innnpF, 'innv, P0iysty iZl/RI 14/1;3

C412

.l,IF, I6V, CerD

l,IF, IGV, cc!rn

.luF,

IGV, Ccrll

.47,,F 4nflv, ~0iypr0

.I,$. lGV, CcrU 521/(;5 15/1:3

521/G3
52l/G4
521/F5
52liO5
52llC5
521/lil

5103
h/Ii?

7lC4

9!E3

In/i3
lliF2

12/1~3

Mfr. Mfr.
Code

EKI

CLB llK16-104
ClSI
CLB IIK16-1114 C-238-.1
CLR IIKlG-lnil
CLB IJKlh-In4

EC, 4,"illII~l

ECI 41ni>11i4 C-323-.47

CLli c3rlv. 5%. c-13a-1onnpF

CLli c3ov. 5% C-138-~nnop~

Eli I RIZI-MO50 C-237-.1

Desig. Part No.
alzl-Mn5rl

65bln4M

UKlh-104

4 14K

474K

,"""mF

IOnnmmF

651.lfl4m

Keithley

C-237-.1

C-238-.1

C-23&.1

C-23R-.I
C-238-.1
C-323-.47

C413 .I,&. 1GV. Cerl) 521lG5 lb/F4

<4fll
K402
(403
K404
K4n5
R401
11402

R403

lR4O'l
R.405
R4nG

Relay
Ill?1 ay
Relay
relay
Relay

inn. ix, 1/4W, Comp

2.7k, 1%. 1/8W, Film

2.7k, l%, l/DW, Film

10, 5%, 1/4w. camp
10, 5%, 1/4w, Camp

4.?k, 5%, 1/4W, Camp

521lR2
571/R3,4
ill/R2

5211113.4
521lC2
521/C?

521/1I3

5%!/C3 301133

521163 31/113
52l/G4 32/R3
521lG2 33/03

ER 1 nlzl-Mn50 C-237-.1

COT -­COT

COT
COT
COT -­RRN CR25*

"L,!

DLE CMF l/10 R-88.6.04k

RRN
iiRN (x25* R-76-Ill
RRN CR25* R-76.4.7k

65I-104b4

KL-60

.-

.-

--

CMF l/10

ix-r-l

14-T-I

CR25* R-76-10

IRL-GO
RL-57
RI.-57
RL-59
R-76-100
R-88-2.74k

7-26

Table 7-9. Filter MUX Board PC-521 Parts List (Cont.)

Circuit
Desig.

R407

K408
K409
R41fl

R411
R412
R413
R414
R415
R416
K4ll
R418
K419
R420
H422

Description

4.a. 5%, 1/4w, co,np

13.7k. 1%. l/RW. IFi Iin

**

l%, 1/1nw. Mtf.

1 .

C~rlnet Pot

l5Ok. 1%. 1/8W, Film
G34k, I"/,, l/nil, Mtf.
Thick Film
Ccrmct P"t

OPTIONAL

G43k, 1%. 1/8N, Mtf.

IK, I%, l,iSW, Mtf.

').09k, 1%. l/IiW, Mtf.

1"k. 1%. ,/i&l. Mtf.

534k, 1%. I/BW, MtF

Schematic
Location

52l/G4

52l/C3
521/03
521/03
521/04
521/04
52llE3
521l1I3.4
521103
521/n2
521lE3
521/13
521/r2
ill/G2
521/n2

PC-Board

11

tern No./Location

32/B3

35IC2
3GlC2
3//C3
3i!/C7

?'l/C?
ilO,CZ
ill/C2
42fC2
43,.­44/n:!
45,c3

4GlC3

47,,:3
49/C4

Mfr. Keithley
Desig.

c,i25*
Ml- I,# 14, T-1 R-88.13.,k

.~

3nnbP
CMF l/IO. l%.T-1 ll-88.15nk
CMF l/In

3OOGP

CMI, h34K. l/1(1 R-88.G34k
CMF, l/IO, 1K IR-88.lk
CMF, l/10, 9.OOK R-88.9.09k
CMF, l,l".l"K
CMF-l/10-G34K R-AD-634k

Part No.
I?-76.4.7k

29996
29996
KP-8-100k

R-88.G34k

TF-84
IRP-89-100

-_

R-88-lOk

R424
11425
R426
R427
RI128
R429
R430
1~431
R432

4l9k, 1%. I/8W, Mtr

909k, 1%. l/RN, Mti
47k. 54, l/411, Camp
Thick Film

1.5k. I"/,, l/RW, MtF

3.4Rk, 1%. l/FIW, Mti
Iflk, 5%. l/4)1. Comp

Ink, 1%. l/AW, MtF

lOk, 5%. 1/4W, Camp

521lCi
521/02
52l/El
liZI/Scver;
521lFi
521lG5
521lR5
521IC2
521103

'51/D%
Liz/D3
531D3

31
I

541113
55/Ll3
56,113
57lE3
5ii/F3
59/F3

CMF-Ill0 R-RR-499k
CMF-l/l&9n9K
CRlS*

ilMi-l/IO
0,-l/10 RRE-3.4Rk
CR25*
m-1/,0
c1125*

R-88.909k
R-7647k
TF-102-1
R-88-1.5k

R-7G-IOk
R-88-10k
R-76.10k

7-27

Table 7-9. Filter MUX Board PC-521 Parts List (Cont.1

Circuit Schematic
Desig.

1433 3O.lk. 1%. l/Zld, MtF 521lliI GO/F3

1434 100k. 1%. l/Zbl, MtF 521/A3 GI/F4

1435
1436
,I437
3401 NPN, TO-92 case 521/G3
3402 NPN, TO-92 crls~ 521lG4
Q403
:j404 bl-Channel IFiT 521/F3 7l/C3 INT ITE4392 TG-77
q405
Jil"ci
:I407 N-Channel FET 521/El
:wxi II-ChannpI FtT 521/E3 751112 NAT PF5301 TG-139
740'1

Description

1Ok. 5%. 1/4W, Co,ilp 521/Rl
3fl.lk. IX. l/Zbl. MtF 52l/Bl
lOOk, 1%. 1/2w, MU 521/Al

NPN, TO-92 casr 521/F2

N-Channel FET 521/F2 72/C3 INT

N-Channel ,FFT !52 1 /II%

II-Channel Fi:I

Location Item No./Location Code Desig. Part No.

521/12

PC-Board Mfr. Mfr.

ULE

CAD
62lG3 BRN CK25* K-7G-10k
63/G3 IDLE
64lG3 CAD
Ui/Ri MOT
69/113 MOT

IO/C3 Mfll 2N3904 TG-47

73,112 NIIT Pi5301 u-139
74102

76/112 NAT PF5301

NAT PF5301 TG-139

MFF-l/ZT-13O.lK R-94-30.
MFF-l/2-l%-IOOK R-94-1001

MFFl/Z-T-l-30.1K R-94-30.
MFFllZ-T-l-10OK H-94-1001

2N3904 TG-47
2N3'106 TG-84

ITE4392 TG-77

Keithley

TG-139

74 ,I,
1411 N-Channel FiT
1412 N-Channel FLT 521/El 79/n3
Q413 NPN TO-92 cart 521/115 no/13 MOT 2N3904
Uilfll OP AMP R-pin IDIP 521/113 n5/112 NAT
u402 Voltage Rrfewnce
u403 OP AMP E-pin DIP 521/F3
11404 OP AMP urn-99 cast
u405

*Manufacturers Designation includes Parts "cscription - c.9.
**Values selected at factory to (match 11402.

N-Channel IFtT 521/F2 77103 NAT PF5301 TG-139

521lF3

521/1)3 '1G/C2 NAT LM399 IC-217

521/Fl OR/C2 n-o LF356H IC-218

OP AMP ii-pin DIP 521/02 89102 NAT LF351

7r:/03 NAT

NAT

87IC3 NAT LF351N IC-176

CK25, lflflK, I%, 1/2W, MtF, R437

PF5301 TG-139
PF5301 TG-139

LF351N IC-176

TG-47

IC-176

7-28

Table 7-9. Filter MUX Board PC-521 Parts List Kkmt.)

Circuit
Desi 9.

Schematic
Location

PC-Board

tern No./Locatiov

Mfr.

Desiq.
lLM330
LM33'1

741~8374
14LSi74
741~Slfl

Keithle
Part No

IC-219
IC-219
IC-242
IC-242

IC-155
J-3
22GA
J-3
DL-58
LIZ-58
02-59
Rr-28

RF-28

IRF-20

IR-28

RF-28

7-29

Table 7-10. Fan Assembly Parts List

Circuit
Oesig.

5302

FAN

___

___
___
___
___
_-_

*The Fan Filter nust he kept clean. Dirt in the filter will impede the air flow

through the Node1 61ci anii cause overhcatinq.

remove the filter and use col:lprcssed air to clean it.

Description
Power Connection

FAN
Fan Assenbly
Fan Suppport Bracket
Filter Support
Filter
Grommet Strip
Tape Cutting
Foam Strips

Lu!l

Schematic
Location

D5
D5

-­_.

-­__

-­__

--

--

Tt is rcconmcnded to pfriodically

PC-Board

Item No./Location

Mfr.
Code

K-I
K-I
K-I
K-l

K-I

K-I

K-I
K-l
K-I

Mfr.

Desig.

___

_..

Keithley
Part No.

CS-325-2

FN-7
3046OC
304545
30458A
FL-3*
28479A-4

30R5RA-1

TP-6-8

LU-89

7-30

Figure 7-l. Mother Board PC-516, Component Location Drawing, Dwg. No. 30411C

Figure 7-2. Display Board PC-514, Component

Location Drawing, Dwg. No. 32003
(sheet 1 of 2)

7-3317-34

-

-

--I

1

2

3

4

5

6

Figure 7-2. Display Board PC-514, Component

Location Drawing, Dwg. No. 32003

2 of 21

(sheet

7-3517-36