Keithley 1793 User manual

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KEITH

LEY

INSTRUCTION

MANUAL

Model

1793/6423

IEEE

Standard

488

Output

Keithley

Instruments,

Inc.

28775

Aurora

Road/Cleveland,

Ohio

44139/(216]

248-0400/Telex:

98-5469

■i'

""T-,

/-J:'

:-T

■

—

:««i

WARRANTY

warrant

each

our

products

free

from

defects

material

and

workmanship.

Our

obligation

under

this

warranty

repair

replace

any

instrument

part

thereof

which,

within

year

after

shipment,

proves

defective

upon

examination.

will

pay

local

domestic

surface

freight

costs.

exercise

this

warranty,

write

call

your

local

Keithley

repre

sentative,

contact

Keithley

headquarters

Cleveland,

Ohio.

You

will

given

prompt

assistance

and

shipping

instructions.

REPAIRS

AND

CALIBRATION

Keithley

Instruments

maintains

complete

repair

and

calibration

service

well

standards

laboratory

Cleveland,

Ohio.

Keithley

service

faciiity

our

Munich,

Germany

office

available

for

our

customers

throughout

Europe.

Service

the

United

Kingdom

can

handled

our

office

Reading.

Addition

ally,

Keithley

representatives

most

countries

maintain

service

and

calibration

facilities.

insure

prompt

repair

recalibration

service,

please

contact

your

local

field

representative

Keithley

headquarters

directly

before

returning

the

instrument.

Estimates

for

repairs,

normal

recalibrations

and

calibrations

traceable

the

National

Bureau

Standards

are

available

upon

request.

KEITHLEY

Keithley

Instruments,

lnc./28775

Aurora

Road/Cleveland,

Ohio

44139/U.S.A./(216)

248-0400/Telex:

98-5469

Keithley

Instruments

GmbH/Heiglhofstrasse

5/D-8000

Munchen

70/WEST

GERMANY/1089)

714-40-65/Telex:

521

Keithley

Instruments,

Ltd./I,

Boulton

Road/GB-Reading,

Berkshire

RG2

ONL/GREAT

BRITAIN/(0734)

87/Telex:

847047

Keithley

Instruments

SARL/2

Bis,

Rue

Ldon

Blum/B.P.

60/91121

Palaiseau

Cedex/FRANCE/(6)

011.51.55/Telex:

600933F

Keithley

Instruments

B.V./Leidsestraatweg

149/Postbus

1190

/NL-Woerden/NETHERLANDS/103480)

643/Telex:

311

Keithley

Instruments

SA/Filiale

DUbendorf/Kriesbachstr.

4/CH-8600

Dubendorf/SWITZERLAND/01

821

44/Telex:

536

Keithley

Instruments

Handels-Gesellschaft

m.b.H./DOblinger

Hauptstr.

32/A-1190

Wien

/AUSTRIA/0222

314

289/Telex:

INSTRUCTION

I^IMUAL

MODEL

1793/64;^3

IEEE

STANDARD

488

OUTPUT

1979

KEITHLEY

INSTRUMENTS,

INC.

THIRD

PRINTING,

l^RCH

1981,

CLEVELAND,

OHIO

U.S.A.

DOCUMENT

NO.

30535,

REV.

CONTENTS

SECTION

PAGE

GENERAL

INFORMATION

1-1.

INTRODUCTION

1-3.

COMPATIBILITY

1-6.

WARRANTY

INFORMATION

1-8.

CHANGE

NOTICES

1-10.

SAFETY

SYMBOLS

1-12.

SPECIFICATIONS

INITIAL

PREPARATION

2-1.

INTRODUCTION

2-3.

UNPACKING

AND

INSPECTION

2-5.

MODEL

1793

INSTALLATION

2-7.

MODEL

6423

INSTALLATION

2-9.

MODEL

1793/6423

OUTPUT

CONNECTOR

OPERATION

3-1.

INTRODUCTION

3-3.

OPERATING

INSTRUCTIONS

THEORY

OPERATION

4-1.

INTRODUCTION

4-4.

POWER

SUPPLY

4-6.

PARALLEL

SERIAL

CONVERSION

4-12.

SERIAL

PARALLEL

CONVERSION

4-14.

BUS

OPERATION

4-16.

ADDRESS

ACCEPTANCE

4-18.

DATA

SENDING

MAINTENANCE

5-1.

INTRODUCTION

5-3.

TEST

POINT

DATA

5-5.

1793/6423

VERIFICATION

PROCEDURE

5-7.

ADDRESSABLE

MODE

VERIFICATION

5-8.

TALK

ONLY

MODE

VERIFICATION

5-9.

SPECIAL

HANDLING

STATIC

SENSITIVE

DEVICES

REPLACEABLE

PARTS

6-1.

GENERAL

6-3.

ORDERING

INFORMATION

6-5.

SCHEMATIC

6-7.

COMPONENT

LAYOUTS

1-1

2-1

2-2

3-1

4-1

4-3

5-1

5-2

6-1

ILLUSTRATIONS

Figure

2-1.

Figure

2-2.

Figure

3-1.

Figure

4-1.

Figure

4-2.

Figure

5-1.

Installation

Model

1793,

Installation

Model

6423,

Switch

502

1793/6423

Flow

Diagram.

Timing

Diagram

Isolated

Serial

Data.

PAGE

2-3

2-4

3-2

4-2

4-3

5-1

MODEL

1793/6423

GENERAL

INFORMATION

SECTION

GENERAL

INFORMATION

1-1.

INTRODUCTION.

1-2.

The

Model

1793/6423

IEEE

Standard

488-1978

Bus

Interface

option

that

provides

the

logic

and

control

functions

necessary

interface

the

Keithley

Models

177,

179

and

179-20A

Digital

Multimeters,

the

Model

480

Picoammeter,

and

the

Model

642

Electrometer.

may

either

field

factory

installed.

The

combination

the

Model

1793/6423

and

its

host

DMM,

Picoammeter

Elec

trometer

can

operate

either

the

TALK

ONLY

ADDRESSABLE

mode,

determined

the

setting

internal

switch.

the

TALK

ONLY

mode,

can

send

data

IEEE

compatible

listener

one

seven

switch

selectable

rates,

from

2.5

readings/second

reading/hour.

the

ADDRESSABLE

mode,

readings

may

triggered

non-triggered,

depending

whether

its

odd

even

address

received

from

the

IEEE

controller.

The

internal

switch

settings

determine

the

reading

rate

for

the

TALK

ONLY

mode,

and

its

address

when

the

ADDRESSABLE

mode.

The

Model

1793/6423

provides

output

4-1/2

digit

ASCII

data,

sign,

and

overrange.

1-3.

COMPATIBILITY.

1-4.

The

Model

1793

compatible

with

the

following

Keithley

instruments:

Model

177

DMM

Serial

Number

16500

and

above.

Models

179

and

179-2GA

DMM

Serial

Number

24000

and

above.

Model

480

Picoammeter

Serial

Number

12000

and

above.

NOTE:

The

first

3-1/2

digits

the

output

are

the

same

the

480

display.

1-5.

The

Model

6423

compatible

with

the

Model

642

Electrometer

Serial

Number

53402

and

above.

1-6.

WARRANTY

INFORMATION.

1-7.

The

Warranty

given

the

inside

front

cover

this

Instruction

Manual.

there

need

exercise

the warranty,

contact

the

Keithley

Representative

your

area

determine

the

proper

action

taken.

Keithley

maintains

service

facilities

the

United

Kingdom

and

West

Germany,

well

the

United

States.

Check

the

inside

front

cover

this

Manual

for

addresses.

1-8.

CHANGE

NOTICES.

1-9.

Improvements

changes

the

equipment

which

occur

after

printing

the

Instruction

Manual

will

explained

Change

Notice

sheet

attached

the

inside

back

cover.

1-10.

SAFETY

SYMBOLS.

1-11.

Safety

symbols

used

this

manual

are

follows:

IMPORTANT

The

symbol

may

found

various

places

this

manual.

Carefully

read

the

associated

CAUTION

statements

with

regard

proper

use

and

handling

the

equipment.

Damage

the

equip

ment

may

occur

these

precautions

are

ignored.

This

symbol

may

found

various

places

this

manual.

This

symbol

indicates

those

areas

the

equipment

which

are

potential

shock

hazards.

Carefully

read

the

associated

WARNING

statements

with

regard

proper

use

and

handling

the

equipment.

Serious

personal

injury

may

result

these

precautions

are

gnored.

1-12.

SPECIFICATIONS.

1-13.

Detailed

specifications

for

the

Model

1793/

6423

are

listed

Table

1-2.

These

specifications

are

defined

the

performance

standards

limits

against

which

the

Model

1793/6423

tested.

Table

1-1

lists

general

operating

characteristics

the

Model

1793/6423.

These

characteristics

are

not

specifications,

but

are

typical

operating

charac

teristics

constraints

which

are

included

additional

information

for

the

user.

TABLE

1-1

General

Operating

Characteristics

The

1793/6423

digital

output

low

(pins

and

thru

J501)

intended

connected

ground

point

within

30VRMS

earth

ground.

Common

mode

input

the

meter

shall

not

exceed

lO^V'Hz

guarantee

valid

data

output.

488

BUS

outputs

are

open

collector

with

Power

Up/Power

Down

protection

(No

invalid

information

transmitted

the

BUS).

Maximum

transfer

rate

for

one

entire

reading

(after

being

addressed)

1msec.

1-1

GENERAL

INFORMATION

MODEL

1793/6423

TABLE

1-2

Specifications,

Model

1793/6423

IEEE-488

Output

OUTPUT:

DATA

FORMAT:

4-1/2

digit

ASCII

data,

sign,

and

overrange.

.XXXXX.

^CR

LF,

Sign

(Plus

implied)

Displ

Termi

nator

OVERRANGE

OUTPUT:

ASCII

"OVER"

place

"XXXXX"

LOGIC

LEVELS:

Meets

all

IEEE

Std.

488-1978

specifications.

MODES

OPERATION:

(Selected

internal

switches)

TALK

ONLY:

Allows

user

connect

meter

IEEE-compatible

listener.

Data

outputted

seven

switch

selectable

rates

from

2.5

rdgs/sec

rdg/hr.

ADDRESSABLE:

Allows

user

connect

meter

IEEE-compatible

controller.

Address

selected

internal

switches.

Non-Triggered

addresses

are

even

from

28.

Triggered

address

non-triggered

address

+1.

NON-TRIGGER:

Upon

receiving

its

non-trigger

address,

outputs

the

displayed

reading

TRIGGER:

Upon

receiving

its

trigger

address,

initiates

single

A-D

conversion

and

outputs

the

reading

400

msec

later.

ISOLATION:

Digital

outputs

isolated

from

input

circuitry

(lO^^n,

40pF

typ).

ENVIRONMENT:

OUTPUT

CONNECTOR:

INSTALLATION:

Model

1793

Operate:

55°C,

80%

RH.

Storage:

-25

+70°C.

Model

6423

Operate:

30°C,

70%

RH.

Storage:

-25

+55°C.

24-pin

IEEE-488

standard

connector.

Field

installable,

mounts

within

and

powered

from

meter.

Adds

0.6kg

(1.3

lbs),

watts.

Model

1793

Precludes

1788,

1792

installation.

Model

6423

Precludes

6422,

6428

installation.

ACCESSORIES

AVAILABLE:

1.8m

ft.)

IEEE

Cable

Keithley

Model

7008.

1-2

MODEL

1793/6423

INITIAL

PREPARATION

SECTION

INITIAL

PREPARATION.

2-1.

INTRODUCTION.

2-2.

This

section

provides

information

for

incoming

inspection,

preparation

for

use,

and

installation

the

Model

1793/6423.

2-3.

UNPACKING

AND

INSPECTION.

2-4.

The

Model

1793/6423

was

carefully

inspected,

both

mechanically

and

electrically

before

shipment.

Upon

receiving

your

IEEE

output

option,

unpack

all

items

from

the

shipping

container

and

check

for

any

obvious

damage

which

may

have

occured

during

transit.

Report

any

damages

the

shipping

agent.

Retain

and

use

the

original

packaging

materials

reshipment

required.

The

following

items

(Keithley

Part

No.

parentheses)

are

shipped

with

all

orders

your

option:

Model

1793

PC-524

Assembly

(30370D)

Shield

Assembly

(30I07C)

Replacement

Top

Cover

(30409C)

copy

this

Instruction

Manual

Separate

Optional

Cable

(Model

7008),

ordered.

Model

6423

PC-524

Assembly

(30494D)

Shield

Assembly

(30133B)

Back

Panel

Assembly

(30496A)

copy

this

Instruction

Manual

Separate

Optional

Cable

(Model

7008),

ordered.

2-5.

MODEL

1793

INSTALLATION.

2-6.

The

Model

1793

installed

internally

the

Model

177, 179,

I79-20A

480

and

powered

its

own

line

operated

power

supply.

Installation

the

Model

1793

precludes

use

the

Model

1788

Battery

Pack

and

1792

BCD

Output.

Refer

Figure

2-1

and

install

the

Model

1793

follows:

WARNING

Disconnect

the

line

cord

before

removing

the

case

cover.

Turn

off

power

and

disconnect

line

cord.

Turn

the

DMM

bottom

side

and

loosen

the

four

screws

the

bottom

cover.

Hold

the

top

and

bottom

covers

together

prevent

their

separation

and

turn

the

DMM

over

the

normal

position.

Lift

off

the

top

cover

and

the

calibration

shield

installed.

Remove

the

Model

1788

Battery

Pack

Model

1792

BCD

Option

installed.

The

four

plastic

spacers

must

remain

place

the

upright

studs

projecting

through

the

main

printed

circuit

board.

NOTE

not

discard

the

calibration

shield.

This

shield

must

installed

during

calibration,

described

the

Instruction

Manual

for

your

instrument.

the

Model

1788

was

removed,

set

the

LINE/

BAT

switch

the

main

printed

circuit

board

the

LINE

position.

Set

the

Line

Voltage

Switch

(S50I)

the

1793

the

proper

voltage

(IIOV

230V).

The

1793

powered

the

line.

Discon

nect

J1003

from

its

mating

receptacle

the

instru

ment's

mother

board

(J1005

the

Model

480),

and

reconnect

P1003A

the

1793.

Connect

J1003B

the

1793

P1003

the

instrument's

mother

board

(PI005

the

Model

480).

2-1

INITIAL

PREPARATION

MODEL

1793/6423

Connect

P1008

its

mating

recepticle

the

printed

circuit

board

(J1002

the

Model

480

and

J1008

the

Models

177, 179,

179-20A).

Install

the

Model

1793

the

instrument

that

rests

the

plastic

spacers.

The

ground

clip

must

make

contact

with

the

upper

side

the

shield

the

Model

1793.

Set

the

DIP

switch,

S502,

for

the

proper

mode

operation

and

timing/address

explained

the

Operating

Instructions

(paragraph

3-3).

Install

the

top

cover

that

was

shipped

with

the

Model

1793.

This

cover

has

hole

accom

modate

the

connector

the

Model

1793.

Save

all

removed

parts

for

reinstallation

the

event

that

the

1793

removed

later

date.

2-7.

MODEL

6423

INSTALLATION.

2-8.

The

Model

6423

installed

internally

the

Model

642

Electrometer

mainframe

and

powered

its

own

line

operated

power

supply.

Installation

the

Model

6423

precludes

use

the

Model

6422

BCD

Output

and

the

Model

6428

Battery

Adapter.

Refer

Figure

2-2

and

install

the

Model

6423

follows:

WARNING

Disconnect

the

line

cord

before

removing

the

case

cover.

Turn

off

power

and

disconnect

the

line

cord.

Remove

the

four

attaching

screws

and

remove

the

top

cover.

Remove

and

replace

the

back

panel

plate

with

the

plate

that

furnished

with

the

Model

6423.

(Remove

the

Model

6422

6428

installed.)

Remove

the

front

four

attaching

screws

from

the

mother

board

and

replace

them

with

the

metal

spacers,

shown

Figure

2-2.

These

spacers

may

fit

snugly

and

require

use

wrench

install

them.

Take

care

not

cross

thread

tighten

them

too

tight.

Connect

P10G8

J1013

the

mother

board.

After

making

the

connection,

place

the

printed

cir

cuit

board

outside

the

Model

642

that

there

strain

the

cable

and

the

board

will

out

the

way

during

installation

the

shield

and

spacers

the

following

steps.

Place

the

shield

the

spacers

and

attach

with

the

four

screws,

shown.

The

printed

circuit

board

will

not

fit

properly

unless

the

shield

stalled

with

the

nut

plates

the

bottom

side

and

with

the

hole

pattern

positioned

illustrated.

Install

the

four

spacers

into

the

shield.

Place

the

printed

circuit

board

the

spacers

(component

side

down)

and

attach

with

four

screws.

Attach

the

output

connector

(J501)

the

back

panel

plate

using

two

No.

hex

head

bolts

and

two

No.

kep

nuts

(see

Component

Layout

30494D

page

Disconnect

the

power

line

the

mother

board

the

642

(J/P

1006)

and

reconnect

P1003A

the

6423.

Connect

J1003B

the

6423

P1006

the

642.

Set

the

Line

Voltage

Switch

(S501)

the

6423

the

proper

line

voltage

(llOV

230V).

Set

the

DIP

switch,

S502,

for

the

proper

mode

operation

and

timing/address

explained

the

Operating

Instructions

(paragraph

3-3).

Reinstall

the

case

top

cover.

Save

all

removed

parts

for

reinstallation

the

event

that

the

6423

removed

later

date.

2-9.

MODEL

1793/6423

OUTPUT

CONNECTOR.

2-10.

The

Model

1793/6423

uses

24-pin

connector

(J501)

which

will

interface

with

IEEE-488

1978

con

nector.

2-11.

optional

cable

accessory

available

for

interfacing

the

1793/6423

with

external

equipment.

The

Model

7008

1.8m

ft.)

IEEE

Cable.

2-2

MODEL

1793/6423

INITIAL

PREPARATION

P1003A

PLASTIC

SPACER

PLACES)

LINE

VOLTAGE

SWITCH

(S501)

P1008

GROUND

CLIP

J1008

DMM

CASE

FIGURE

2-1.

Installation

Model

1793

2-3

INITIAL

PREPARATION

MODEL

1793/6423

MODIFIED

PC-524

(30494D)

STANDOFF

(8)

SHIELD

PIOOB/

J1013

642

MAINFRAME

FIGURE

2-2.

Installation

Model

6423.

2-4

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