Keithley 236, 237 Service Manual

KE1TH

LEY

1

NSTRUMENTS

Model Model

Service

236 237

Source High

Manual

Measure

Voltage

i

Unit

Source

and

Measure

Unit

Contains

Publication Document

‚

1 T

Ij

Servicing

Date:

October

Number:

F

fl

LI

r

Lt

U

1991

236-902-01

‘

fl

u

i

ii

Information

D

Rev.

n

UI

ri

LILIU

n

for

_I

j

rn

the

o

i

Model

236/237

Keithley period

Instraments,

year

of

1

from

Inc.

date

warrants

shipment.

of

this

WAR

product

RANTY

tobefree

from

defects

in

material

and

workmanship

for

a

Keithley

Instruments,

rechargeable

During

the

fective.

To

exercise

Cieveland,

prepaid,

tion prepaid. least

This ten

Repaired

days.

90

warranty

consent, chargeable instructions.

WARRANTY

THIS

IMPLIED

ANY

REMEDIES

batteries,

warranty

warranty,

this

You

Ohio.

indicated

to

the

or

not

does

or

misuse

batteries,

WARRANTY

PROVIDED

Inc.

diskettes,

period,

will

replaced

apply of

damage

IN

15

warrants

we

write

given

be

service

products

to

product

any

from

LIEU

HEREIN

following

the

documentation.

and

our

at

your

facility.

are

option,

local

assistance

Repairs

warranted

will,

or

call

prompt

LIMITATION

defects

OF

resulting

part.

leakage,

OTHER

This

or

battery

ALL

MERCHANTABILITY

BUYER‘S

ARE

for

items

either

Keithley

OF

from

90

repair

representative,

and

return

for

be

made

the

will

WARRANTY

product

warranty

problems

or

WARRANTIES,

OR

AND

SOLE

days

from

or

replace

instructions.

and

balance

modification

also

does

arising

EXPRESSED

FTTNESS

EXCLUSIVE

the

or

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of

not

from

date

any

contact

product

the

apply

FOR

shipment:

of

product

Keithley

the

Send

retuined,

original

without

normal

warranty

Keithley‘s

to

fuses, wear

TMPLIED,

OR

PARTICULAR

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REMEDIES.

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product,

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failure

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transportation

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INCLU1JIMG

THE

USE.

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NEITHER

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OF BEEN

ADVISED

SHALL

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SUSTAINED

KEITH

Instruments

AUSTRIA: FRANCE GERMANY: GREAT

BRITAIN: ITALY: JAPAN: NETHERLANDS: SWITZERLAND: TAIWAN:

KEITHLEY

INDIRECT,

ITS

OF

IN

INCLTJ1JE,

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Division,

Keithley Keithley Keithley Keithley Keithley Keithley

Keithley Keithley

Keithley

INSTRUMENTS,

SPECIAL,

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BUT

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Instruments Instruments Instruments Instruments, Instruments Instruments Instruments Instruments Instruments

Instruments,

GesmbH SARL•3 GmbH

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Keithley

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AND

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THE

LIMITED

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INJURY

OF

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Garays

des

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West

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ITS

OF

CONSEQUENTIAL

OR

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SUCH

OF

COSTS

TO:

PERSON,

ANY

•

Cieveland,

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0222-804-6548

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EMPLOYEES

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DAMAGES.

REMOVAL

OF

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OR

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SHALL

BE

DAMAGES

INSTRUMENTS,

SUCH

EXCLUDED

INSTALLATION,

AND

TO

81-45-201-2246

•

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01830-30821

FOR

01ff

HAS

886-2-509-4473

Service

Manual

Model

237

High

236

Voltage

Source

Measure

Source

Unit

Measure

Unit

.

%

Rlght$

Instruments,

Reserved

Ohio,

01990,

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Keitbley

AU

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DocumentNnbec236-902-O1

U. S.

Inc.

A.

All

Keithley

Other

brand

products

and

product

are

trademarks

names

are

trademarks

or

registered

trademarks

or

registered

of

Keithley

trademarks

Instruments,

their

respective

of

Inc.

holders.

BESCHEINIGUNG

DES

HERSTELLERS/IMPORTEURS

etwirdbescheinigt,(da3)/dasMODEL mit dieses

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den

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angezeigt

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und

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die

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IS

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Incorporated

CERTIFICATE

1046/1984

Berechtigung

funkentstort

BesUnimungen

ist

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AUF

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BEI

ANDEREN

DER

FUNKENTSTOERBEST1UNGEN

WWD,

23

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ANLAGE,

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Measure Unit

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PRECAUTIONS

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Bei ten. sind tional gefahr oder nahme vor

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Berühren schlüsse, Geräten, Stellen Kabel Testanschlußdeckel Strom Deckelschlosses,

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jeder

eine

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keinen

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gedacht, das

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wenn

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maximalen

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prüfende

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zu

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sichere

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immer

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mit

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237

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alcun

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lato

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superare

pannello

posteriore

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d

strumenti

misura

di

al

procedere

connettori

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di

lailmentazione

del privadipericoli.

dcl

conlemani

i

livelli

gli

e

DI

SICUREZZA

le

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sorgente

di

sorgente

precauzioni

quallficatoingrado

corrente

danni

alla

prima

con

Potrebbero

delle

persona.

d‘utilizzare

estrema esservi

dell‘Apparecchio

americano

vi

buona

prima

necessario

sicurezza,

sono

abitudine

non

dei

liveffi

di

misurare

verificare

accusino

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circuito di

ponti.

cavi

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di

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sicurezza

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quando

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misura

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di

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vokaggio

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attendersi

circuito

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connessione,

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di usura,

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connettori

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massa.

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jiV

iV

1

mV

resolution

single

range

range.

100

source.

0,1—10Hz

<

V

lOmA

CYCLE

(LINE

RESOLUTION

4-Digit

100fA10fA±(0.3

100pA10pA±(0.04

100

3ppm

<

3ppmofrange

<loppm

8mV

(110V

p-p

range).

step,

typical.

lOmA

integration

CYCLE

>10142

paralleled

MEASURE

5-Digit

1pA100

10

1nA100pA±(0035%+700

10

fA

pA1pA

nA1nA

nA10nA

1iA100

10

nA

iA

1

jiA

V

ACCURAC

Year,

(1

18°-28°C)

[1o/IFSI

300jiV

+

X

45OtV)

lOmV)

lmV)

±(O.028%

+

±(O.025%÷ ±(O.025%+

±(O035%+lOOmV)

add

lOOppm

value.

in

Model

237).

of

range

of

range

range).

time

selected).

integration

ACCURACY‘

±(0.3 ±(021

±(0.035%+

±(0.038%+600

±(0.1

time

<2OpF.

by

1

Year,

(1

18°—28°C)

%+100

%+

1

%+

6

%+

60

6

60

6

%+

fA)

2 pA) pA) pA) pA) nA)

nA)

iA)

1

Spedfications

200ppm

arc

2

Offset

specification

coefficient

COMPLIANCE:

5OfA/°C.

Maximum:

Minimum:

Accuracy,

NOISE

(p-p

ranges).

OVERSHOOT: SETTLING

OUTPUT

R,

VOLTAGE

applyfor

5-digit

of

range.

applies

Bipolar

±1100V

(except

±0.1%ofselected

Step

Size: Same

of

range):

0.1—10Hz:

<0.01%

typical

TIME:

<500jisec.

>10142

C:

BURDEN

paralleled by

(as

resolution.

for

23°C±1°C

voltage

±110V

as

an

ammeter):

current

voltage

(lOmA

to

For4-digit

limit

on

<3ppm

0.01% <2OpF

resolution,

with suppression.

with

lOOmA

range.

single

rangeinModel

set

source.

(<20ppm

RL

(on

=

step,

inA

lOk2).

step,

(lOmA

<lmV.

on

R

range).

all

offset

Temperature

value.

inA

and

=

lOk2).

terms

237).

lOnA

SPE,

DC1,

front

BUS

IMPLEMENTATION

COMMANDS:

SPD.

COMMANDS:

FUNCTIONS:

DT1,

CO,

panel

functions

and

Terminator.

addressisset

SPEED SOURCE-DELAY-MEASURE TO

IEEE-488

RATE:

MEASUREMENT

110

bus):

LATENCY

IEEE-488 MULTILINE

UNL, UNILINE INTERFACE

PPo, All

bus,inadditiontoStatus,

Trigger, 1EEE488

EXECUTION MINIMUM

RESPONSE MEASUREMENT CONTINUOUS

IEEE.488 TRIGGER

IFC,

El.

and

from

COMMAND

lmsec.

readings

TIME:

DCL,

REN,

SHI,

setups

Service

front

per

<2msec.

LLO, SDC,

EOI,

AHI,

are

Request,

panel

per

point

SPEED

second.

SRQ

T6,

TEO,

available

menu.

CYCLE

a

(as

source): into (source

GET,

ATN.

L4,

over

Output

internal

GTL,

LEO,

the

Format,

TIME:

25msec.

DC

UNT,

SRI, RLI,

IEE&488

lmsec.

buffer.

value

EOI,

over

GENERAL LOAD

CAPACITANCE:

REMOTE

Maximum resistance

GUARD:

ISOLATION

with MAXIMUM CONNECTORS:

TEMPERATURE COEFFICIENT

ENVIRONMENT:

Operating:

Storage: WARM-UP: COOLING: POWER:

110V DIMENSIONS,

(3.5 ACCESSORIES

Model Model

ACCESSORIES

Model

SENSE:

lk2

a

(as

Output

Maximum

Offset

(Output

500pF.

COMMON

x

±(0.l

derate

0°—50°C,

RH/°C,

3%

—25°

to

One

Internal

105—125or210—250V

and

180—220V

in.x17.125

WEIGHT:

SUPPLIED:

7078-TRX-3:

236-ILC-3:

AVAILABLE: 8000-10: 8000-14:

Stable

Corrects

per

sense

source)

Output

LO

MODE

70% 35°—50°C.

fan

forced

version

x

17.625

Triax Interlock

Equipment Equipment

lead

to

Input/Output:

89mm

voltage

Resistance:

Relative

Outputs: Trigger

Interlock:

applicable

65°C.

hourtorated

in.

forupto

Output

3-lug

3-pin

accuracy

relative

in.).

to

into

rated

for

is

O.52.

l2k2.

Current:

chassis):

VOLTAGE:

triax.

miniature

(O°-18°C

accuracy.

cooling.

air AC

(external

available.

high

Net

Triax

Cable

Rack Rack

20,000pF

2V

HI: ±2mV

specification)/°C.

humidity

Cable,

typical.

drop

in

accuracy.

±2mA.

max.

Typically

200V.

BNC.

DIN.

&

28°-50°C):

up

switch

100VA

max.

x435mmwide

weight

9kg

0.9m

for3SMUs for

4

SMUs

each

Residual

>10b02

to

35°C.

selectable),

x448mm

(19.75

(3

ft.)

(10 (14

output

in

lbs.).

in.) in.)

lead.

output

parallel

Linearly

90—

deep

Table

Contents

of

SECTION

1.1

1.2

1.3

1.4

1.5

1.5.1

1.5.2

1.5.3

1.5.4

1.5.5

1.5.6

1.5.7

1.5.8

1.5.9 lOOmA

SECTION

2.1

2.2

2.3

2.4

2.5

2.6

2.6.1

2.6.2

2.6.3

2.6.4

2.7

2.8

1

INTRODUCTION ENVIRONMENTAL INITIAL REQUIRED VERIFICATIONS

Equipment Common Voltage Voltage Remote Low

Current

Low

Current

lOOmA

2

=

INTRODUCTION RECOMMENDED ENVIRONMENTAL WARM-UP

LOCK

CAL CALIBRATION

Equipment Voltage lOOmA

Low CALIBRATION CALIBRATION

Performance

COND1TIONS

EQUTPMENT

TEST

PROCEDURES

Characterization

Mode Source Measure Sense

Measure Source

Verification

Verification (inA (inAtolOmA)

Range

Calibration

PERIOD

PROCEDURES

Characterization

Calibration

Range

Current

Calibration

Ranges

ERRORS PROGRAM

Verification

CONDITIONS

Verification

lOmA)

to

Verification

Range

Verification

CALIBRATION

CONDITIONS

Calibration

Measure Source

EQUIPMENT

(inA

Ranges

—

lOmA)

Verification

1-1 14 14 1-1 1-1 1-3 1-6 1-8 1-9 141 1-12 1-15 1-18 1-20

2-1 2-1 2-2 2-2 2-2 2-2 2-3 2-6 2-9 2-11 2-13

246

SECTION

3.1

3.2 3,3

3.4

3.5

3.6

3.7

3.8

3.8.1

INTRODUCTION

LINE FAN BATrERY HANDLING AND DISASSEMBLY SPECIAL TROUBLESHOOTJNG

Maintenance

3

—

REPLACEMENT

FUSE

FILTER

Recommended

CLEANING

REPLACEMENT

HANDLING

CLEANING

INSTRUCTIONS

OF

Test

Equipment

PRECAUTIONS

STATIC

SENSITIVE

DEVICES

3-1 3-1 3-1 3-2 3-4 3-4 3-11 3-11 3-11

382

38.3

3.8Ä

3.8.5

3.86

Diagnostics Power Analog Control Analog Digital

Supply

Switching

and

Display

Checks

Lines

Checks

341 343 344 344 3-16

SECTION

4.1

4.2

4.2.1

4.2.2

42.3

4.2.4

4.3

4.4

44.1

4.42

44.3

4.4A

4.5

INTRODUCTION ANALOG

A/D DIGITAL

POWER

SECTION

51

5.2 5,3 5,4 5,5

INTRODUCTION PARTS ORDERING FATORY SCHEMATIC

4

=

Principles

CIRCUITRY

V/I

Control

Output

Feedback

V/I Resonant

CONVERTER

I/O

Controller Source/Measure Communications Display

5

LISTS

and

Stage

Converter

CIRCUTTRY

Circuitry

SUPPLY

Replaceable

INFORMATION

SERVICE

DIAGRAMS

of

Operation

Readback

(Model

Controller

Parts

237)

AND

COMPONENT

LOCATION

DRAWINGS

4-1 4-2 4-2 4-4 4-6 4-8 4-8 4-9 4-9 4-10 4-10 4-10 4-11

5-1 5-1 5-1 5-1 5-1

List

of

Illustrations

SECTION

Figure Figure Figure Figure Figure Figure

Figure Figure Figure

14 1-2 1-3 1-4 1-5 1-6 1-7 1-8 1-9

SECTION

Figure Figure Figure Figure Figure Figure Figure

2-1 2-2 2-3 2-4 2-5 2-6 2-7

1

Performance

Setup Setup Setup Setup Setup Setup Setup Setup Setup

2

Calibration

Calibration Setup Setup Setup Current Ui U7

Verification

for

Equipment Characterization

for

Common

for

Voltage

for

Voltage

for

Remote

for

Low

for

Low

for

lOOmA

for

lOOmA

Switch

for

Equipment Characterization for Volts for

lOOmA

Ranges

Error

Status

Calibration

Mode Source Measure Sense

Current Current

Measure Source

(Cal

Calibration

Range

Calibration

Word

Status

Verification

Ranges

Verification Measure Source

Range Verification

Lock)

Calibration

Word

Verification

Ranges Verification

Ranges

Range

Verification

(lnAtolOmA)

Verification

(lnA

to

lOmA)

1-4 1-7 1-9 1-10 1-12 1-13 1-16 1-19 1-21

2-2 2-4 2-7 2-10 2-12 2-15 2-16

SECTION

Figure Figure Figure Figure Figure Figure

3-1 3-2 3-3 3-4 3-5 3-6

SECTION

Figure Figure Figure Figure Figure Figure Figure

4-1 4-2 4-3 4-4 4-5 4-6 4-7

3—Maintenance

Line Digital Resonant

Output Analog Model

4

=

Overall

Simplified

Model

Simplified

Damping

Simplified

Voltage

Principles

Switch

Board

Converter Board Board

(Shields

237

Exploded

Block

Diagram

Schematic

236

Output

237

Output Schematic

Relay

SchematicofResonant

and

Line

Fuse

Board

(Model

Removed)

View

of

Operation

of

V/I

Stage (Simplified Schematic

(Simplified Schematic

Stage

of

V/I

Contact

Bounce

237)

Control

Feedback

Converter

and

Readback

Diagram) Diagram)

3-1 3-3 3-5 3-6 3-7 3-9

4-1 4-3 4-5 4-5 4-6 4-7 4-9

List

Tables

of

SECTION

Table

1-1

Table

12

Table

1-3

Table

1-4

Table

1-5

Table

1-6

Table

1-7

Table

1-8

Table

1-9

SECTION

Table

2-1

Table

2-2

Table

2-3

Table

2-4

SECTION

Table

3-1

Table

3-2

Table

3-3

Table

3-4

Table

3-5

Table

3-6

Table

3-7

Table

3-8

Table

3-9

Table

3-10

1

Performance

Required Specifications Model Voltage Voltage Allowable Low Allowable Low

2

Calibration

Required Specifications Model

Calibration

Maintenance

3

=

Line Recommended Power

Analog

Analog Analog Analog Analog Digital Display

Verification

Equipment

Test

For

Alternate

I-Source

263

Source Verification Measure

Current

Test

263

Fuse

Selection

Supply

Switching; Switching; Switching;

Switching; Sensing Switching;

Circuitry

Verification

Reading

Measure

Reading

Source

Equipment

For

Alternate

I-Source

Error

Messages

Troubleshooting

Checks

Equipment

Characteristics

Caiculations

Verification

Caiculations

Verification

Equipment

Characterization

Current Volts Feedback

A/D

Ranging

Multiplexing

for

Low

(inA

for

Low

(inA

to

Equipment

Current

to

lOmA) Current lOmA)

Measure

Source Verification

Verification

(lmA

to

lOmA)

12 1-3 1-5 1-8 1-11 1-13 1-14

....

1-15 1-17

2-1 2-2 2-5 2-14

3-1 3-11 3-13 3-14 3-15 3-15 3-15 3-16 3-17

3-18

4

SECTION

Table

4-1

=

Principles

Volts

Range

of

Relays

Operation

4-8

SECTION

Performance

1

. .

Verification

1

INTRODUCTION

The

procedures

verify

that

the

stated Performance strument misadjustment tion instrument

Before

sure the

tor‘s

1

All

and

1

in the

is

may

also

accuracy,

If

the

instrument

than

1 performance contact factorytodetermine tion.

attempting

you

are

Model

236/237.

Manual

.2

ENVIRONMENTAL

measurements

less

than

at

INITIAL

3

The

Source

3wire

outlined

instrument

specifications

verification

first received

has

occurred

be

performed

orfollowing

year

from the

falls

your

Keithley

anyofthe following

familiar

for

with

Refertothe

complete

shouldbemadeat18-28°C

70%

humidity.

CONDITIONS

WARNING

Measure

power

cord

in

this

section

is

operating within

at

the front

maybeperformed

ensure

to

whenever

NOTE

is stffl

date

outside

the

during

under

representative

calibration,

shipment),

of

the

specified

correct

that

shipment.

thereisquestion

warranty

course

procedures,

the

controls

and

Model 236/237

information.

CONDITIONS

Unitisequippedwith

that

contains

maybeused

the

of

this

no

when

damage

Verifica

if

desired.

(less

and

manual.

the

its

range,

the

or

of

ac

operation

Opera

(6582°F)

a

separate

a

limits

in

make

to

or

of

grotmdwire and

grounded

are

made,

power

outlet electric

Model

The

up

warm

procedures.Ifthe

cation extremesoftemperature paragraph

temperatures

ternal ture.

Typically, unit range.

1.4

Table

verification used tions equipment quired

Table

The are

do measurement

is 10°C

that

RECOMMENDED

1-1

longasthe substitute

as

least

at

ifusing

1-2.

accuracy

based

include

not

caiculate

specifications

then

tions,

outlets,

instrument

ground.

line may

result

shock,

236/237

foratleast

additional

1.2),

it takes

(18°F)

summarizes

procedures.

as

good

characterization

equipment

limits

on

test

falls

limits

and

repeat

Model236/237

the

only

new

must

one

to

as

stated

equipment

slightly

based

test

is

designedtobe

When

proper

chassis

Failuretouseagrounded

in injury

turned

be

hour

before

instrument

(outside

tinte

should

reach

normal

one

additional

outside

the

TEST

recommended

Alternate

connections

is

connected

or

death

on

beginning

has

the

range

be

operating

hourtostabilize

specified

EQUIPMENT

equipment

in

those

that

listed

(paragraph

the

in

Table

the

meets

verification

specifications,

tolerance.

outside

both

equipment

the

on

instrument

accuracy

test.

used

with

to

due

to

and

aliowed

verifi

the

been

subject

specified in

allowed

for

tempera

temperature

for

may

has

specifica Note

1-2.

1.5.1)

is

not

specifications

procedures

and

particular

If

a

allowed

range,

accuracy

specifica

to

in-

a

the

be

that

re

in

they

14

SECTION

Performance

1

Verification

Manufacturer Keithley

Keithley

Keitffley

Keithley

Fluke

Model 263

193A

617

8006

2364LC3

343A

Table

14.

Description 54

/2

Source

54

/2

44

/2

Electrometer

Test

Fixture Interlock

Dc

Voltage

digit

Required

Calibrator/

DMM

Cable

Calibrator

Test

Equipment

Specifications

2nA, 200nA

200mV, 20V4000V 2OO22OOk2

2pA

range; 2OpA 200pA 2nA

range; 2OnA 200nA 2iA

range; 2OjiA

1OV4000V

2OnA

range;

2V

range;

ranges;

±(O.0625%

±(O.035%

ranges;

±(1.6%

ranges;

±(1.6%

±(O.005%

±(O.007%

±(ft007%.

+

±(L6%

±(O.25%+5

±(ft25%

±(025%

±(O.15%

+

±(O.15%

ranges;

±0.002%

66

7

+

4

+

10

+

counts) counts)

1

count)

counts)

1

count)

1

count)

counts)

1

count)

10

+

counts)

2

+

counts)

+

1

count)

2

+

counts)

Valhalla

Keithley

Pomona

t5

The dures the Table dures

VERIFICATIONS

following

forverifying

Model

14. include

equipment.

These

procedures

personnel

236/237

The

using

paragraphs

the

one

using allowable error

that

are

intended

accurate

2500E

R-185-10 R-249400 R2634k R-263400K

7078-TRX

6172

B-24

PROCEDURES

contain the

year

accuracy

the

equipment

reading

could

and

limitsinthese

contributed

be

use

for

reliable

Current

102

Resistor

1002

Resistor

lk2

Resistor

lOOk2

3s1ot

(3

2-slot

Resistor

Triax

required)

male

male triax

required)

(2

Banana

required)

(6

detailed

specifications

only

by

test

equipment.

Calibrator

cable

to

adapter

plug

proce

listed

proce

this

by

qualified

34ug

cable

of

in

If

300mA

±0.1%, ±0.1%, ±0.1%, ±0.1%,

range;

±0.025%

±l0ppm/°C ±20ppm/°C ±l0ppm/°C ±l0ppm/°C

fe

the

instrumentisoutofspecifications

ranty,

refertothe

calibration

WARNING

Lethal

237) fixture, the nected

voltages

(up

willbeconnectedtothe Model

To

avoid

to

interlock

the

Model

safety

sectionofthis

1000V

to

possible

a

circuit

236/237.

and

for the

shock

must

not

manual.

Model

8006

hazard,

be

under

test

con

war

12

Connect earth mum connecting

Also, enabled. HIisalso nals

Table

Instrument DMM

Source

Measure

1

.5.1

the

ground

before

keepinmmd

Thus,

present

of

the

1-2.

Type

dc

Current

dc

Equipment

test

fixture

using

Turn

use.

or

discomtecting

that

a

lethal

on

the

Model

236/237.

Specifications

Equipment

Required Same

(see O.9nA,

Keithley O.9iiA;

9iA, ±l7Oppm

25Oppm

Characterization

#18

off

voltage

Table

9OpA,

screw

AWG

power

all

wires

GUARD

two

For

Specifications

Keithley

as

1-1)

9OnA,

9nA,

263

±l8Oppm

900pA,

rdg

to

wire

or

is

on

OUTPUT

Alternate

193A

Table

(see

±500nA

safety

mmi

before

cables.

always

termi

Same

9mA;

as

14)

Model

Zero

3. At

A.

disconnect nected Connect

B.

nal Sense On

c.

lead

D.

Relocate nal at shown

4.Inthe

actual

the play

the

Set

5. 200mV

cancel

To

6.

its

ing

7.

Remove and +O.9OOOOiA

the

In

8. drop

Model

193A

the

Model

the

of

the

resistance.

of

the

space

the

of

Riooico

Model

range,

input

the

place

space across

193A.

Ohms

193A

SENSE

the

BINDING

to

jamper

that

the

input

of

Model

jumper

the

test

Component

in

Figure

provided

of

value

Model

=

193A and offset,

any

(VOLTS

short

Model

the

to

below,

the

functiononthe

follows:

as

1

terminal

(HI)

jumper

POST

to

socket,

test

Model

the

enable

193A,

back

socket.

Make

Test

1-1.

below,

lOOk2

the

193A.

the

to

disable

zero HI

to

the

from

263

100kL2

resistor

useapencil

resistor

Performance

whose

on

2

SENSE

the

This

193A

ZERO

the

to

sure

Module

use

resistor

DCV

ZERO.

Model

the

and

LO)

of

input

in

operate

to

the

from

200k2

the

of

other

the

2

shorts

the

at

SENSE the

are

pencil

a

from

ki2

ftmction

193A

enabling

the

record

display

SECTION

Verification

range.

socket

test

endiscon

Panel.

Signal

termi

(LO)

the

Ohms

socket.

test

to

cancel

termi

1

connections

correct

record

to

the

and

short

by

ZERO.

Model

to

source

voltage

the

of

1

test

as

dis

the

193A

the

order

In and 9jaA,

characterized. 1O2 for

characterization:

1.

2.

verify

to

measure

O.9mA

9OjaA,

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and

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Table

the

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imA

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14)

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the

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ment

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1-3

SECTION

Performance

Waming: to

Safety

Ground

1

Verification

Banana

Model

Plug

263

Cables

Source

(5)

Ground Link Installed

Figure

14

A.

B.

.

Connections

Schematic

Setup

Model

8006

263

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(Source

Equivaent

Equipment Characterization

for

1)

Test

OUTPUT

COMMON

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n

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14

Performance

SECTION

Verification

1

10.

11

12.

13.

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the

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the

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performed

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Model

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the

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3

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of urement

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15

SECTION Performance

1. Verification

27.

28.

29.

30.

31.

32.

33,

34,

35,

I09mA

record

Table

Place In

the

1002

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the

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the

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verify

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LINECYCLE

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Figure

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the

PERIOD,

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verification,

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52

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lt

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14

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nterlock

Cable

Performance

SECTION

Verification

1

Waming:

Safety

to

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F—

A.

z

8006

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Test

p

z

Fixture

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for

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1-2.

Figure

Setup

Equivalent

Mode

Verification

1-7

SECTION

Performance

1

53

Setup

the

following

The voltages cause tion levels.

1.

Set

the Model

range.

2.

While

the

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fixture

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in

Figure

the

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measure

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compliance

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panel

to

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4,

5.

6.

7,

8.

9,

10.

11.

12.

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fixture.

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verify

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output

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-10V

+100V —100V

+1000V —1000V

compliance

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Table

236/237

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1.1V 11V

110V

1100V

1.1V

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to

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14.

Voltage

Source

Verification

Allowable

193A

Range

200mV 200mV -2.400mV 200mV

—24,000mV

2V

+0.99902V

2V

20V 20V

200V 200V

1000V 1000V

Reading

(18°C

-0.650mV

-0.240V

-0.99902V

+99943V

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to to to to

to to

to

28°C)

on

Model

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+24000mV

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+100057V

—100057V

+100.057V

—100.057V

+1000,64V

—1000.64V

193A

1-8

Waming: to

Safety

Ground

SECTION

Performance

1

Verification

1

Figure

1

54

Set

the

L

1-3.

the

up following

The voltages cause

when

tion

levels.

While

measure current

Cönnections

A.

Schematic

B.

Setup

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equipment

steps

following

(1000V

injury

encountering

in

standby,

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source

for

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shown

verify

to

WARNING

procedure

for

or

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setting

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range.

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8006

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in

voltage

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V)

OUTPUT

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Verification

Figure

14

measurement:

hazardous

uses

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lethal

the Model

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Verification

perform

and

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voltage

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the

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2.

3,

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ta

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6.

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Table

of

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the 1-5.

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the

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the

on

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1-9

SECTION

Performance

1

Verification

voltage

allowable

9,

Repeat

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8

using

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Connections

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237

out

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Figure

140

1-4.

B.

Schematic

Setupfor

Equivalent

VoltageMeasure

Ranges

Verification

Perfonnance

SECTION

Verification

1

343A

*236/237

Range

1OV 1OV 1OV 10V

10V 10V

100V 100V

1000V 1000V

settosource

343A

OnA

Table

Output

OV 0V OV 0V

+1V —1V

+10V 40V

+100V —100V

+1000V —1000V

inA

on

source

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range.

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236/237

Compliance

Measure

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1.1V 11V

110V

1100V

1.1V

11V 11V

110V 110V

1100V 1100V

Measure

Limit

Range*

Verification

Allowable

ftOOO3OV OO.OO1OV OOOO1OV

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0.99942V

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—9.9965V

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(18°C

to

28°C)

to to to to

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Reading

+ft0003OV +OftOOlOV +000.010V +0000.10V

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.00058V

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1

55

up

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When mote

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power

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a

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in the

verify

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in

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connecting

Verification

Figure

in

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voltage

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regardiess

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verify

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that

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of

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the

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of

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the

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on the

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at

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the

banana

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connect

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enable

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to

operate

within

10.00500V. standby

141

SECYION

Performance

1

Verif-ication

Waming:

Safety

to Ground

Connect

Earth

‚

1_

‚=‘

0

—

Connections

A.

:

0,

z

.

‘@@‘,

(Source

::

‚

8006

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A

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V)

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Fixture

OUTPUT

SENSE

LO/OUTPUT

LO

Cable

(236-lLC3)

7O78TRX

Cables

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1

193ADMM

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UOBIOiLQDU:QNBOU

(3)

Banane

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00

ntertock

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B.

Schematic

Figure

t56

Setup

the

1-5.

Low Measure

the

equipmentasshown

following

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Setup

Current

for

Ranges

verify

to

Remote

ranges:

L

Use

the

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and

Table

ljiA

through

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recorded

1-6

IO9mA

to

caiculate

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in

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Table

readings, transfer themtoTable

Whileinstandby,

2.

measure source

142

currentby

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configure the

settingittosource

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(inA

Verification

Figure

in

the

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allowable

the

ranges.

were

13.

After

Verification

lOmA)

to

16

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to

values

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17.

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perform

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calculated

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for

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the

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enable

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Verify

entry

the

lOnA

reading

ranges

standby,

GUARD.

compliance

inA

measurement

that

is

within

236

of

Table

Model

the

on

specified

Table

17,

with

236/237,

lOnA

this

in

check

While

3,

and

4,

Setthe on ATE.

Model

first On

5,

to

the lirnits Using

to

6. rent

Mode1263

set

limit

ofthe

range

current

the

allowable

the

17. change

measurement

the

table.

the

rest

the

output

Mode1236/237

measurement

of

the

to

and

enable

limits

the

compliance

range.

rangeiswithin

Model

the

Model

the

listed

Verify

range

to

OPER

on

in

limit

236

263

lnA

the

that

the

cur

in

standby.

Performance

SECTION

Verification

1

7.

Set range, to Verify

8.

in

On

9,

Figure

the

inA

the

1-6.

Model

and

set

on

the

that

table.

Mode1263,

Note

Setup

263tooutput

the Model

lnA

measuiement

236/237

readingiswithin

change

the

LZJ

Source

263

(Source

:

263

GUARD

Low

Current

for

+O.90000nA

compliance

range.

the

limits

output

to

1)

enabled

Measure

on

the

specified

negative

Ranges

2nA

limit

po

Verification

10.

11.

larity specified Using lOmA Place

(inA

and

verify

in the Table measurement

Model

the

to

lOrnA)

the

reading

that

table.

1-7

guide,

as

a

in

263

10000Boo

ranges

standby.

check

of

the

6ö:

LiQo

within

is

the

Model

lOnA

the

limits

through

236/237.

Table

236/237

Measure

Range

1iA

lOjiA

lOOjiA

1mJ

lOmA

*

IO9pA,

**

Allowable

***

fle

Model 263

1=6.

Reading

+IO9M

Allowable

Calculations*

±

(0.0004)

[

Reading

IO.9A

—Io.9±[(O.OOO4)Io9+6OpAJ=

+I9±[(O.OOO35)I9+7OOpA1=

±

—I9A

+I9OpA

49OA

(0.00035)

[

±

(0.00035)

[

±

(0.00035)

[

+IO9mA±[(O.00035)IO.9mA+6OflAj

I9iA

I

9o

I9O

—Io.mt±[(O.OOO35)Iosmi+6OnA1

+I9mA

±

(0.00038)

[

Im

—I±[(O.OOO38)I+6OOnA]=

I9A,

I9OiA,

reading

calculated

263

and/or

and

Model

and

IO9mA

limits

allowable

A

193A.

193A

calculated

is

are

I9flA

aretobe readings

out

obtained

transferred should

allowable

specification.

of

+

700pA

+

6OpA

6flA

6nA

600flA

Caiculations

1

=

1

=

1

=

1

Table

from

Table

to

the

within

be

reading

1-3.

1-7.

listed

that

for

Lower

.

+

—.

+.__jiA

—

.

+

—

+.

.

+

.

—.mA

typicallimits.

does

Low

Allowable

Limit

.

—

not

fall

Current

i.LA

iiA

LA

jiA

iiiA

flLA

iiiA

within

Readmg**

Upper

+

—_.

+._A

—

+

—

+.

+

—.mA

These

these

Measure

.

•

.

limits

Limit

.

are

indicates

.

—

based

jiA

iA

ilA

iA

fltA

Verification

Typical Limits***

jiA

+O.90000iiA

—O.90000jiA±87OpA

+9.0000j.tA±8nA

—9.0000pA

+9O.OOOLA

—9O.OOOiA

+O.900001TLA±800flA

IflA

iflA

0.90000fllA±800flA

+9.0000mA —9.OOOOmA±9.4iA

the

90-day

on

caiculation

a

error, or

to

(1iA

±87OpA

±8nA

±83nA

±9.4iA

specifications

that

lOmA)

of

the

Model

143

SECTION

Performance

1. Verification

263

Range

2nA 2riA 2nA 2nA 2nA 2nA 2nA 2nA

2nA 2nA

2OnA 2OnA

200nA 200nA

2iiA

2jiA

Table

263

17.

Output

Standby Standby Standby Standby Standby Standby Standby Standby

+O.90000nA

—O.90000nA

+9OOOOnA

—9.0000nA

+9OOOOnA

9O.OOOnA

+ft9OOOOiA

-O.9OOOOiA

Low

Current

236/237

Compliance

Measure

&

inA

lOnA

lOOnA

ljiA

lOiiA

OOjiA

imA

lOmA

inA inA

lOnA lOnA

lOOnA lOOnA

1iA liiA

Measure

Limit

Range*

Verification

Allowable

to

(18°C

28°C)

—O.OOO1OnA OOOO1OnA OOO.OO6nA O.OOOO6jiA OO.OOO7jiA —OOO.OO6tA

-OOOOO6mA OOOOO6mA

O.8972OnA

+O.8972OnA

—&972OnA

+&972OnA

-898O5nA +89.8O5nA

-

+

to

(inA

Readings**

to

+O.000lOnA +OO.00lOnA

to

+000.006nA

to

+OOOOO6jiA

to

+OOOOO7jiA

to to

+OOO.OO6iA

to

+OOOOO6mA +Oft0006mA

to

+O.9O28OnA

to

—O9O28OnA

to

9.O28OnA

to

+9O28OnA

to

—90.195nA

to

+90.195nA

to

to to

+___________

lOmA)

2OiA 2OjiA

200jiA 200jaA

2mA 2mA

2OmA 2OmA

*236/237

**Allowable

set

+9.0000jiA

9.OOOOjiA

+9OOOOjiA

9O.OOOiA

+O9OOOOmA

-ft90000mA

+9.0000mA —9.0000mA

for

0V

on the

the

source

to

readings

lj.tA

1,1V

thru

lOjiA lOjiA

lOOjiA lOOjiA

imA imA

OmA lOmA

source

lOmA

range.

ranges

—

+

-

+

—

+

are calculated

in

Table

1-6.

to to

+___________

to to

+____________

to

—____________

to

+___________

to

—____________

to

+____________

144

Performance

SECTION

Verification

1

.5.7

the

Set

up

following steps

the ranges:

1.

Use

Table

the

ljiA

I9OpA,

I9tA,

recorded

and lowable While in

2. source ance While

3.

on

OnA

4.

With 617

on

5.

On

the

Model

ingonthe

the

first

Set

the

6. Model

the

that specified

7.

Using source

Current

Low

Source

equipment

1-8

to

through

and

IO9mA

in

readings,

standby,

OnAonthe

limitof1.1V

standby,

in

2nA

the

ZERO

CHECK

2pA

236/237

Model

to

in

the

1-9

on

range.

617,

of

617

source

the

Model

entry

Model

236

reading

Table

zero

Ranges

as

shown

to

verify the

caiculate

OmA

IA

Table

transfer

configure

lnA

on

the

configure

range.

enabled,

disable

in

is

617

Table

to

OnA

the

on

second

guide,

a

as

lOOnA

(1

nA

Verification

in Figure

the allowable

ranges.

were

After

1-3.

them

the

source

1.1V the Model

zero

ZERO

operate.

within

1-9.

2OpA

the

on

Model

of

entry

set

through

1

OmA)

to

17

and

to

lOmA

inA

readings

The

values

previously

caiculating

Table

the

Model

with

range

measurement

263

correct

CHECK

Verify

that

the limits

range,

range.

lOnA

is

within

617

1-9.

Table

Model

the

lOmA

perform

source

for

calculated

the

1-9.

236/237

compli

a

range.

source

to

Model

the

and

the

specified

and

set

Verify

limits

the

236/237

ranges

for

IO9A,

a1

place read

the

and

select

to

source

operate,

Verify

thelimits

Models

the

that

limits

the

proce through through

Model

the

it

po

to

and

the

are

within

and

program

and

263

in

263

617,

within

the

and

reverse

Mode1236/237

operate,

in

Verify

within

basic

the

lOnA

the

ljiA

the

for

the Models

and

in

inA

set

236/237

Model

zero

in

and

263

the

617

guide,

14

Note

Table zero

in

readings

zero

standby

in

source

the

on

236/237,

set

to

and

Model

is

repeat

check

to

that

values

check

range.

Model

and

Model

the

617

is

check,

the

—O.9nA.

263

617.

still

for

1-3.

check,

the

Model

in

the

ZERO

in

Model

Models

sources.

Models

on

in

are

Model

subsequent

236/237

on

standby,

2nA

Models

on

table.

the

617 in

Model

the

check

Model

the the

table.

as

1-9

through

8

ranges.

the

taken

617 in

617

the

range.

CHECK

the

standby.

263

Thatis,

236/237

on

a

source

from

standby.

that

check

limits.

listed

the

Place

8. 2OpA

range. Place source While +O.9nA Place and

disable

that

the

—O.9nA

stffl

on the

both

reading

9,

10.

11.

specified

to

12.

13.

14.

Place

and

263 On

both larity +O.9nA Place disable

the

236/237 the

ofthe

and

the

zero

reading

in

15,

specified

Using

in

dure 1OmA lOmA

Table

steps

source

ranges,

236/237

the

Place

to

16. 263

and

236/237

Table

1-8,

Source

*

** ***

Allowable

236/237

Range

1iA

lOj.tA

1OO.tA

lmA

lOmA

I9tA,

IO9A,

Allowable

calculated

The

fications

caiculation

I9OiA,

reading

of

the

error,

Reading

±

(0.0005)

[

±

(0.00050)

[

(0.00050)

±

[

±

(0.00050)

[

±

(0.0005)

[

and

IO9mA

limits

allowable

Model

that

or

Reading

Calculations*

I9A

are

to

readings

and

263

Model

the

Caiculations

200pA

+

IO

9

2.00nA

+

I9LA

20.00nA

I9o+

200.OflA

+

IO9mA

I9mA

+

2.00i.tA

transferred should

be

263

and/or

from

obtained

are

be

193A.Acalculated

1

Table

to

within

Model

for

=

j

1

=

Table

the

allowable

1-3.

1-9.

listed

193A

Low

Lower

—

typicallimits.

reading

out

is

Current

Allowable

Limit

.

that

specification.

of

nA

jaA

does

nA

LA

These

Source

Reading**

Upper

+

not

Verification

.

are

limits

within

fall

Limit

nA

j.tA

based

these

nA

iA

on

limits

to

(lj.tA

Typical Limits***

±O.6500nA

±6.500nA

±65.00nA

±O.65OO.tA

±6.500jiA

the 90-day

indicates

lOmA)

speci

a

1-15

SECTION Performance

1

Verification

Figure

1-7.

B.

Schematic

Setupfor

2361237

Equivalent

Low

Current

OUTPUT

Source

H

Ranges

Verification

Note

Eiectrometer

(Measure

(inAtolOmA)

617

Electrometer

:

617

GUARD

dualled

OUTPUT

COMMON

263

Source

(Source

1)

146

Performance

SECTION

Verification

1.

Table

263

617

Range Range

2pA 2pA

2OpA

200pA

2nA

2OnA

200nA

2jiA

2OpA

200pA

2nA

2nA 2nA 2nA 2nA 2nA 2nA 2nA 2nA

2nA

2OnA

200nA

2jiA

1-9.

I=Source

Output Setting

Standby Standby Standby Standby Standby Standby Standby Standby

+O.9nA

—O.9nA

+9nA

-9nA

+9OnA —9OnA

+O.9iA —O.9iaA

Low

Current

236/237 Source Range

inA lOnA

lOOnA ljiA 1OiA

lOOjiA

lmA

lOmA

inA

lOnA

lOOnA

1iA

Source

ISource*

Verification

Source

Value***

OnA OnA OnA OjiA OjiA OjiA

OmA OmA

—O9nA

+O9nA

—9nA

+9nA

-9OnA +9OnA

4O.9LA +k9A

(inA

617

Allowable

to

(18°C

ft45OOpA —2.000pA

-2OOOpA —200.OpA —2.000nA —20.00nA —200.OnA —2.000jiA

315OpA

—29OOpA

—209.OpA

to

28°C)

lOmA)

Readings**

+O.4500pA

to

+2.000pA

to

+20.00pA

to

+200.OpA

to

+2.000nA

to

+20.00nA

to

+200.OnA

to

+2.000jiA

to

+3J5OpA

to

+29.00pA

to

+209.OpA

to

+nA

to

2OnA

200nA

2iA

2jiA

*

236/237

**

Allowable

***

For

compliance

ljtA

the

2OjiA

200jiA

2mA

2OmA

readings

thru

limit set

for

lOmA

+9jiA —9jiA

+9OjiA

—9OpA

+O.9mA

—O.9mA

+9mA

—9mA

to

1A

the ranges,

11V

on

thru

program

the

lOmA

the

1OiA

lOOjiA

imA

lOmA

measurement

UV

ranges

source Mode1236/237

+I9iA

—I9O

+I9O

—Io.9

+IO9mA

—I

+I9mA

range.

are calculated

source

to

—tA

-tA

in

characterized

the

flA

Table

18. Isource

to

+nA

+

+______

+tA

valued

nA

from

Table

1-3.

1-17

SECTION Performance

1

58

up

the

Set

sistor

(R-18540)

1

Verification

1

OOmA

Measure

Verification

equipment

is

installed

Range

as

showninFigure

in

the

test

1-8.

sockeL

The

1O2

7.

Verify

236/237

that

the

current

Within

jS

the

reading

following

(b)

limits:

on

the

Model

re

I

±6pA

=

Io

procedure

This

1O2

resistor value of

paragraph

space

Perform

urement

1.

While

OVonthe

lOOmA.

Set

2. Zero

3,

HI

4,

Remove and 2500E) Place

5. voltage space

Caiculate

6.

follows:

this

of

provided

the rance

the

to

set

requires

for

current

resistor

1.5.1. below:

R

—

10

following

c‘

in

standby,

1.1V

Model

the

Model

and

LO),

the

short

the

output

to

the

Model

measurement

below:

VOrnA=

the

caiculations.

was

Transfer

steps

set

source

193A

to

193A

enabling

from

calibration

OmA.

236/237

actual

characterized value

the

previously

resistance

that

verify the

to

Model

the

range,

the

by

and

2V

dc

shorting

ZERO.

input

the

source

operate

in

from

the

current

through

The

recorded

236/237

compliance

set

range.

its

input

of

the Model

(Models

and

Model

v

the resistor

characterized

in

value

lOOmA

to

(VOLTS

343A

record

193A

of

step

to

meas

source

193A

and

in the

the

43

the

to

as

Set

8.

9.

1O•

the Record late

the

I+9OmA

Velif)7 236/237

ii.

12.

13.

the

Set Record

late

the

L-9OmA

Verify 236/237iSwithin

calibration

the

actual

V+9A

that

is

1236

voltage

V+9QmA

within

current.

—

Rion

the

current

I+9OmA

source

from the

=______________________

the

±((O.0008)

calibration source

the

actual

v

90

that

voltage

V-9OmA

Rio

the

from

current.

=

=______________________

current

the

output

to

Model

reading

following

I+9OmA

output

to

the

Model

reading

following

193A

V

(I)

limits:

+6.tA}

—9OmA.

93A

v

(b)

limits:

+9OmA.

and

mA

on

the

and

inA

the

on

calcu

Model

calcu

Model

IOmA=

VoA

RioQ

=___________

1-18

mA

14.

Place

1236

the

I-9OmA

Models

±((O.0008)

343A

and

I-omj

+6i.tA}

236/237instandby.

Waming:

to

Safety

Ground

Earth

Performance

SECTION

Verification

1

Figure

1-8.

Connections

A.

343A

DCCalibrator

8.

Schematic

Setup

for

lOOmA

Source

Equivalent

+

.-

Measure

Range

2500

Current Calibrator (Source

—.

+

OUT

IN

-.-.-

Verification

.:.

o

1

93A

DMM

E

1)

1O2

—€

236/237

(7

(Measure

OUTPUTFU

6ö

Qo

1)

-::T

149

SECTION

Performance

1

5

9

Setupthe

sistor

(R485-1O)

1

Verification

1

OOmA

equipment

is

Source

showninFigure

as

installed

in

Range

the test

Verification

1-9.

sockeL

The

1O2

7

Verify

lowing

that

limits:

the

current

(JOmA)

15

withrn the

fol

actual

re

OIflA

JOmA

±2OLA

This

procedure

lfl(2

resistor

value

of

this

of

paragraph

graph. vided

Transfer

below:

Perform the range:

While

1.

OmA

1.1V.

to

2. 3,

4,

5.

the

Set Zero HI to Remove Place voltage

svace

for resistor

1.5.1

Rio

following

in

standby,

on

the

Model

the

Model

LO),

and

the

Model

measurement

below:

V0m=

requires

current

was

and

that

resistance

=

lOOmA

193Atothe

193A

enabling

short

from

236/237

the

characterized

caiculations.

previously recorded

also

used

in

valuetothe

the

by

the

from

to

Model

shorting

ZERO.

in

verify

range

2V

dc

inputofthe

operate

the Model

steps

set

source

The

the

236/237

and

range.

its

V

value

characterized

in

lOOmA

to

compliance

set

input

(VOLTS

Model

and

record

193A

of

step

para

pro-

source

193A.

in the

the

43

10.

11.

12.

8. 9

Set

the Record late

the

I+9OmA

Verify lowing

Set

the Record late

the

L9o

Model 236/237

the voltage

current.

actual

V÷9omA

V+9QmA

Rio

the

actual

that

limits:

I+9OmA

Model

the

actual

V9o

=

89.9141flA

236/237

voltage from the

current.

=

7

v

-9OmA

Rwe

to

from the

output

Model

+9OmA.

193A

V

=______________________

current

to

(I+9o)

90.0861UA

to

output

Model

within

is

-9OmA. 193A

V

=______________________

inA

mA

and

calcu

the

calcu

fol

6.

follows:

Calculate

Io=

the

actual

VoA

R

1o0

current

=___________

through

the resistor

mA

as

13.

14.

Verify

limits:

Place

that

L9OmA

the

=

Model

actual

current

89,914fllA

236/237

to

in

standby.

is

within

90.O86IflA

the

following

1-20

Perforinance Verification

SECTION

1

121

SECTION

.

calibration

2

2i

Calibration the shows any error,

manual.

sentative

Calibration IEEE-488

bration

INTRODUCTION

performance

that

of

the calibration refer

If

or

bus.

procedures,

QuickBASIC

Manufacturer

should

the

to

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of

that

be verification

Model

the

troubleshooting

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factory

the

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This

section

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canbeused.

performed

236/237

cannot

steps

persists,

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further

236/237

contains

a

program

Model

every

procedure

is

out

be

information

call

your

information.

is

performed

the

written

12

months, or

(Section

of

specifications.

performed

Keithley

stepbystep

in

Table

24.

Description

without

in this

repre

over

the

ca1i

Microsoft

Required

1)

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if

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22

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any

of

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complete information.

RECOMMENDED

the following

the controls

CALIBRATION

procedures,

and

Operation

236/237

make

of

Opera

EQUIPMENT

Table

24

lists

that

Note 9Oday

the

specifications

equipment

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Test

Equipment

Specifications

recommended

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may

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263

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calibration

193A

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in

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table.

accuracy

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equipment.

their

Alternate

is

Table

2-2.

at

Keithley

263

193A

8006

R-185-10 R-249-100 R-263-lk R-263-100K

5-1/2digit Calibrator/Source

5-1

digit

/2

Test

102

1002

1k2 100k2

Resistor

DMM

Fixture

Resistor

2nA,

2OnA

200nA

200mV, 20V-1000V 2002-200k2

±OJ%, ±0.1%, ±0.1%, ±0.1%.

range;

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±10 ±20 ±10 ±10

ranges;

±(O.035%

ranges;

ppm/°C ppm/°C ppm/°C pvm/°C

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10

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10

+

counts)

2

counts)

+

1

+

count)

counts)

2-1

SECTION Calibration

2

22,

Table

Specifications

For

Alternate

Equipment

23

Calibration ditions a

2A

ENVIRONMENTAL

having

relative

WARMUP

The 3wire ground grounded

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outlet

electric shock,

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power

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PERIOD

WARNING

Measure

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CONDITIONS

performed

temperature

less

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Keithley

24)

9nA,

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263

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Table

24)

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memory

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Figure

24

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2.6

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to

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CALIBRATION

step-by-step

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PROCEDURES

for

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Calibration

that

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all

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The

three

2.6.2),

procedures

SECTION

Calibration

2

(paragraph (paragraph

Calibration the

IEEE-488

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of

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socketofthe

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SECTION

Calibration

Waming: to

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Figure

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13.

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lOOk2

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SECTION

2

Calibration

from

the

and

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measure

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voltage

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2

3

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25

SECTION

Calibration

2

29.

30.

31.

32.

33,

34,

35,

On

the range Repeat Measure

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Set

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cancel

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calibration calibration

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2.6.2

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in Figure

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23. the Model

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send

common

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to

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the

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in

24

interlock

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SECTION

Calibration

2

Ground

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A.

Connections

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UARO

A

ARD

Fixture

Test

8006

236/237

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Figure

6.

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as

2-7

SECTION

Calibration

2

10.

11.

12.

13.

14.

15.

16.

Send

L1V

Send

bus

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11V

Send bus

Send

11V

range:

C6X

with

C7,VsX

range:

C8X

with

C9,VsRX

range:

c10x

with

C11,VMsX

range:

the

following

the rneasured

the

C7

the

following

the

measured

the

C9

the

following

the

measured

the

Cli

the

following

command

!

Source

voltage

command

!

Calibrate and

measure range

source

to

-O.OOOOV

reading

follows:

as

offset;

commandtosource

!

Source

voltage

-4.0000V

reading

commandasfollows:

!

Calibrate

and

command

!

Source

voltage

command

!

Calibrate

and measure

command

gain;

measure

to

+00.000V

reading as follows:

offset;

to

range

source

range

source

—0V

(VsR)

4.1V

4V

(VsR)

—1.1V

source

+0V

(VsR)

+11V

+10Vonthe

on

over

source

on

over

on

over

source

the

20.

21.

22.

23.

24.

25.

26.

Send

the

11V

range:

C16X

Send

the

bus

with

C17VMsX

Send

the

nov

range:

C18X

Send

the

bus

with

C19X,VMsX

Send

thefollowing

110V

range:

C2OX

Send

the

bus

with

C21,VMsiX

Send

the

110V

range:

C22X

following

measured the

C17

following

measured the

C19

measured the

C21

following

command

!

Source

voltage

command

!

Calibrate

and

command

!

Source

voltage

command

!

Calibrate and

to

-4OOOOV

reading

follows:

as

gain;

measure

to

+000.00V

reading as follows:

offset;

measure

source

range

source

(VsR)

range

commandtosource

!

Source

voltage

+100.00V

reading

(VMSR)

commandasfollows:

!

Calibrate

and

command

!

Source

gan;

measure

to

—000,00V

range

source

4OV

over

(VsR)

-41V

source

+0V

over the

+110V

source

+100Vonthe

over

+110V

source

—0Vonthe

on

the

17.

18.

19.

C12X

Send bus

with

C13,VMsX

Send

11V

range:

C14X

Send

bus

with

C15,VMsX

the

measured the

C13

following

measured the

C15

!

Source

voltage

command

!

Calibrate

and

command

!

Source

voltage

command

!

Calibrate

+10.000V

reading as

follows:

gain;

measure

to

——00.000V

reading

as

follows:

offset;

and measure

2—8

(VMSR)

+11V

range

source

(VisR)

-41V source

range

over

source

—-0V

over

on

the

27.

Send bus

Send

28. 110V

Send

29.

bus

Note:

Steps

calibrating

the

measured

with

the

C23

C23,VMsRX

the

following

range:

C24X

the

measured

with

the

C25

C25,VMSRX

through37apply

30

Model

the

voltage

command

!

Calibrate

and

measure

reading

as

follows:

offset;

commandtosource

!

Source

voltage

command

!

Calibrate

and

236,

measure

only

proceed

—100.00V

reading

as follows:

gain;

to

(VMsR)

range

(VsR)

——110V

range the

step

over

—110V

—400V

over

Model

38.

source

on

source

237.

the

If

30.

31.

Send

1

100V

v1x

C26X

Send bus

with

C27,VMSRX

the

range:

the

following

measured

the

C27

command

!

Enable

!

Source

voltage

command

!

Calibrate source

to

source

1100V

+0000.0V

reading as

follows:

offset;

and

measure

+0V

range

(VMSR)

+1100V

on

over the

range

the

39.

40.

when

the calibration switch C59X

over

After 236/237

the

Place

the following

Send

1100V

the

Model

can

the

to

the

sending

Wffl

Model

range:

stillbe

“in“

bus

the

return

236/237

done by

position,

that

in

C59X

to

236/237

command

is

order.

normal

in

turned

setting

sending

and

command,

operation.

standby.

the

over

SECTION

Calibration

off.

Permanent

the calibration

COX

the

Model

disable

bus

to

2

and

32.

33,

34.

35,

36.

37,

38.

Send

the

C28X

Send

the

bus

with

C29,VMSRX

the following

Send

1100V

C3OX

Send

the

bus

with

C31,VMSRX

the

Send

C32X

Send

bus

with

C33,VMsRX

Send

the

Note:

sired “out“

C59X

following

measured the

range:

measured

the

following

the

measured

the

following

Check position; for

temporary

C29

C31

C33

that

command

!

Source

voltage

command

!

Calibrate

and

command

!

Source

voltage

command

!

Calibrate

and

command

!

Source

voltage

command

!

Calibrate

and

command

CAL

the

“in“

for

calibration.

!

Exit

constants.

to

source

+1000.0V

reading as

follows:

gain;

measure

to

—0000.0V

reading

follows:

as

offset;

measure

to

source

—1000.0V

reading

as

follows:

gain;

measure

over

LOCK

permanent

calibration

(VMSR)

+1100V

range

source

(VMSR)

—1

range

(VMSR)

—1100V

range

the

switch

calibration,

+1000V:

-0V

100V

—1000V:

bus:

is

in

store

and

over

source

on

over

source

over

source

the

cal

the

de

or

VOX

2.6.3

calibrate

To in

Figure

is

one

ment

of

this

the

characterized

2.6.1,

Perform the source

1.

2.

3.

4,

5,

6.

24.

that

characterization

calibration

characterized

step

and

Temporarily 236/237

the

Set

enable

then Re-connect

fixture.

test

Place mode

standby.

the

Over

to

enter

c0x

Note:

will

C59)

over

sent

the

Send

100mA

C34X

lOOmA

the

lOOmA

102

The

was

previously

is

value

in

the

43)

=

R

10

following

measure

disconnect

the

from

Model

the

cannot

All

range:

193A

ZERO

the

Model 236/237

be

IEEE-488

the

calibration

other

ignored

be

bus.

the

following

!

Disable

Range

range,

resistor

procedure.

highly

of

the

below:

space

steps

range:

fixture.

test

DMM

cancel

to

output

entered

bus,

!

Enter

calibration

unless

command

Source

!

1100V

Calibration

connect

installed

characterized

Note

dependent

the

102 resistor

1OQ

calibrate

to

output

the

to

any

the

Model

of

in

operate.

the

with

send the

mode:

calibration commands

the

to

+000.00mA

range

circuit

the

in

the

in

that

on

the

resistor.

(see

of

2VDC

offset.

236/237

The

Model

following

command

CO

source

shown

test

fixture

the

accuracy

Enter

paragraph

lO0mA

the

the Model

range

calibration

236/237

command

mode

through

(Cl

+OmA

equip

and

to

first

is

on

of

the

in

the

position,

willbe

entered

“out“

cal

briefly

constants

If

the

switch

“TEMPORARY

dicate

that

is

newly

in the

CAL“

the

displayed

will

message

to in-

lost

be

From

7.

the voltage

space

the

below.

display

drop

of

across

the

Model

the

102

193A

resistor

DMM,

(Vio)

record

in

the

2-9

SECTION Calibration

2

v

100

=

8.

Caiculate the following

9.

Send bus

I+OmA

the

with

actual

caiculation:

vb

0

R

100

calculated the

C35

offset

-

=______________________

current

command

current

reading

as

follows:

2-10

v

(I+o)

(I+OmA)

mA

using

over

the

10.

lt

Send

From the space

voltage

C35,I+mX

the

following

C36X

the

display

drop

below.

v

100

=

of

across

!

Calibrate

source

command

!

Source

the

Model

and

to

+90.00mA

1O2

offset;

measure

source

193A resistor

v

+lOOmA

+9OmA:

DMM,

(vboo)

range

record

in

the

SECTION

2

Calibration

the

with

calculated

the

C41

Send

actual

12.

Ca1culate

ing

the

caiculation:

current

(I+o)

using

follow-

the

21.

bus

current

command

reading

as

(I-9o)

follows:

over

13.

14.

15.

16.

I+9OmA

the

Send

with

bus

C37,I÷9oX

the

Send

lOOmA

C38X

From

the

voltage

the

below.

space

Caiculate

following

=

calculated the

following

range:

vb0

v1o2

R

1o

C37

display

drop

=

the

actual

caiculation:

=________________

current

command

Calibrate

!

source

command

!

Source

of

the

across

offset

Model

the

reading

follows:

as

gain;

measure

and

source

to

-000.00mA

193A

lO2

resistor

v

current

mA

(I+9o)

+lOOmA

—OmA

DMM,

(Vio)

(Lo)

over the

range

on

record

in

using

the

Note: sired

“out“

Send

22.

If

the

“TEMPORARY

dicate when

calibration

switch C59X

After

236/237

Place

23.

C41,L9oX

Check

position;

temporary

for

the

following

C59X

switch

that

Model

the

to

over

sending

wffl

the

Model

that

is

newly

can

the

return

‘in

in the

CAL“

stube

“in“

bus

the

236/237

!

Calibrate

and

the

CAL

for

calibration.

command

!

Exit

constants.

entered

236/237

done

position,

in

that

C59X

to

measure

LOCK

permanent

“out“

willbe

order.

normal

in

gain;

switch

over

calibration

position,

briefly

cal

constants

is

turned

setting

by

sending

and

command,

Operation.

standby.

4OOmA

range

isinthe

calibration,

the

bus:

and

store

message

the

displayed

will

Permanent

off.

the calibration

COX

the

source

cal

to

lost

be

and

Model

de

or

in-

17.

18.

19.

20.

LOmA

Send

with

bus

C39,I-oX

Send

C4OX

From

voltage

the

space

Caiculate

ing

caiculation:

I—9OmA

=

the

below.

vb0

v1o

Rio

calculated

the

C39

following

display

drop

=

the

actual

v1o2

Rio

=______________________

Source

Model

the

reading

as

follows:

offset;

and measure

source

to

—90.00mA

193A

1O

resistor

current

command

!

command

!

of

the

across

Calibrate

source

v

current

=______________________

(I-9O)

using

mA

(Lo)

—lOOmA

—9OmA:

DMM,

(V1o)

mA

range

the

over

record

follow

263

2-5.

Io9flA

to

263

Calibration

calibrator

characterized

The

and

Im)

calibrate

in the

2.6.1)

inA

the

from

possible

range

to

of

the

equipment

and

through

front

cur

be

can

the

liiA

re

in

I9LA,

were

steps

ranges:

NOTE

Model

the

Ranges

Model

Figure

I9OIA,

used

determined

(paragraph

calibrate

to

lowest

the

bus,

AUTO

Current

2.6.4

the

in

Coect

Model236/237 I-source

Model

throughlomA

characterization

corded

Perform lOflIA

Low

(1

the

values

263

in

Table

following

the

measurement

If

controffing

panel,

rent

always

range.

nA1OmA)

characterized

shown

as

(Io9A,

are

that

ranges

procedure

2-3.

the

select

Over

used.

enable

and

O.9nA

to

entered

263

OPERATE.

in

with

calibra

The

theModel236/237

2.

In

standby,

GUARD. Place

mode

tion

in

standby.

set

the Model

cannotbe

the Model

236/237

2-11

SECTION

Calibration

2

6172

2-SIot

3Lug

Triax

to

adapter

Female

Figure

Over

3. to

Note: C59)

sent

4.

Send

25.

the

1EEE488

enter

the

cox

All

other

will

be

over the

thefollowing

C42X

Note

:

263

Current

bus, send

calibration

ignored

bus.

command

263

Source

(Source

GUARD

enabled

Ranges

Calibration

the

mode:

!

Enter calibration

commands

unless

the

over

!

Calibrate range

1)

(inAtolOmA)

following

command

CO

the

1EEE488

offset;

command

mode

(Cl

inA

through

is

first

bus:

measure

11.

12.

13.

14.

Note:

Calibration

Place

the

Send

the

C46X

Note:

Calibration

Place

the the Model Send

the

Model

following

Model

236/237.

following

0000BOB

takes

in

263

command

!

Calibrate ure

takes

in

263

command

00:,

10

seconds

standby

range

4

seconds

OPERATEtosource

and

over the

offset;

to

over

the

o

complete.

setitto

bus:

lOOnA

complete.

bus:

9OnA.

meas

9OnA

to

10.

5,

6.

7,

8.

9,

Note:

Place the

Model

Send

C43,O.9E9X

Note:

Place Send

C44X

Note:

Place

Model

Send

C45,9E—9X

Calibration

the

Model

236/237.

the

following

Calibration

the

Model

the

following

Calibration

the

Model

236/237.

the

following

takes

263

20

in

OPERATE

command

!

Calibrate

range

takes

263

in

standby

20

command

!

Calibrate

ure

range

takes

10

263inoperate

command

!

Calibrate range

seconds

over

gain;

to

the

to

complete.

source

bus:

inA

O.9nA

measure

secondstocomplete.

and

over

the

offset; lOnA

seconds

to

source

over

the

gain;

setitto

to

lOnA

9nA.

bus:

meas

complete.

9nA

bus:

measure

to

the

C47,9OE9X

!

Calibrate

gain;

lOOnA

measure

range

to

15.

16.

Note:

Place Send

Calibration

the

Model

the

following

C48X

takes

4

secondstocomplete.

263instandby

command

!

Calibrate

and

over

offset;

setitto

the

bus:

1iA

O.9iA.

measure

range

17.

Place

the

18.

Send

IO9iA

command

C49,Io9AX

Model

(from

as follows:

263

Table

in

OPERATE.

over

23)

!

Calibrate

the

gain;

bus

ljiA

with

measure

the

C49

range

For

example,

if

Io9LA

O.90036jiA,

=

send

C49,O.9OO36E6X.

19.

Place

the

20.

Send

the

C5OX

Model

following

in

263

command

standby and

!

Calibrate ure

range

over

offset;

set

the

lOjiA

itto9j.tA.

bus:

meas

242

SECTION

Ccilibration

2

21.

22.

Place

the Model

Send

I9A

command

C5l,I9AX

(from

as

263

Table

follows:

OPERATE.

in

over

2-3)

Calibrate

!

the

gain;

bus

with

lOjiA

the

C51

measure

C58X

Note: takes

Calibration

approximately

Calibrate

!

ranges

the

of

four

bw

minutes

inA

current

lOmA

to

source

complete.

to

source

ranges

range

calibration

the

and

displayed

off.

the

sending

in

standby.

isinthe

bus:

store

cal

the message

to

willbelost

Permanent

calibration

and

COX

the

Model

de

or

in

that

is

newly

can

stillbe

“in“

businthat

the

return

the

“in“

command

the

in

entered

position,

the

263

for

permanent

calibration.

!

EXit

constants.

“out“

will

done

order.

C59X

normal

to

and

236/237

Check

23.

24.

25.

26.

Place

the

Send

C52X

Place

the

Send

I9oA

command

C53,I9oAX

Model

following

Model

Table

(from

as

follows:

in

263

command

!

263

in

!

standby

Calibrate

ire

range

OPERATE.

over

23)

Calibrate

and

over

offset;

the

gain;

set

the

bus

1OOtA

it

to

bus:

1OOiA

with

90j.tA.

meas

the

C53

measure

range

bus:

imA

O.9mA.

measure

27.

28.

Place

the

Send the

C54X

Model

following

263

in

command

!

standby

Calibrate

and

over

offset;

setitto

the

range

;

29.

30.

Place Send

the Model

(from

IO9mA

263 Table

in

OPERATE.

over

23)

the

bus

with

the

C55

Note:

position;

sired

for

temporary

the following

38.

“out“

Send

C59X

If

the switch

“TEMPORARYCAL“

dicate

that

when

the calibration switch C59X

After 236/237

Place

to

over

sending

will

Models

the

Model 236/237

the

CAL

switch

LOCK

over

calibration

position,

be

briefly

cal

constants

is

turned

by

setting

and

command,

operation.

commandasfollows:

31.

32.

33, 34,

35,

36. 37,

C55,Io

9

X

the

Place Send

the

C56X

Place

the

Send

I9

command

C57,I

9

X

Place

the

Place

the

Send

the

Model

following

Model

Table

(from

as follows:

Model Model

following

!

in

263

command

263

263 263

command

Calibrate range

standby

!

Calibrate

ure

range

operate.

in

2-3)

!

Calibrate

range

in

standby operate.

in

over

gain;

and

over

offset;

the

gain;

and

over

imA

set

the

lOmA

bus

lOmA

set

the

measure

itto9mA.

bus:

meas-

with

the

measure

ittoOmV.

bus:

C57

2.7

CALIBRATION

Calibration

could

occur

Tt5important

CAL)

errors will

do

error

occur,

not

IN some they

bration

calibration.

Since

calibration

the

Model

reasonitis

this

be

The

detected

to

errors gram. required

bus:

errors

during

realize

to

calibration

cause

guarantee

occurs,

error

236/237,

strongly

following

detect

and

subsequent

calibration

that

default specified

find

and

messages

they

recommended

and

displayed

steps

calibration

ERRORS

explained

are

anyofthese

if

is

compromised.

cal

accuracy.

fix

the

are

be

can

provide

easily

by

errors

error

messages

in

errors

Even

constants

When

problem

briefly

displayed

overlooked.

that calibration

the

generalprocedure

the

over

that

Table

(except though

used,

to

be

a

cali

and

repeat

calibration

pro-

IEEE-488

2-4.

by

For

2-13

SECTION Calibration

2

Message IN

CAL

IN

STBY

CAL

COMPLI

CAL

MODE

CAL VALUE

CAL

ADC

ZERO

CAL

ADC

GAIN

ERR

Table

24.

Calibration

Expianation

Tried

mands the front operations

The

Model

cuted

Compliance

the

to

set

instrument

to

include;C(calibration),N(operate/standby),

panel, only

are

236/237

Note).

(see

has

operate/standby

ignored.

isinstandby.

occurred

during

settings.

Common

The

Invalid

cal

constant

calibration

mode

calibration

from the

value

tempted). Calibration constant

Measure

ceptable stead. ment

Measure

ceptable

stead. ment

offset

limits. The

Possible

(or

connections), gain calibration

limits. The

Possible

connections),

(or

calibration

transmitted

problems

transmitted

problems

error.

include;

or defective

error.

include;

or defective

Error

that

a

state

The

is

illegal

output

and

calibration

calibration. Check

OutputofModel

error.

calibration

the Model

to

from

Calibration

value

incorrect

Model

is

236/237.

is

cal

Calibrationisattempted

valueisignored

incorrect

Model

cal

236/237.

Messages

whileinthe

0

sense

command

test

236/237

willbeused.

This

calibration

attempted

and

a

default

constant

andadefault

constant

calibration

(output

canbeset.

setup

calibration will be

sense)

over

sent

connections

is

shortedorunit

not

used.

All

step

usingavalue

cal

constant

value, defective

using

value,

value

a cal

constant value

defective

mode.

Legal

andU(status)

illegal

commands and

the

bus

and

is

ignored

will

instrument

thatisnot

valueisused

calibration

thatisnot

within

calibration

com

From

notbeexe

is

defective.

(not

within

equip

ac

is

used

equip

at

ac

in-

CAL

Note:

transition interlock

In

this

ignored.

SRC

During

from

was opened.

event,

The

ZERO

GAIN

the

execution

OPERATE

the

OPERATE

front

panel message

Source ceptable stead. ment

Source ahle Possible

offset

limits.

Possible

(or

connections),

gain

limits.

problems

connections),

ofa

calibration

to

STANDBY.

to

STANDBY

“IN

STBY“

calibration

The

transmitted

problems

or

calibration

The

transmitted valueisignored

error.

include;

or

defective

stepinwhich

This

can

transition

is

occur

is

detected

displayed

theModel

becauseitwas

Calibrationisattempted

error.

valueisignored

include;

defective

Calibrationisattempted

incorrect

Model

236/237

and

when

the

this

incorrect

Model

cal

236/237.

takes

specifically

measurement

occurs.

cal

constant

236/237.

andadefault

constant

measurement

a

programmedtodo

conversion

usingavalue

andadefault

value, defective

usingavalue

cal

value,

defective

conversion,itis

usedtocompute

cal

constant

calibration

or

because

so,

thatisnot

constant

thatisnot

valueisused

possible

the

valueisused

calibration

within

equipment

instrument

the

test fixture safety

the

calibration

within

equip

constant

ac

in-

accept

instead.

(or

can

is

244

SECTION

Calibration

2

1.

Program

the an errorbysending When

2. and

Display the

3.

from refer

SRQ

an

then

address

the Model

to

Figure

Model

occurs

the

charaCter

236/237

26

236/237togenerate

the

to

determine

M32 (error), Model

string

on

command

send

236/237

Error

(U

the

Computer

the

Most

Significant

Least

Significant

an

SRQ

over the

bus.

theUicommand

talk.

to

Status

Word)

CRT

and

of

Bit

error.

Identifier

Bit

Trigger

IDDC IDDCO Interlock Illegal Illegal

Invalid

Log

Autoranging

In In Unitisa236

DU IOU IOU DPRAM

DPRAM

Cal

Cal Cal

Cal

Cal Cal Cal Cal Cal

type

Significant

After U7

command

Display

displaying

on

4.

5. Word)onthe

to

determine status LOCK

ERSbbb..bbb<TERM÷EOI>

J

L

I1

26Bit

ASCII

String

Error

0

=

No

1

=

Error

Overrun

Present

Measure

Source Range

Sweep

Cannot

Calibration Standby

DPRAM EEROM

Cal

ADC

ADC SRC

SRC

Common

Compliance

Value Constants

Invalid

Mix

Cross

Source

Failed Failed

Checksum

Lockup Link

Error

Zero

Error

Gain

Error

Zero

Error

Gain

Error

Mode

Error

Range

Zero

Eror

with

Error

Pulse

the

word switch.

Least

Sweep

the

address

and

character

Computer

whiCh

also

provides

Significant

Ui

error status

the

string

CRT

Calibration

Bit

word,

Mode1236/237

Calibration

(U7

to

refer

and

step

the

status

send

Figure

failed.

of

the

to

talk.

Status

This

CAL

the

27

2-6.

Figure

lii

Error

Status

Word

2-15

SECTION Calibration

2

dentifier

c

s

Figure

2.8

The Mode1236/237.

p

n

n,

a,

b

<TERM

+

1

2-7.

EOI>

1

0=Unit

is

[__

—

1

=

0

=

1

=

Calibration

U7

Calibration

Unit is

Ca

Lock

Ca

Lock

(Present

Uncalibrated

Calibrated

Switch

Ca

Constants

Step

in

Progress

Status

is

Unlocked

is

Locked

Word

Will

NotbeSaved)

and the

CALIBRATION

following

software

program.

program

Configure

per

manufacturers

PROGRAM

can

the

used

be

recommended

instructions

to

calibrate

equipment

and

type

the

in

246

‘1.‘.

‚

****************************************************************************

‘*

kuisnnt

.*

193A

‘*

Comput.r:

‘*

IUE—48S

t*

Op.ratiag

‘*

Prograsmirig

‘*

Bus

‚

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C

adn..

drivr:

1O1119O

R.quir.d:

IBM

int.rfac

mysta:

languag•: Microsoft IOt.ch

—

10;

PC,

1.4.1

231237

Modi

236237

or

AT

cospatible

card:

PC—D

Drivir4SB,

193A

addrn

!Otch,

NS—DI,

ot

Calibration

DIN,

1o41

—

16; 263

CEC,

version

QuickBASIC

nrsion

or

2.3

National

CLS onIoN DII DIN

BASE char(5), Err$(9)

FORI1TO5:READchar$(I):NEXTI FORI1I‘08:READIca1(I):NEXTI FORI1W4:R!ADssg$(I):NEflI

FORI1I09:READErr$(I):NBXTI

Dlya3

‚

*******************

1

cbarS(5),

Ical(8),

INITIALIZE

msg$(4)

IEBE—488

Dimension Rsad

Read

R•ad

Rad

N.asura.nt

INTERFACE

Progra

263

addr.n

3.0

vrsion

or

latr

prompt

aal

proodun

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Calibrator,

a

tate

4.0

or

PC-‘II

or

arrays.

strings.

ourrents.

nssag.s.

m.ssagn.

dlay

*************************

10

ohm

IM

lat•r

(

nconds).

*

rnistor*

* *

* * * *

OPEN OPEN

Stet:

PRINT PRH?! PRINT PRINT

“DBVIflEOUT“ “‘iDEVI!EEIN“

01, 01, 01, 01,

PEIlT

01,

IOCTL

CIß

LOCATE PRIWI‘ LOCkTE PRINT LOCATE GUB

‘*****************

12,

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“

22,

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14,

K.yCh.ok

SeiCal: CLS

Cl

0:

E

—

PRINT

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1

—

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NEXTI

PRINT

cal cal

INPUT <1OR

—

InCal: IF 1!

PRINT

01, “RESET“ “RENOTE“ “GLEAR“ “TINE “LOL“

20

2361237

12

R•f•r to

10

0

—

function to

4

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1;

“;

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cal

1

OR

cal

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01ff

30“

SELECT

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calibration

>

4 4

—

OUTPOT

INPUT

Calibration

S.rvio

FUNCTION(S)

calibrate:“

msg$(I);

THEN THEN

BEEP: 005DB

AS

02

Nanual

11

‚

t

‚ ‚ .

1

‚ ‚

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lt

‚

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“

calibration“

funotion 0070

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TypeCheck

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30 Enable Clear

coapl•t•

Ch.ok

IEEE—488

IEEE4CS

interfao.

start

raot•

devioe

second

Local

screen.

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for

CALIBRATE

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for

cal

Get

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•

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clear.

bus

oprator

counter.

all

type

output input

enable. tue

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4

seleotions.

(236

path.

th.

out.

signal.

or

237).

‚

PRINT PRINT PRINT PRINT

11, 111 lfl,

#1,

‚

“OUTPUT “OUTPUT “OUTPUT “OUTPtJT

INITIALIZE

16;M32,X“

BO

‚

16

‚

X“

;

16;OOX‘ 16;KOYOX“

236/237

‘

236/237 Zero Local Enable

SRQ

bias

sensing.

EOI,

error,

on

output

level

hold—off,terminator,

for safety.

•****k**

PRINT

IF

MID$(ST$,

IF

PEN

ON

INPUT

LINE

END

ON

PEN

PRINT

tk*********

ON

cal cal

IF

END

IF PR1NT PRINT PRINT PRINT PRINT

Cl

IF

PR1NT

INPUT IN$

=

IF

IN$

PRINT CLOSE END

“OUTPUT

#1

‚

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111,

BEEP PRINT PRINT PRINT

cl

GOSUB

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#1,

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4

=

GOSUB GOSUB GOSUB

:

BEEP

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#1,

msg$(cal

“error(s)

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=

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1

“Rerun LEFT$(

=

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“LOCAL“

#1,

CLOSE

1:

#2,

ST$

7,

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=

1

KeyCheck

ErrCheck

SRQ“

CalVolt,

THEN

CalVolt CalHigh CalLow

);

PRINT

calibration

IN$

‚

OR

2

16“

)

1

“

1)

IN$

CHECK

07X‘

16

;

=

“i“

236/237

ENABLE

CalHigh,

cal

detected

“NOTE:

=

CAL

THEN

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ibration

program

“Y“

THEN

LOCK

Cal

will

BUS

be

SRQ

PROGRAM

CalLow

procedure

during

Calibration

GOTO

SWITCH

Lock

switch

only

ERROR

LOOP

calibration.“

(y/n)“;

SeiCal

STATUS

‘

Request

‘

Address

‘

Input

‘

Check

is

temporary.“

TRAPPING

‘

Point

1

Enable

Send

DCL.

completed.“

is

temporary.“

IN$

t

Restore

‚

Ciose

9

End

of

cal 236/237

statue

cal cal

lock

in

locked

to

error

SRQ.

local

1/0

files.

program.

ibrat

deteotion.

operation.

ionstatus

to

talk.

word.

switch

position.“

routine.

word,

status.

6

‚

*

Cal

Volt:

VOLTAGE

CLS

FUNCTION

CALI

BRATION

ROUTINES

PRINT PRINT FR1NT PRINT

GOSUB

PRINT

PRINT PRINT PRINT PRINT PRINT PRINT PRINT BEEP PRINT PRINT PRINT PRINT PRINT GOSUB PRINT PRINT PRINT PRINT FOR

1

=

IF

1

IN$

=

PRINT GOSUB PRINT

INPUT

1

=

PRINT NEXT PRINT PRINT PRINT RETURN

“Voltage

Service

“See

“Short

KeyCheck

“OUTPUT

In,

“OUTPUT

1A1

“OUTPUT

IAI,

“Performing “Please

“OUTPUT

#1,

“OUTPUT

1

‚

#

“OUTPUT

#1,

‘OUTPUT16

‚

111

“Remove “Make

KeyCheck

“OUTPUT

111,

“OUTPUT

#1

‚

“Performing “Press

TO

2

=

26

THEN

INKEY$:

“OUTPUT

#1, Delay

“ENTER

#1,

Vmr

1/2,

+

1

“OUTPtJT

111,

1

“OUTPUT

1/1,

“OUTPUT

1/1,

“OUTPUT

1/1,

Cal

236/237

wait

short

sure

ESC

Cmax

PRINT

IF

ion

ibrat

Manual

Procedure,“

for

output

1O;FOROS3GIX“ 16;N1X“ 16;COX“

common

mode

approximately

16;C1X“

0

1

X“

1

Z

;

16;C59X“

NOX“

;

236/237

from

236/237

output

16;N1X“

COX“

16

;

voltage

to

IN$

16;C“;

abort

#1,

CHR$(27)

cal procedure

“OUTPUT

1.;

10“

16;C“;

1;

16;C59X“ 16;NOX“ 1O;ZORSX“

details

193A

and

adjustment.“

30

output

is

ibration,“

THEN

“X“

Vmsr;

“,“;

on

input,“

econds

properly

and

1O;R5X“‘

PRINT

test

‘

•

and

•

restart

•

“X“‘

•

Put Put

connections,“

DCV,

193A

236/237 236/237

for

Calibrate Zero19

Remove

236

Put

193A

connected

236/237

Put Put

236

for

Loop Put

193A

“CLEAR“:

111, Send Wait Get

cal for

reading Input Increment

Send

Loop

back calibration

Exit

236/237

Put

Disable

61/2

in in

completion.“

236/237

3A.

236/237

/237

in

input.“

to

in

/237

in

program.“

cal

all

1000V

on

command

settling.

from

reading.

193A

C

command

value

cal

for

in

zero

193A

digits,auto

operate

cal

common

from standby.

193A

operate. cal

polnts.

range.

GOTO

to

193A.

to

standby.

mode,

mode.

cal

input.“

mode,

SeiCal

236/237.

value. 236/237.

cal

mode.

mode

point.

100V

range.

•

f

‚

100MA

CalHigh: CLS

mA

PRINT PRINT

“100

“See

Current

Service

Manual PRINT GOSUB

KeyCheck

PRINT

“OUTPUT

PRINT

InRes: IF

PRINT

1/1,

INPUT

RIO<9

“Disconnect

.

9

“Enter

OR

1O;FOROS3GIX“

characterized

>

RiO

236/237

CURRENT

Range

10.

1

Calibration.“

for

test

THEN

output

RANGE

connections.“

value

BEEP:

from

CALIBRATION

DCV,

193A

•

10

of

PRINT

test

ehm

“Value

fixture.“

ROUTINES

6—1/2

resistor“;

out

of

digits,auto

RiO

range.

“

GOTO

:

range.

InRes

GOSUB PRINT PRINT GOSUB PRINT PRINT PRINT PRINT FOR

1

IN$

=

PRINT GOSUB PRINT

INPUT

=

Imsr

I=1+1 PRINT NEXT

1 PR1NT PR1NT PRINT RETURN

•

•*

•

KeyCheck IAI,

“OUTPUT

‘Connect

236/237

KeyCheck

“OUTPUT

IAI,

“OUTPUT

IAI

‚

“Performing

TO

34

“OtJTPUT

‚

ESC

41

IF

“Presz

=

INKEY$:

1/1

Delay

lfl,

“ENTER

112,

Vmsr

Vmsr1RIO

1,

“OUTPUT

1

‚

#

1‚“OUTPUT

“OUTPUT

11

1

‚

IFI‚“OUTPUT

1NA

10;

Z1X“

output

16;NIX“

COX“

16

;

lOOmA

to

abort

16

CHR$(27)

C“

;

IN$

10“

C“

1

6

;

16;CS9X“ I6;NOX“ IO;ZOR5X“

1OMA

range

procedure

1

“X“

;

1

“‚“

;

CURRENT

to

test

calibration

THEN

msr

1

;

RANGE

•

Enable

fixture.“

Put

‘

•

Enter procedure.“

and

restart

•

Loop

PRINT

;

•

“X“

•

‘

#1, Send Settl

Get

Compute

Increment

•

Loop Exit Put Disable

CALIBRATION

236/237

for

cal

reading

Send

back cal

236/237

193A

mode.

ca

1

program.“

all

“CLEAR“:

command delay.

ing

cal

C

ca1val

for

procedure.

I93A

ROUTINES

zero

operate.

in

lOOmA

GOTO

to

from

193A.

current. command

ue

to

in

zero,

cal SeiCal

236/237.

value, 236

cal

1000V

points.

1237.

point,

range,

CalLow: CLS PRINT PRINT

“lnA

“Hake

PRINT

NPUT

1

KeyCheck IAI,

GOSUB PRINT

•

CharCheck:

=

IN$ IN$

“Enter

LEFT$(

INPUT IN$

IF IF

PRINT

InChar:

PRINT

“See PR1NT FOR

1

=

PRINT

INPUT

char(

1 NoChar: FOR

1=1

char(1)

IF

—

sure

“OUTPUT

263

CHARACTER

“N“

=

<>

“y“

PRINT

Service

TO

1

TO

BEEP PRINT GOTO

lOmA

263

IN$

‚

OR

IN$

AND

“Enter

5 parameter

)

5 0

THEN

“Improper

InChar

and

Range

236

Current

263

O6;F1ROW1X“

ION

ZAT

1

characterization

1) THEN

“n“

=

<>

ehe

“Y“

following

for

IN$

Manual

for

characterization

Calibration.“

1237

are

PARANETERS

parameters

GOTO

THEN

BEEP:

263

characterization

“

263

char$(1);

;

properly

•

263

NoChar

OOTO

characterization

‘

Loop

•

Input

Loop

‘

parameters

connected

amps,auto

(y/n)“;

CharCheck

for

“

‘

;

parameter.

back

(

see

range,guard

IN$

parameters.“

procedure.“

all

parameters

Prompt

for

presently entered,“

for

Service

parameter,

parameter.

Manual

on.

)‚“

IF

END NEXT

1 PRINT GOSUB PRINT PRINT PRINT PRINT

=

1:

J FOR

1

IN$

=

PRINT GOSUB PRINT GOSUB

1=1 PRINT GOSUB

>

IF

1

PR

ELSE

IF

END

GOSUB

J=J+ PRINT

1NA 1

NT

PR PRINT

1

NT

PR

GOSUB

PRINT

PR1NT

PRINT

1

NT

PR

PRINT

1

NT

PR

1

NT

FR

RETURN

KeyCheck

“Performing “Press

“OUTPUT

1/1,

“QUTPUT

IAI,

1

K

=

TO

42

=

INKEY$:

“OUTPUT

#1

‚

Delay

“OUTPUT

1/1

‚

Delay

+

1

“OUTPUT

IAI,

Delay

THEN

47

PRINT

K=K

#

NT

1

Delay

1

“OtJTPUT

1/1,

1

1OMA

“OUTPUT

#1,

“OUTPUT

111,

“OUTPUT

‚

#1 Delay

“TIME

#1,

BEEP

: “Performing “Please

“OUTPUT

1/1,

“OUTPUT

1/1,

“OUTPUT

In,

“OUTPUT

In,

“TIME

IA1,

to

ESC

57

IF

#1,

+

1

‚

“OUTPUT

1

SOURCE

QUT

wait

OUT

—

inA

lOmA

abort

16;NIX“

16;COX“

V“

6

1

;C“;1;

CHR$(27)

;

IN$

08;

O8;O1X“

“OUTPUT

6

1

08;OOX‘

CALIBRATION O8;F2R1X“ 08;VOX“

;O1X“

08

240“

—

InA

lOmA

approximately 16;C58X“ 16;C59X“ 16;NOX“

08;OOX“

30“

current

procedure

Ical(J

“X“

16;C“;

C“;1

;

source

THEN

);

1;

‘‚“

;

3—4

measurement

and

PRINT

“X“

“,“;

1

;

calibration.“

minutes

restart

‘

1

‘

t

char(K);

‘

ca

1

‚

1

9

‚

1

9

e

‘

236/237

Put

236/237

Put

Initialize

Loop

1A1,

for

“CLEAR“: Program Allow Send Settl

cal

ing

Increment

263

Put Settling

characterized

Use

Increment (.3)

“X“

;

Settling

Increment

263

Put

back

Loop

200mV

263

OmV

263

Put

Select

for

236/237

Cal

Put Put

236/237 236/237 263

Exit

Restore

calibration

program.“

in in

array

all

current

263

settling

offset time.

C

command

operate.

in

time.

“X“

array

time.

array

in

standby.

for

tange.

output.

in

operate.

minute

4

completion.“

standby.

in

30

sec.

operate.

cal

index

points.

cal

GOTO

time.

command

values

counter.

index,

1nA-10mA

cal

mode.

standby.

in

bus

procedure.“

mode.

counters.

SeiCal

value.

to

value.

for

cal

point.

time

out.

source,

out.

time

236/237.

>lOOnA

KeyCheck: PRINT

“Press

SPACE

or PRINT Lpl: Lp3:

IF

IN$

IN$ IN$

=

INKEY$:

=

INKEY$:

=

CHR$(27)

IF IF

THEN CLS PRINT PR1NT PRINT PRINT

“Program

“CLEAR“

#1

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SECTION

3

31

This and

troubleshoot

32

A

rear switch the

Source

(line

fuse),

INTRODUCTION

section

Other ter section personne1 unless steps

voltages

if served.

voltage

cleaning,

normal

LINE

panel

(see

Measure

perform

contains

than

are

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may

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FUSE

fuse

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switch

the

information

the Model

WARNING

line

fuse

the

for

use

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located

3-1)

Unit.

setting

following

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236/237.

replacement

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to

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to

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precautions

potentially

in

and

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procedures

Troubleshooting

injury

are

REPLACEMENT

adjacent

protects

If

the

changed

steps:

the

fuse

to

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needs

or

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the

to

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90-125V

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3.8

the

by

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/2A,

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VOLTAGE

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the

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Make connected equipment

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CAUTION

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the

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Figure

34.

1.

FAN

Model

out

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of

the

dust

on

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the

off

to

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instrument

from

PC

boards

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cleanliness

following

the

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CLEANING

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The

case.

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and

to

236/237.

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must

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the

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off

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3-1

to

in

SECTION

Maintenance

3

into

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element, Position

2.

rear

panel.

the

righthand

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the

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all

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When

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BAERY

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12

hours

eight

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years.

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instrument

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that

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236-332).

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canbemounted

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REPLACEMENT

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2.

3,

4. 5,

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3,

location). non-metallic

the

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the

all

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3.6).

batteryison

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as

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least

at

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the

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minutes

three

remove

digitalboard

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the

of its

line

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for

internal

top

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holder

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for

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of

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5,

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polarity (+)

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the

top

on the

battery

cover.

taking

faces

care

battery

up.

observe

to

holder.

proper

The

plus

3-2

IEEE

Connector

SECTION

Maintenance

3

Figure

32.

Digital

Board

Pl

9

33

SECTION

Maintenance

3

AND

35

HANDLING

CLEANING

PRECAUTIONS

When instrument, touch natingthem

The

troubleshooting

care

PC

board

traces

with covered by impedance nation

same

in

parts parts,

be

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to

1.Using taminated sufficient board. Usingasmall,

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3,

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4,

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5,

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3.6

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itisnecessarytotroubleshoot placeacomponent, dure.

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should

Figures

shield

a devices or

could

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general precautions

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the

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to

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not

parts.

DISASSEMBLY

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the Model

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thoroughly wet

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physically

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replacement,

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touching

INSTRUCTIONS

the

use

should

3-6.

steps

following

be

depend

not

other

foreign

circuitry

performance.

apply

the flux

areatobe cleaned.

the area

wipe

the

board

from

the

fresh, clean

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cleaned,itshould

clean

air

the

to

the

instrument

in

done

onapreviously

pertaining

working

to

236/237

around

apply

airornitrogen.

could

the

disassembly

the

inside

indiscriminately

avoid

contami

matter.

have high

where

when

at

affected area,

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replacing

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some

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checktosee

board

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to

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the

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to

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NOTE

on

the

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the connectorisa

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Disconnect the from minutes discharge

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on single

prevent

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screws move Slide

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completely

When proper that

ternal curedby#6-32 are

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is

to

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leaving the instrument in screwstosecure

the

use plied with

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it

isareceptacle.

that

connector

the

instrument,

allow

to

before

the

top

coverissecured

top

Four

and

two

six

screws.

the

top

the

bottom

remove

the

bottom

screw.

damage

use

#6-32

screws

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provided in kit

after

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bottom

reinstalling

screwstoinstall

circuit

located

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the

four

cover

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bottom

separates

long

boards.

x

by

feet

a

short

the

prefix.A“P“

or

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plug

matestoreceptacle

that

WARNING

line

cord

and

high

voltage

beginning

cover

arc

cover

CAUTION

will

5/8“

#6-32x1/2“

rack,donot

rack

follows:

as

locatedatthe top

are

located

towards

completely

cover

as

the

cover

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unitorinternal

to

x

1/4“

securedtothe

is the rearofthe

at

screws.

cover

from

the bottom

the

cause

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screws,

off

in ordertoinstall

the

bottom

screws

mount

illustrations

indicates

while

type,

For

example,

and

wait

follows:

four

bug

to

towards

four damage front

screws.

(#6-32x114“)

kit.

test

any

least three

at

capacitors

disassembly.

the

at

the

plastic

Phillips

secure

the

cover,

feet.

cover.

the

chassis

rear. Remove

rearofthe

from

chassis

instrument.

the

chassis.

to

feet

rear

original Instead,

to

footissecured

and the

use

in-

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P10

leads

of

the

feet

circuit

pan

bottom

rear until

use

the

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the

in-

are

se

feet

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sup

to

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by

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chas

located

with

two

by

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a

it

3-4

J17

SECTION

Maintenance

3

Figure

3Ifthe

follows.

A.

B.

c.

D

4,

For board

Note: the the

A.

B.

c,

3-3.

cooling

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Disconnect

board

(see Disconnect Remove the

rear

Pull

the

Model

Figure

(see

resonant

The digital resonant

board.

Remove

board.

verter Disconnect from

J23

Figure

(see Carefully the

instrument

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When board, protect shield.

Resonant

the panel. fan

converter board.

the

whichislocated

make sure

the

fan

needs

P22

Figure

the

ground

four

outofthe

237,

3-3)

Figure

shield

ltissecured

P17

3-2).

lift

the

reinstaffing

wires,

case.

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proceedtostep

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3-2).

fasteners

remove

as

converter

from

resonant

the

are

to

be

from

wire

instrument

follows:

3-2

that

covers

J17,

two

installed

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removed,

J22

from

that

the

resonant

board

indicates

with

and

on the

converter

the

resonant

cable

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4. on

the

secure

case.

is

mounted

the

resonant

four

screws.

disconnect

digital

board

clamps,

the

in

237)

proceed

the

digital

panel.

rear

the

fan

converter

location

board

out

converter

which

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the

as

on

to

of

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5.

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sure

cool wait move

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B.

c.

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output

the

output

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until

the

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der

the

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to

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the

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output

P16

3-2).

the

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the

is

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output

board

boardismounted

the

rear

WARNING

from

sinkonthe

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fromJl6

screws

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inches.

board. board

Figure

(see

panel.

excessive

output

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the

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on

that

analog

lift

and

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analog

out

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the

3-4)

heat,

digitalboard

secure

board.

up

the

board

the

instrument

on

make

board

output

P15

directly

as

follows:

the

re

to

the

from

analog

is

(see

output

board

J15

un

case.

3-5

SECTION

Maintenance

3

P16

Figure

Remove

6. A.

B.

c

D.

E.

F.

3-4.

Remove the analog Remove log Disconnect from Disconnect digital board. Disconnect PUT Disconnect J12

Output

the

analog

the

board with

J19.

banana

LO

J13

and

analog

board

inner

P19

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the

Board

board

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board

with

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three

screws.

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P18

and

berg

jack

from

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P17

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Figure shield.

four

screws.

ltissecured

from

cable

fromJ8and

connector

J27.

only)

237

as

3-5)

ltissecured

to

digital

J18

the

for

from

follows:

the

ana

board)

on

the

OUT

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right

side

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board.

remaun

from

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board

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lt

of

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the secure the Place

to

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assembly

1.

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us

secured ung the

instrument

the

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case

analog

unstmmentunthe

the

carefully

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outofthe

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the

to screws board,

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on

remove

board

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analog

from

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the

to

of

board

the

seven

mounting

the normal

the

case.

the

by

component

upright

analog

analog the

five

36

SECTION

Maintenance

3

rear

P20 on

secure

paneL

the

side

the

paneL

little

Board

panel

assembly

lhie

(ac

the

digital

instrument,

the

1EEE488

screws

four

panels

securethe

also

clearance,

and

then

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ifiter)

board.

ofthe

pull

disconnect

that

fan

the

Figure

3-.5.

7.

Remove

A.

Disconnect J20

B.

At nuts that to

Remove

c.

panelto these the

D.

To ward

Analog

the

and

the

backofthe

the

rear

screws

rear

provide

a

J22

Removed)

as

follows:

(fan)

the

Two

assembly

panel

(Trigger

from

two

out

and

P22

remove the

interfaceconnector

attach

instrument.

filter

rear

P21

of to

8.

and board.

E.

Separate

To

provide shock, ground cooling

Remove

Interlock)

the

protection

when

reassembling

wires

from

are

fan

digitalboard

the

J21

fromthe

from

ac

(see

on

possible

power

Figure

from

rear

panel

WARNING

the

connectedtothe

the

make

rear

digital

instrument

electric

the

sure

outlet and

panel.

as

follows:

32)

board.

case.

34

SECTION

Maintenance

A.

Disconnect

J24.

B.

Place bottom are eight

securing rails. nut screw

Remove

c.

digitalboard let moved.

Place

D.

position case.

E.

Remove

board.

board

237, must to

9,

Remove

At

A.

B.

Remove

the

a.

b.

3

the

instrument

of

the

screws

the

The

Phillips

on

the

first

and

the

digitalboard

the

and

the

This

by four

the

bottom

firstbe

the

digital

the

display

the front

each

side

panels

From

inside

screwdriver decorative Carefully

engages

the

display

instrument

digital

other

make

other

to the

instrument

remove

top

and bottom

shield

screws.

shield

removed.

board

panel,

of

as

into

strip

push

from

(seven

board

head

side

sure

seven

mounting

fall

assembly

with

board

pull

the

four

follows:

the

one

is

outwards

one

board

on

its

case,

slotted

to

screw

of

the

not

screws

when

in

the

digital

Note

for

the

This

four

as

follows:

off

the

decorative

case,

of

secured.

of

the

ribbon

left

side.

notice

and

the

three

installs

board,

to

lose

that

rails.

the

last

the

normal

board

shield

is

secured

that

resonant

shield

screws.

rotary

place

the

holes

until

fasteners.

cable

one

into

Remove

the

secure

Be

sure

screw

for

the

on

the

is

also

knob.

strips

thin

a

where

the

from

From

the

that

there

Phillips)

mounting

a

kep this

kep

nut.

the

not

is

re

upright

from

the

digital

to

the

Model

converter

secured

from

blade

the

strip

dis

Pull

c,

Note:

cessed

strip

c.

Remove the panel

front

the

D.

Loosen bezel

E.

The above erly

bezel Lift

the

instrument

procedure.

seated

to

10.

properly

must

To boards,

head

cover

To

replaced

be

prevent

screws

after

ensure

safety ground ceptacle)

the

rear

strip

the

To

reinstall,

part

the

at

four

assembly

panel

four

the

assemblies assemblies

display

can

and

secured,

made.

To

damage

#6-32

use

providedinkit

removal

WARNING

continued

hazards,

and

wire

fan

(green

panel.

away

from

align

of

the

side

locationsofthe

screws

to

the

side

assembly from

Allen

set

front

to

the

from

the

board

away

be

re-assembled

Make

sure

that

and

that

ensure

and

CAUTION

fastened

unit

to

x

1/4“

proper

or

long

to

feet.

of

protection

verify

that

attached

ground

are

the

panel

fasteners.

that panels

the

screws

panel.

front

from

all

operation,

securely.

internal

Phillips

secure

power

to

ac

connected

panel.

side

strip

in

and

press

secure

and

the

disengage

chassis.

securing

Remove

panel.

front

panel.

reversing

by

parts

are

connections

circuit

pan

bottom

against

line

power

re

the

front

prop

shields

to

re

the

the the

the

are

3-8

k)

0

wcDN

Co

3

ro

37

SPECIAL

HANDLING

SENSITIVE

DEVICES

OF

STATIC

suchaslogic

ment, could

alsobehelpftil.

analyzers

and

capacitance

SECTION

Maintenance

checkers,

3

CMOS

power

bw builds destroy

the

Use

1.

ICs tainers Typically, containers their Remove

2. only

ground

Handle

3,

the

4,

Any be ble,

5,

Use Use

6. 7,

Once mally can

devices

uponyour

following

pins.

inserted

operateatvery

consumption.

devices,ifthey

these

should

specially

these

original

the

ataproperly

yourself

the

printed

only

antistatic

only

grounded

the

deviceisinstalledinthePCboard,itis

adequately

resume.

high impedance

As

personorciothing

are

precautions

be

transported

designedtoprevent

parts

of

plasticorfoam. containers

devices from

with

devices

circuit

must

alsobegroundedtothe

protected,

wffl

until

grounded

a

suitable

only by

board

solder

type

solder

tip

to

their

into

any

result,

a

may

not

handled

avoid

and

handled

receivedinantistatic

be

Keep

ready

protective containers

work

wrist

the

body; do

which

sucker.

irons.

and

static

sufficient

be

damaging

only

static

these

devices

for

installation.

station.

strap.

the

deviceisto

benchorta

normal

levels

that

properly.

them.

in

con

buildup.

Also,

not

touch

nor

handling

for

Table

to

Equipment

function

Five

basic

0.1% input

1OM

in

Dual-trace, sweep 50MHz

Digital

oscilloscope,dcto

frequency

3.8.2

The

Model

biities

to

Recommended

3-2.

Equipment

DMM

with

accuracy,

dcV impedance

triggered

counter

Diagnostics

has

236/237

aidintroubleshooting.

some

Troubleshooting

Use Power

voltage signal logic levels.

Digital

waveform

Checking cies.

supply

checks;

tracing

and

internal

and

analog

continuity,

analog

checks.

clock

frequen

diagnostic

dc

capa

38

The

tion

basic individual test cedures. tentoassist

tion.

cian.

tion ing.

38.1

Successintroubleshooting Model nician, equipment. for

TROUBLESHOOTING

troubleshooting is

intended

understanding

should

equipmentaswellasordinary

The

information

in

Isolation

Note

drawings,

are

ofaspecific

that

included

information

for

usebyqualified

of

analog

alsobeexperiencedatusing

isolatingadefective circuitorcircuit

schematic

which

are

in

Section

Recommended

relies

Table

depends

on

the useofaccurate,

lists

3-2

the

236/237

but

troubleshooting

and

presented

component

diagrams

an

essential

5.

Test

complex

not

only on

the

equipment

Model

containedinthis

personnel having

digital

troubleshooting

and component

here

lefttothe

is

aid

to

circuitry.

has

been

troubleshoot

Equipment

equipment

the

skillofthe

reliable

recommended

236/237.

Other

sec-

The

typical

pro-

writ

sec-

techni

loca

like

tech

equip

the

test

a

Power-up

power-uporwhen

On

236/237

ments.Ifa sages

Perform

1.

2.

The ment

and

performsaseriesoftests

failure

displayed.

are

the following

Enable

“MEMORY Press blank menu more front

Note: The

J1x

front

MENU

ENTER.Ifthe for

item.

over

panel

failures

MEMORY

occurs,

TEST“.

coupleofseconds

a

Otherwise,

panel

Memory

the

bus.

messages

are

explained

TEST

theMemory

one

steps

and

use

messagestobe

Test

more

or

perform

to

the

rotary

test passes,

and

failure

a

also

can

associated

follows.

as

run,

is

memory

on

its

front

theMemory

knob

the

display

will

cause

displayed.

run

be

with

memory

the

panel

to

by

Model

ele

mes

Test:

display

will

one

sending

ele

or

3=11

SECTION Maintenance

3

Message

CAL

INVALID

CAL

CONSTANTS

IoU

CAL

ERR

CHECKSUM

UNCALIBRATED

DPRAM

IoU

EEROM FAILED

DPRAM

FAILED

LOCKUP

LINK

ERR

Expianation

On

powerup,

Model

One

will

fective

Checksum peated

There

tive.

The

tionaL

The

236/237 needs

or

more calibration

used.

be

E2ROM

testofcalibration

failures

are

no

Note

that

dual-port

The

DPRAM

E2ROM

(U33)

tional.

The

source/measure

EPROM

(U13), tional.

Communications source/measure

this

message

Try

re-calibrating

(U33).

may

indicate

calibration

the

Source

for

RAM

(U12)

in

(U17),

error

controller.

wffl

indicate

toberecalibrated.

constants

are

the Model

constants

a

defective

constants

Measure

the

may

the

I/O

controller

or

microprocessor

in

the

storedinmemory.

indicator

I/O

controller

be defective.

controller has

cannot

DPRAM

unit

The

that

one

not

within

236/237.

failed.

Try

E2ROM

light

has

failed

respond

(U25)

between

(U12)

is

non-functional.

or more

allowable

Repeated

re-calibrating

(U33).

The

blinks.

failed

making

the

to

failure.

I/O

The

the

calibration

limits.

failures

the

E2ROM

the

instrument

controller

instrument

controller

I/O

errors

Default

may indicate

instrument.

maybedefec

(U33)

instrument

due

is

exist.

cal

constants

non-func

RAM

to

non-func

and

the

The

de

Re-

1F

2F

Note:

in

the

There

are

calibration

error

section

IoU

messages

of

this

RAM

(U30)

EPROM

associated

manual.

failure.

(U31)

with

Unit

failure.

calibration

is

non-functional.

Unit

is

and

non-functional.

are

covered

SECTION

Maintenance

3

Display

When front

onds.

1.

2.

AID

The

which

any

be

Multiplexing

1.

2.

3,

4,

Test

the

panel

Perform

Enable

“DISPLAY

Press

Note:

sending

Test

instrument

allows the

ofits

one

checked

Tum

While Model

until

ton

the

Use

that

the

this

time.

Press

displayed:

display

indicator

the

MENU

ENTER

The

J2X

Mode

A/D

and

in

the

off

holding 236/237.

the

rotary

A/D

ENTER.

is

run

test

lights

followingsteps

and

use the

TEST“.

run

the

to

memory

over

can

A/D

signal

paragraph

Model

MENU

the

be

multiplexer

phases.

tracing

in

Continue

test

bus.

placed

236/237.

the

indicator

knobtodisplay

converter

The

following

are

test.

can

This

to

3.8.5).

MENU

is

all

display

turned

to

rotary

also

in the

(Ui)tobe

allows

the

A/D

button,

holdinthe

to

hirns

running

stffl

message

segments

forafew

on

the

display

run

knobtodisplay

be

performed

A/D

test

stopped

switching

input

hirn

MENU

on.

“A/D

TEST“.

normally

wffl

states

(see

be

and sec-

test:

by

mode

A/D

on

the

but

Note

briefly

EXIT

ENTER

is

the

mode

message

instrument

exit

return

measure

power

shows

3-3

supplies

an

A/D

The

A/D

in

phases

with

from

display

The

is

Power

supplies

voltage

This in test mally. played:

This locked

The

5. A/D AMPS)

To

in

to

6. To

7,

Note:

3.8.3

Table the

at

power

normal

the

various oscillations.

TO

instructional

mode,

test

allowing

following

ZERO

indicates

zero

the

A/D

cycled.

phase.

can

(A/D

useofthe

the

A/D

the

instrument

state,

test

Supply

the various

of

the

checks,

with

an

message

pressing

A/D

the

message

TEST

that

placed

be

A/D

REF,

SELECT

mode,

test

to

press

MENU.

remain

will

Checks

checks

it

is

a

236/237.

good

Model

oscffloscope

indicating

ENTER

converter

will

A/D

the

anyofthe

in

VOLTS

buttons.

press

normal

the

on

the

that

idea

for

signs

will

to

then

converter

ENTER.

MENU

can

In

to

that

exit

run

be

and

source/

made

be

addition

check

of

noise

once

the

nor

dis

is

other

A/D

until

to

the

or

Step

1

2 3

4 5

6

7 8

9

10

Item

Line

+5V

±15V

±30V

+5V

±150V

±15V

+50V

voltage

fuse

power

Digital

Analog

Floating

Isolated

switch

supply

supplies

supply

Table

Component

—

VR1,

VR3,

VR4,

VR5,

VR6,

VR2,

J16,

4

J16,

1

2

J8, J8,pin2 J23,

or

230Vasre-

live

receptacle;

Checks

Remarks

voltage

Line

Remove

Reference Reference

Reference

Reference Reference

Referenced

selection,

fusetocheck.

to

floating

to

to to

to

digital

floating

floating output

common.

output

common.

3-13

2 3 3 2

3 3

3-3.

Power

Required

Set quired. Check Plugged

power +5V +15V,

—15V,

+30V,

-30V, +5V,

115V

to

for

on

±0.25%

±1V

±

±0,25%

Supply

Condition

continuity

into

2V

+150V,±20V

±

20V

1V

10V

1

—150V, +15V, ÷15V,±1V +50V,

SECTION

Maintenance

3

38A

Control 1er,

are

and

analog eration. control open.

These

drive analog voltage to

drive

Analog

lines,

used

to

switches

That

is,

line

will

controllines

relay

coils,

switches.

levels

these

To

check

ence

the

On

the

link

from

sis

grounded ments wise,

instrument

referenced

erroneous

Control Lines

managed

drive

the

associated

an

appropriate

cause

the

(located

of

gates

The

following

that

should

switching

voltage

measurement

Model

levels

CAUTION

236/237,

output

common

equipment

measurements

damage may

the

by

various

respective

on

switching

be

devices.

NOTE

on

to

floating

to

source/measure

relays,

with

analog

voltage

level

switch

schematic

FETs,

summarizes

present

control

floating

remove

when

to

make

on

lines, common.

the

using

ground.

or

result.

switching

circuitry

present

to

236426,

and

the

control

refer

ground

chas

measure

Other

possible

control

FETs

on

dose

pagel)

inputs

nominal

lines

op

or

of

a

+5V=switch

Other

control

devices

are

described

COMPLIANCE

the

Model

0V.

POLARITY

erence

236/237

Otherwise,

for

the clamping programmed at nominally

output,

lOOmA

current the at

38.5

Tables mostofthe

ous openating

lOOmA

+5V.

this

lineisat nominally

RANGE

limittothe

range

On

the

Analog

3-3

through

analog

open

that

lines

as

Used is

in

compliance, this

+5V

is

on this

Usedtoprovide

forapositive

+10V.

When

BIAS

—

output

(source

other

current

Switching

provide

3-8

circuit

conditions.

are

not

usedtodrive

follows:

for

compliance

line.

the

circuits.

(+)

When

output,

programmed

—10V.

to

Used

With

stage.

or

measure),

ranges

the switching

switching

detection.

controlline

appropriate

the

this

foranegative

select

the

this

this line

devices

switching

10V

instrument

control

appropriate

instrument

control

is

at

0V.

states

for

the

When

is

ref

line

(—)

on

line

van-

at

is is

is

of

Relay

Drive

K8,

K9,

OV

=

+5V=relay

Kl,

K3,

OV=relay

+5V=relay

FET

Switch

N-channel

OV=switch —15V

P-channel

OV

=

+15V

Analog

OV=switch

KlO,

relay

K4,

FET;

=

switch

FET;

switch

=

Switch

KIl

switch

K5,

K6,K7and

switch

Drive

closed

switch

Drive

closed

and

open

K12;

closed

open

closed

(on)

(0ff)

(on)

(off)

(U45,

K15;

U48

and

U49)

Current

closed for plies

to

Ranging

each

both thatonthe1nA closed.

Table

3-4,

Range

lOOmA

lOmA

lmA

lOOpA

lOiiA

ljiA

lOOnA

lOnA

lnA

of

sounce

nange

Analog

Relays Closed

Table

the

nine

and

noneofthe

K8

K9 K9

K9

KlO

K1l

K12

3-4

lists

curnent

measure

cunnent

Switching

Range Switches

Q5-Q9,

U45A, U45A,Q12,Q13

U45A,

U45A, U45A,Q4

U45A,Q4

U45A, U45A,Q4

the

switches

ranges.

curnent

This

ranges. Notice

nange

nelays

Current Ranging

Closed

Q37,

Q38

Ql0,

QIl

Q4, Q14

Q4

that

table

ane

ap

are

3-14

Volts closed applies

Rangmg

for each of

both

to

Table

the

source

hsts

35

available

and measure

the

voltage

switches ranges.

voltage

that

This

ranges.

are

table

K15 in

standby.

and

K5

wffl

dose

whenever

SECTION

Maintenance

the

instrumentisplaced

3

Table

35,

Analog

Relays

Range L1V liv 110V

1100V

Feedback

and

U49

are

two

devices

fiedbytheir

the

statesofthese

ditions

while

Sensing—As select

localorremote

is

ment switches

programmed

wffl

Closed

K4,

K6,

K4, K6,

K7

— —

As

listedinTable

used

for

has

four

circuit

schematic

switches

programmedtosource

listedinTable

default

placedinstandby. That

Switching;

K7 K7

feedback

individual

for

sensing.

for

remote

the

to

is,

relayK3will

Volts

FET

Switches Q24, Q33, Q35 Q24

—

analog

3-6,

switching.

switches

numbers.

standby

and

current

37,

three

relays are

that

Note

when

sensing,

local

sensing

open,

Ranging

Closed

switches

Each of

and

are

The

operate

and

the

states

and

U48

these

identi

table

lists

con

voltage.

used

instru

the relay

when

relays

Table

34,

Analog

Switching

Sensing

Relays*

Sense

Local Remote

*Relay

states

relaysgoto

Output—For disconnect panel

output

off,

relaysKlandK2are

lay

switches placedin while the

Multiplexing

A/D

multiplexer nalstothe clude

Zero,

nal

is

switchedtothe

ing

speed

to

strumentisprogrammedtooperate.

In

the

A/D

safety,

OUTPUT

triax

remain

operate.

instrument

(Ui)

inputofthe

Reference

and

sequence

test

verterislockedupin

K3

Open

Closed

with

236/237inOPERATE.Instandby,

local

sense states.

there

HI

connectors.

open

These

two

is

powered

—

During

continuously

A/D

and

A/D

mode

(see

the

K15

Closed

are

two

and

SENSEHIfrom

When

open.

When

until

the

switches

on.

normal

appliesasequence

converter.

Measure(1or

inputatone

varies

according

paragraph

desired

A/D

K5

Closed

relays

that

the

instrument

turned

instrument then

remain

operation, the

These

Only

V).

time. The

to

the

3.8.2) phase.

are

on,

signals

how

A/D

This

used

the

these

is

closed

of

one

switch

the

allows

to

rear

is

re

first

A/D

sig

in-

sig

in-

con

Table

Switches

Device U48

U49 U48

U49

U48 U49

U48

Pins

6,

6,7

2,

10, 10,

14, 14,

2,

Analog

3-6,

Source1Measure

Standby

7

Closed Closed

Closed

3 11

Closed Open

11 15

Open

15

Open

3

=

Switching;

Operate Open

Open Open

Open Closed

Closed Closed

Closed

V

Feedback

Source

Standby Closed

Closed Closed

Closed Open

Open

Measure

V

Operate Closed

Closed Closed

Closed Open

Open Open

1

3-15

SECTION

Maintenance

3

multiplexer to

the

A/D switch numbers switch.

Table

thatisclosed

38.

AfD Reference

v

1

Measure

Zero

switch

input

of

multiplexer

Analog ing

Phase

Measure

to

states

be

tobechecked

performed.

during

each

UI

are

Switching;

Ui

Switch Closed

and

signaitracing

Table38identifies

A/D

used

6,7 14, 10,

2,3

phase.

to

A/D

15 11

The

identify

Mu1tip1ex

(pins)

the

each

386

The using 3-10.

Note: contained in

sary

that same ware, changes formedbyenabling with

Digital

digital

both

and

display

the

troubleshooting

The

firmware

two

replace oneorbothofthe

to

EPROMs

firmware

perform

the

rotary

The are

dung.

plained in

revision factory

theE2

to

EPROMs

susceptible

ROM.

knob,

Be

suretohandle

paragraph

and

circuitry

that

EPROMs

installed

leveL

initialization

MENU,

and

CAUTION

are

static

to

Display

can

found

data

controls

Factory

then pressing

damage

the Model

and

(U17

the

in

After

displaying

sensitive

by

the

3.7.

Checks

be

checked

in

Tables

Ifitis

U31).

EPROMs,

instrument

instaffing

write

to

initialization

FACTORY

ENTER.

devices

routine

devices

as

out

39

236/237

neces

make

have

new

firm

firmware

is

that

han

ex-

by

and

is

sure

the

per-

INIT

3-16

SECTION

Maintenance

3

Step

1

2

3

4

5

6

7

ItemlComponent

U12,

U13,

U17

U28,pinl8

U28,

(PA6),

8

U28,

U25,

6

(PA4),

9

pin11(PB1),

19

plus34and

37

U30,

(PA7)

pin12(PB2)

35

U31

7

and

(PA5),

Table

U33

39,

Required Condition

Pass and

HL

Switch

Rotary knob

Variable

2MHz

+5V,

Digital

Circuitry

RAM, EPROM,

NVRAM

level

pulse

data

pulse

tests

every

(+5Vor0V)

data

train

HL

±5%

Checks

DPRAM

on

power

imsec

(+5Vor0V)

(0Vto+5V)

up.

Remarks

Display will

controller

I/o

input

Data pressed

Data

input

turned.

Data

outputtodisplay.

Bus

clock

line

Reset

power

up)

lockiffailure

VIA

to

VIA

when button

VIA

when

bw

(goes

occurs.

display

clock

rotary

momentarily

knob

on

8

9

10

11

12

13

14

15

16

U27,

9

U27,

19

U27,

18

U27,

28

U27,

pin24(NDAC),25(NRFD,

26

(DAV),

U14,pinl9

U14,

U15,

U15,pin37

and

pins

pins34and

(PA0PA7)

29

data

35

lines

signal

+5V

every

(Logic

+5V

2MHz

true

Goes mand

Figure

See

ditions

Variable

2MHz

+5V,

±5%

pulsed0Vto

imsec

“1“)

squarewave

(+0V)

is

sent

37

pulse

TTL

when

for

train

required

+5V

(0Vto+5V)

com

con

to

(0V

+5V)

(0Vto+5V)

INT

line

RESET

line

Clock

ATN

line

Handshake

S/M

controller

DatatoVIA

Clock

Reset

line

power

up)

sequence

from

(goes

VIA

bw

data

A/D

to

optos.

momentarily

on

3-17

SECTION

Maintenance

3

Step

1

2

3

4

5

6

7

Item/Component

P24,

15

and

U5,

U6,U9and

OUT1

thru

OUT8

U4,

pins

4-7,

1447

U7,

pins

47,

14-17

pins

4

10

9

8

and

U8,

P24,

16

U1O;

5

Table

Required

+5V,

±5%

Variable

Depress switch

Depress

3-10.

Condition

pulses

any

switch

array

on

any

switch

any

switch

any

switch located

Display

locatedinfirst

schematic

(236-116).

locatedinsecond

locatedinthird

Circuitry

in

fourth

Checks

Remarks

+5V

Segment

Digit

column

of

column.

Pulse

column. Pulse

column

supply

drivers

present

when

present when

button

pressed

pressed.

3-18

41

This

the location

INTRODUCTION

section contains

Model

236/237.

drawings

a

general

Detailed

are

locatedatthe

SECTION

.

Princip1es

functional

schematics

description

and

endofthis

component

manuaL

of

Operation

A

simplified shown two digital by tions. sections

in Figure

sections;

sections

the

use

Separate

4

block

analog

of

opto4solators

ensure

4-1.

are

power

proper

diagram

The

instrument

and

digitalcircuitry.

electrically

for

supplies

isolation.

the

of

isolated

control

for

the

Model

may

and

analog

be

divided

The

from

communica

236/237

analog

other

each

and

digital

Qut

+

is into and

Figure

44

Overall

Block

Out

Diagram

44

SECTION

Principles

42

The with uxed

4

Operation

of

ANALOG

heartofthe

its

complex

asabootstrap plifierisprovided analog

converters rentorvoltage) on oneoffour

appliedtothe

to

be

the

from voltage constant

precision

DAC

and

the

inputofthe

to

levelofcurrent

CIRCUITRY

source scheme

and

amplifier.

by

two

(DACs).

selected

clamps

error

the

feedback

is

of

error

or

an

error

amplifier

feedback elements

Input

stimulus

user-programmed

The

controllingfunction

polarityofthe

allowing

amplifier.

The

configuration

amplifier

voltage

that

the

at

for

source

an

input

output

will

output.

that

along

is

config

am

the

digital4o-

(cur

turns

signal

voltage

applies

effect

a a

The

output

clamps

CR11

ode

output

The

U50.

Op

rent

clamp

The

output

fier

U12

current and

diode

CLAMP).

U19.

Op

voltage

through

form

from

amp

(+1

from the

(xO,1

clamps

CR12

The

amp

clamp

from

resistor

the negative

the1DAC

and

U17

CLAMP).

V

the

1.1V

for

through

form

inverted

U15B

and

CLAMP).

(-V

is

DAC

the

1

networks.

Op

current

is

invertedbythe

form

CR10

diode

DACisinverted

range)

and

resistornetworks.

positive

the

output

ofUl2isagain

CR9

diode

appliedtocurrent

amp

U13

and

clamp

the

by

similarly

Op

voltage

(-4

CLAMP).

amplifier

xl

positive

xl

applied

amp

clamp

ampli

U15A

inverted

the

form

negative

di-

cur

to

(+V

by

Measurement ditioned

multiplexer

a

Before

proceeding maybehelpful function“.Ifthe specific

thenitis rent

is

the

strument

will

not constant comes

the grammed function ance.

In

is

feedback

to

current

and

considered

controlling

into

goes

sourced.

be

voltage

controlling

to

source

unless

the

compliance,

accomplished by

levels

the

clarify

instrumentisprogrammed

compliance,

(compliance

function.

42i

A

simplified V/I tailed cated

V/I

readback

schematic

page2of

on

Control

schematic

circuitryisshown

showing

drawing

Programming current

ageofthe ming

current

and

U22),

theVDAC age

for

respective

with

result

digital-to-analog

two

controls

programming

(U25

output

zero

DAC.

-40V

a

and

Programming

output

routing

for

voltage

analog4odigital

the

to

detailsofcircuit

what

is

meantby“controffing

it

does

indeed

tobecurrent

function.

controlled.

If

for

the

Instead,

the

instrument

voltage).

function. Conversely,

voltage,

instrument

current

voltageisthe

goes becomes

and Readback

and

the

U24).

will

diagram

outputofthe

voltage

result

from

of

in

all

circuit

number

voltage

(DAC)

controls

Programming

with

for

a

the

properly

and

current

(A/D)

converter.

operation,

to

source

that

That

some

reason

programmed

voltage

Thus,

controffing

into

current

the

controlling

the

Figure

V/I

control

4-2.

components

236-126.

sets

the

output

circuits.

1

DAC

the

currentorvolt-

a

0V

output

full

scale

respective

through

source

current,

is,

the

current

sources

when

compli

The

Program

(U23

output

from the

output

DAC.

con

cur

be

pro-

and

de

is

volt-

and

wffl

During wffl The

or ample

operation,

beonat

one time

controllingfunction

wffl

determine

—)

will explain

only oneofthe

control the

to

and

the

which

clamp

this

occurs.

how

precision

four

amplifier

error

programmed

is

on.

The

clamps

polarity

following

(U14).

(+

ex-

it

parts.

divided

1:

This

Example

a

wffl

explain

ingaconstant

the source

in

when

example

circuit

current.

goes

is

operation

Part

into voltage

2

with will

into

two

the

instrument

explain

what

compliance.

Part

sourc

happens

1

a

is

Part1:Assume with

a 27V

compliance

tions

the

instrument

Thus,

20V).

The1DAC

the

at appears outputs the

non-inverting

appears

current

outputs

non-inverting

the

at

approximately

at

the

that

non-inverting

(+)

non-inverting

instrument

the

4k

to

a

is

not

in compliance

the controlling

is

Thus,

—5V.

input

(+)

Positive

—3V.

input

ofUl5A

bad,

negative

ofUl3

input

(+)

lo

wffl clamps.

CR11

be

fed

programmed

is

applyapositive

This

positive

and

CR9B

turning

from

bootstrap

back

(via

input

CR10.

of

the

Since put,

the common verse-bias CLAMP

With the

scribed,

and

U13.

5V

(-5V

+

CLAMP

instrument

REF

±10V

sideofthe

diodes

and-VCLAMP

endofthe

front

will

-5V The

non-inverting(+)

forward-biasing

=

0V)

turns

on.

sourcing

Under

(5mAx4k2

function.

voltage

and

positive ofUl7, voltage

and

negative

U15B.

of

forapositive

voltage voltage prevent

and

on.

amplifier 1

FEEDBACK)

ofUl7wffl

a

As

+5mA

these

condi

appears

voltage

DAC

The

V

appears

voltage

to

will

the

setupas

to

go

result, the

=

at

out

the

re

-1

de

U17

0V

+1

4-2

Principles

SECTION

of

Operation

4

voltage

The

This

20V). This

2V U5B. tive

keeping

CLAMP

drop

voltage

is

fed

The

non-4nverting

remains

across

back

CR12

off.

bad down

is

the

scaled

(viaVFEEDBACK)

of

input

(+)

reverse-biased.

20V

to

As

2V

U15B

a

(5niAx4k2

invertei

and

U15A

to

willgoposi

result,

the

and

+V

Current

=

which

from

turnedon(remember,

is Asaresult, the feedback output that

will

effectaconstant

±10V

REF

will

flow

the

configuration

applyavoltagetothe

+5mA

into

other

error

output

Main

the

clamps are and the

amplifier

current.

To

Output

Stage

+1

CLAMP,

1

DAC

(U14)

off).

Figure

42.

Simplified

Schematic

of

VII

Control

and

Readback

43

SECTION PrinciplesofOperation

Part source one

This

making

2:

Assume

+5mA

reason

bad

4

the

withacompliance

oranother,the

change

voltage

causes

the

instrument

bad

the

source

controffing

is

still

of

27V.

resistance

to

go

function.

programmed

However,

changes

into

to

compliance

for

6k2.

four

and

to

signals

floating

the

A/D

common)

converter

garn

to

as

a

umty

amplifier

The

ence,VMeasure,1Measure

(Ui)

and

multiplexed buffer

U21.

routed

(+10V

refer

are

via

With the the

When

drop However,

into

In inverted, U15A. (3V

CLAMP

Current

CLAMP. the put back above0Vcausing result,

With

trolled.

configuration

(U14)

Bootstrap

error

On xllO switches buffer

4k2

bad,

controlling

the

across

function

bad

resistanceisincreasedto6k2,

the

bad

voltageislimited

compliance.

voltage

voltageatthe

The

3V

+

will

from

With

compliance,

This

3V

non-inverting

=

forwardbiasingCR12.

0V)

turn

on.

±10V

less

input

currentofthe source

voltagetoU17

CR10

the

+1

CLAMP

the

+V

CLAMP

The

output

wffl

applyavoltagetothe

that

wffl

effect

amplifier gain

amplifier(U14)by

the

110V

and

1100V

gainisprovided.

are

closed

providing

between

the

the+1CLAMPison

(as

would

the

27V

is

fed

back

(+)

REF

starts

current

flowing into the+1CLAMP,

of

U14

to decrease.

wffl

cause

to

become

will

hirn

on,

the

from

the

a

constant

is

controlledatthe

the

FET

ranges,

On

the lower

V/I

control circuit

module.

Measurementisaccomplished ditioned FEEDBACK)

digital

unity

BACK.

plifier

switch

voltagc

voltage

feedback

through

(A/D)

gain

Op

converter.

amplifier

amp

U9B

to

is

configuredasa

forVFEEDBACK.

is

Q33

ranges,

closed

the

providing

FET

levels(1FEEDBACK

a

multiplexer Op functionasbuffer

On

switchisopen

making

(5mA

and

in

x

the

down

6k2

explained

30V

be

27V

at

is

scaled

(viaVFEEDBACK)

input

ofUl5A

willgoto

Asaresult,

flowing into the

decreases

its

causing

The

resultant

inputtoincrease

(+)

reversedbiased.

off.

instrument

V

DAC

and

is

voltage

the

error

output

voltage

output

switch

the

switches are

Q24

and

voltage

xli

gain.

Device

and

routing

by

amp

U9Aisconfiguredasa

to

properly

the

non4nverting

the

1,1V

range,

xlO

gain.

On

configuring

current

the

Part

the

voltage

=

source

to

3V

the

feedback

amplifier

of

relay

open

ranges

Ullisa

the

analog4o

for

1

the

30V).

goes

and

0V

the

+V

out

feed

As

con

+27V.

of

the

K4.

and

the

output

con

and

FEED

am

FET

higher

U9B

1).

to

xl

422

The sistsofa outputofthe

Model

The the Model matic and

At

the and the

+150V,

Output

output

simplified

236-126

Q19.

stage

dass

236

of

the

heartofthe

The collector

l2OmA

error

output

(page

Q19iseffectively

Stage

of

the

bootstrap

AB

circuit

schematic

is

showninFigure

output

connected

whose

amplifier.

diagram

stage

2).

stage

Q21iseffectively

of

power

amplifier

controlled by

bias

is

of

the

output

4-3.

The

foundondrawings

is

are

power

supply,

to

the

while the

—150V,

basically

stage

detailed

236-166

transistors

connected

collector

l2OmA

con

the

for

sche

Q21

to of

power

supply.

a

When

programmed

are

zero-biased

the high impedance

across result, zero voltageispresent mon

to

output grammed ased +150V. difference voltage

forapositive

The

(on).

Asaresult,

between

drop verse-biased from

the

output.

Circuitry

manner.

output,

negative

foranegative

When the

Q19

voltage

reverse-biased isolating

(ofß,

common).

voltage

the

across

keeping

(ofO

source

becomes

present

forazero

±150V

The

these

of

at When the

output,

across

drop

voltage

the

supply

Q21.

For

a

the

output

programmed

is

forward-biased,

the

on

the

output,

supplies

the

Q21

present

voltage

positive

negative

functions

output.

output

two

output

becomes

Q21

both

are

transistors.

(floating

source

becomes

outputisthe

the

at

(+150V)

output,

supply

inasimilar

foranegative

resulting

Transistor

from

the

and

Q19

dropped

As

com

is

pro-

forward-bi

less

than

and

Q19isre

isolated

with

Q21

positive

a

the

a

is

supply.

V

are

Bias

for

the

±3OVF VR9).

in age

supplies

This bias

ordertomaintain

thatishigher

ward-biased.

two

Bias

power

and

circuit

than

control

transistors

15V

two

referenced

is

bases

the

outputsothat

the

is

zener diodes

to

of

the

transistorsata

performed

provided

(VR1O

floating common

they

can be

the

by

output

the

and

volt-

for

of

4-4

From

V/I

Contro

Principles

To

V/

Feedback

SECTION

of

Operation

4

4-3.

Figure

4—4

Figure

error

the

nitude

biased mines

amplifier

of

MAIN

and

the asapositive current

higher

Model

The

for

is

output

237

simplified

the

Model

schematic

237-166

For tions

bw

and

voltage,

the

same

Model

Mode!

determines

the

amountofbias

magnitude

MAIN

delivered

voltage.

schematic

237isshown

the

of

236-126

the

as

236

237

(MAIN

of

becomes

to

output

(page

output

one for

Output

drive).

which

output

the

baseofQ21

diagram

in

stage

2).

stage

the

Stage

The

transistor

current

voltage.

more

Figure

is

for

Model

-3OVF

(Simplified

polarity

thatinturn

positive,

for

the

4-4.

found

the

Model

236

and

is

forward—

For

example,

more

resulting

output

detailed

The

on

drawings

237

expiana

(see

Schematic

mag-

deter

bias in

a

stage

func

-150V

(120

Diagram)

for

tion

Model circuitry needed

150V.

for

The

fromaresonant

For

voltage

ward

biased

age

(+5OV),

is

reverse-biased

Q16

1200V

supply

proaches

Q16

the

turns

output

and As verse-biased

the

from

for

bw

Power

negative

(1200V), output,

ner

mA)

236

is

used

programmed

±1200V

outputs

providing

high

from

150V,

on.

voltage

and

output.

current

supply

Feedback

output

to

switch

supplies

converter

of

150V,

source

current

(off)

the

output.

conducts

CR2

150V, Q21

At

exceeds

offdisconnectingthe

hirns

For

>150V,

(limA)

switching

output

voltage.

stage).

over source

the

for

circuit

Q21

output

(l2OmA)

and

therefore As via

suppiy

However,

the

1200V

to

voltages

paragraph

and

diode

237

Model

(see

from

supply. Transistor

disconnects

the

voltage

the

15V

is

effectively

150V,

CR6

high

the

only

connected

is

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4-11

Keithley 236, 237 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual