Keithley AUTO-PROBE 167 Bedienungsanleitung

INSTRUCTION

MANUAL

MODEL

167

AUTO-PROBE™

DIGITAL

MULTIMETER

ICEITHLEY

irsrSTRU]VnEIS:TS

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.

pay

domestic

surface

freight

costs.

exercise

this

warranty,

cal

your

local

field

representative

the

Cleveland

factory,

ODD

216-248-0400.

You

wil

given

assist

ance

and

shipping

instructions.

REPAIRS

AND

RECALIBRATION

Keithley

Instruments

maintains

complete

pair

service

and

standards

laboratory

Cleve

land,

and

has

authorized

field

repair

facil

ity

Los

Angeles

and

countries

outside

the

United

States

having

Keithley

field

repre

sentatives.

insure

prompt

repair

recalibration

serv

ice,

please

contact

your

local

field

representa

tive

the

plant

directly

before

returning

the

instrument.

Estimates

for

repairs,

normal

recalibrations,

and

cal

ibrations

traceable

the

National

reau

Standards

are

avai

lable

upon

request.

INSTRUCTION

MANUAL

MODEL

167

AUTO-PROBE™

DIGITAL

MULTIMETER

Keithley

Instruments,

Inc.1972

0172

CONTENTS

Title

Page

Contents

List

Illustrations

iii

Specifications

General

Information

1-1.

Introduction

1-2.

Warranty

Information

1-3.

Change

Notice

1-4.

Applications

1-5.

Accessories

Initial

Preparation

2-1.

General

2-2.

Inspection

2-3.

Preparation for

Use

Operating

Instructions

3-1.

General

3-2.

Turn-on

Procedure

3-3.

Connections

3-4.

Function

Selection

3-5.

Operation

Voltmeter

3-6.

Operation

Ohmmeter

3-7.

Operation

Ammeter

3-8.

Battery

Operation

3-9.

Line

Operation

3-10.

Auxiliary

Power

Operation

3-11.

Battery

Life

3-12.

Display

Theory

Operation

4-1.

General

4-2.

Analog

Circuitry

4-3.

Digital

Circuitry

4-4.

Voltage

Operation

4-5.

Voltage

Operation

4-6.

OHMS

Operation

4-7.

Power

Supply

Maintenance

5-1.

General

5-2.

Required

Test

Equipment.

...

5-3.

Performance

Checks

5-4.

Adjustment

and

Calibration

Procedure

5-5.

Troubleshooting

5-6.

Battery

Test

5-7.

Battery

Replacement

5-8.

Battery

Charging

Replaceable

Parts

6-1.

General

6-2.

Ordering

Information

6-3.

Cross

Reference.

6-4.

Parts

List

6-5.

Code-to-Name

List.

Schematic

Diagrams

7-2.

Block

Diagram,

No.

25354D

7-3.

Power

System,

No.

25340D

7-4.

Analog

Circuitry,

No.

25342D

7-5.

Digital

Circuitry,

No.

25343D

Appendix

Service

Form

Change

Notice

0172

MODEL

167

ILLUSTRATIONS

Figure

No.

Title

Page

No.

Front

Panel

with

Probe

Installed

Front

Panel

with

Probe

Removed

Rear

Panel,

Auxiliary

Power

Receptacle

Operation

Voltmeter

Operation

Ohmmeter

Measurement

Diode

Resistance

Operation

an Ohmmeter

Digital

Display

Battery

Installation

Battery

Compartment

Overall

Block

Diagram

Full

Wave

Rectifier

LSI

Block

Diagram

A/D

Converter

Block

Diagram

Identification

Segments

Identification

Multiplex

Lines

Voltage

Operation

Voltage

Operation

OHMS

Operation

Top

Cover

Assembly

Chassis

Assembly

Calibration

Controls

Auxiliary

Power

Battery

Check

Test

Points

Circuit

Board

Component

Layout,

Resistors

Component

Layout,

Capacitors

Component

Layout,

Transistors

Printed

Circuit

PC-307

Case

Outlines

Case

Outlines

Case

Outlines,

Resistor

Networks

Case

Outline,

LSI-1

Probe

Assembly

0172

SPECIFICATIONS

MODEL

157

SPECIFICATIONS

AUTORANGING

VOLTMETER

RANGE:

millivolt

per

digit

+1000

volts.

ACCURACY:

+0.2%

reading

digit

INPUT

IMPEDANCE:

megohms

shtmted

approximately

220

picofarads.

NMRR:

Greater

than

above

Hz.

AUTORANGING

VOLTMETER

RANGE:

millivolt

per

digit

500

volts

rms.

ACCURACY:

200

volts;

+1%

reading

digits,

kHz,

+2%

reading

digits

kHz.

200

volts

500

volts;

+2%

reading

digits,

kHz,

+5%

reading

digits

kHz.

INPUT

IMPEDANCE:

megohms

shunted

approximately

220

picofarads.

AUTORANGING

OHMMETER

RANGE:

ohm

per

digit

megohms.

ACCURACY:

+0.3%

reading

digit

ohm.

TEST

CONDITIONS:

Current;

milliampere

0.1

microampere

depending

range.

Voltage;

volt

1000

digits,

volts

maximum

into

open

circuit.

GENERAL

READING

TIME:

Less

than

seconds

rated

accuracy.

DISPLAY:

1/2

digits,

appropriate

decimal

position,

polarity

indication

and

indication

function

(DC,

AC,

k(2,

MO)

all

probe.

Upranges

2000,

down-

ranges

at 0189.

POLARITY:

Automatic

RANGING:

Fully

automatic

each

function.

OVERLOAD

INDICATION:

Display

blinks

when

beyond

specified

maximum

range.

MAXIMUM

OVERLOAD:

1200

volts

peak

voltage

ranges.

130

volts

rms

ohms.

STABILITY:

+0.02%

reading

+0.2

digit

per

°C.

Calibrated

23°C.

ENVIRONMENT:

Operating

0°C

50°C.

70%

Relative

Humidity

35°C.

Storage

-25°C

+65°C.

POWER:

Supplied

with

Model

"D"

Cells

for

internal

mounting

(Any

type

useable)

Life

with

continuous

operation

Life

with

push-to-

read

switch*

167

Alkaline

hours

typ.

months

typ.

167/1671

icke1-Cadmium

hours

per

charge

typ.

month

per

charge

typ.

^Holding

probe

turns

ins^trument

on.

Instant

warmup

permits

final

reading

within

seconds.

**Recharging

internal

Nickel-Cadmium

batteries

and/or

line

operation

provided

power

source

included

Model

1671.

BATTERY

TEST:

Test

point

for

measuring

battery

voltage

with

instrument

itself

provides

indication

battery

condition.

CONNECTORS:

Probe

tip

and

alligator

ground

clip.

When

probe

stored

instrument,

banana

jacks.

DIMENSIONS,

WEIGHT:

Probe;

7-3/8

in.

5/8

in.

(188

15mm),

1-1/4

in.

3/4

in.

(31

18mm)

display

area,

4-1/2

ft.

(1500mm)

cable.

Electronics

Pack;

in.

high

6-3/4

in.

wide

10-1/2

in.

deep

(75

170

265iim)

net

weight

(with

Alkaline

cells)

pounds

(1,9

kg).

ACCESSORIES

FURNISHED:

Ground

lead,

attached

probe.

0172

MODEL

167

GENERAL

INFORMATION

SECTION

GENERAL

INFORMATION

I-I.

INTRODUCTION.

The

Model

167

compact,

versatile,

autoranging

digital

multimeter

useful

for

measurement

voltage,

resistance,

and

current.

The

Model

167

indicates

volts

from

500

volts,

volts

from

1000

volts,

and

resistance

from

Ifl

MSI.

Current

measurements

also

can

made

fromO.l

amperes

with

the

accessory

Model

1673

Current

Shunt.

1-2.

WARRANTY

INFORMATION.

The

warranty

given

the

inside

front

cover

the

manual.

there

need

for

service,

fill

out

the

Service

Form

sup

plied

the

back

the-manual.

1-3.

CHANCE

NOTICE.

there

are

any

improvements

changes

the

instru

ment

not

incorporated

into

the

manual

these

will

explained

yellow

Change

Notice

attached

the

inside

back

cover.

167

AUTO

PBOBl

DMIVI

FIGURE

Front

Panel

With

Probe

Installed.

0172

GENERAL

INFORMATION

1-4.

APFLICAXrONS.

MODEL167

Probe

Measurements.

The

Model

167

useful

for

electrical

measure-

ments

wherever

portable

battery-operated

instrument

needed.

Since

the

digital

display

the

probe,

measurements

can

quickly

and

easily

made

simply

moving

the

probe

from

point-to-point

such

when

servicing

elec

trical

circuits.

Bench

Measurements.

The

Model

167

also

useful

bench

operated

multimeter

with

the

probe

installed

the

front

panel.

The

front

panel

ter

minals

are

used

make

all

connections

for

normal

multimeter

operation.

1-5.

ACCESSORIES.

Model

1671

Rechargeable

Battery

Kit.

This

accessory

includes

set

six

nickel-cadmium

batteries

and

line-operated

Recharger.

The

Recharger

cable

mates

with

the

rear

panel

"AUXILIARY

POWER"

receptacle

the

Model

167.

The

Model

167

can

operated

while

the

Recharger

connected

line

power.

The

Recharger

provides

greater

than

10®

ohms

insulation

resistance

between

and

power

ground

with

500

volts

maximum

common

mode

voltage.

Model

1672

Line

Adapter.

This

accessory

converts

the

Model

167

line

operation.

The

Adapter

cable

mates

with

the

rear

panel

"AUXILIARY

POWER"

ceptacle

the

Model

167.

The

Model

167

automatically

switches

battery

power

the

line

voltage

interrupted.

The

Adapter

provides

greater

than

10®

ohms

insulation

resistance

between

and

power

ground

with

500

volts

max-

imum

common

mode

voltage.

Model

1673

Current

Shunt.

This

accessory

current

shunt

which

adds

the

Model

167

the

capability

measure

current

from

0.1

amperes.

Accuracy

the

shunt

resistors

+0.37..

The

resistors

are

switch

selected

decade

steps

from

ohm

kilohms.

Model

1674

Carrying

Case.

This

accessory

rugged

leather

carrying

case

with

adjustable

shoulder

strap

and

belt

loop.

Model

1677

Power

Cable.

This

accessory

power

cable

which

mates

with

the

rear

panel

"AUXILIARY

POWER"

receptacle.

The

foot

long

cable

permits

convenient

connections

external

power

source.

Model

1678

Rechargeable

Battery

Set.

This

accessory

set

six

nickel-cadmium

batteries

without

Recharger.

Model

1679

Alkaline

Battery

Set.

This

accessory

set

six

non-

rechargeable

alkaline

cells.

0172

MODEL

167

INITIAL

PREPARATION

SECTION

INITIAL

PREPARATION

2-1.

GENERAL.

This

section

describes

procedures

for

Incoming

Inspection

and

preparation

for

use.

2-2.

INSPECTION.

The

Model

167

was

carefully

Inspected

both

mechanically

and

electrically

before

shipment.

Upon

receiving

the

Instrument

check

for

any

obvious

damage

which

may

have

occurred

during

transit.

Report

any

damages

the

shipping

agent.

verify

the

electrical

specifications

test

the

Instru

ment

using

the

Performance

Check

procedure

Section

2-3.

PREPARATION

FOR

USE.

The

Model

167

shipped

ready-to-use

with

six

alkaline

batteries

Installed

the

battery

compartment.

The

probe

Installed

the

front

panel

with

the

cable

wrapped

around

the

base

the

chassis.

The

ground

lead

stored

the

opening

the

bottom

the

Instrument.

Battery

Operation

Using

Alkaline

Cells.

The

Model

167

useable

for

hours

continuous

operation

from

set

six

alkaline

batteries.

The

battery

condition

may

checked

any

time

using

the

probe

for

self-test.

test

the

batteries,

remove

the

probe

from

the

front

panel,

depress

the

"DCV"

pushbutton

and

"push-to-read"

switch

along

the

top

the

probe.

Touch

probe

tip

the

rear

panel

"BATTERY

TEST"

terminal

and

read

the

display.

The

read

ing

should

greater

than

volts

for

satisfactory

battery

condition.

the

Model

167

falls

turn

on,

check

for

proper

Installation

the

batteries

shown

Figure

the

voltage

too

low,

replace

with

new

batteries

explained

paragraph

3-8c.

Battery

Operation

Using

Nickel-Cadmium

Cells.

The

Model

167

can

also

powered

rechargeable

nickel-cadmium

batteries

for

hours

continuous

operation.

The

battery

condition

may

checked

any

time

using

the probe

for

self-test.

test

the

batteries,

remove

the

probe

from

the

front

panel,

press

the

"DCV"

pushbutton

and

"push-to-read"

switch

along

the

top

the

probe.

Touch

probe

tip

the

rear

panel

"BATTERY

TEST"

terminal

and

read

the

display.

The

reading

should

greater

than

volts

for

satisfactory

battery

condition.

the

Model

167

falls

turn

on,

check

for

proper

Installation

shown

Figure

the

batteries

are

Installed

properly

and

the

voltage

too

low,

connect

the

accessory

Model

1671

Recharger

described

paragraph

3-8d

and

recharge

the

batteries.

ensure

that

the

nickel-cadmium

batteries

are

fully

charged,

recharge

the

batteries

least

hours.

Since

the

Model

1671

Re-

charger

useable

line

power

adapter,

the

Model

167

can

operated

con

tinuously

even

while

recharging

the

batteries.

Line

Operation

Using

the

Model

1672.

The

Model

1672

converts

the

Model

167

line

operation

when

connected

described

paragraph

3-9.

0172

OPERATING

INSTRUCTIONS

MODEL

167

SECTION

OPERATING

INSTRUCTIONS

3-1.

GENERAL.

This

section

describes

the

procedures

for

operating

the

Model

167

voltmeter,

ohmmeter,

and

ammeter.

3-2.

TURN-ON

PROCEDURE.

When

the

probe

installed

the

front

panel

the

Model

167

can

turned

depressing

any

one

the

front

panel

push

buttons

identified

"ACV",

"DCV",

"OHMS".

When

the

probe

removed

from

the

front

panel

the

"push-to-read"

bar

along

the

top

the

probe

must

depressed

and

held

this

position

turn

the

instrument.

The

display

the

probe

lighted

whenever

the

instrument

turned

and

therefore

serves

"power

on"

indication.

When

the

"push-to-read"

bar

the

probe

released

the

instrument

will

turned

off

thereby

conserving

battery

power.

When

the probe

installed

the

front

panel

the

Model

167

will

turned

continuously

unless

the

front

panel

"OFF"

pushbutton

depressed.

3-3.

CONNECTIONS.

The

Model

167

has

two

front

panel

terminals

identified

"HI"

(red)

and

"LO"

(black).

These

terminals

mate

with

"banana"

plugs

similar

Keithley

part

no.

BC-5.

The

probe

tip

can

also

used

for

connections

"HI"

instead

the

front

panel

"HI"

terminal.

Probe

Measurements.

The

Model

167

probe

can

used

for

in-circuit

meas

urements

with

the

convenience

display

visible

right

the

point

meas

urement.

make

measurement,

remove

the

probe

from

the

front

panel,

unwind

the probe

cable,

select

the

desired

FUNCTION,

depress

the

"push-to-read"

bar,

and

use

the

probe

and

front

panel

"LO"

terminal

for

input

connections.

When

the

probe

used

for

measurements

the

front

panel

"HI"

terminal

automati

cally

disconnected.

The

accessory

ground

lead,

which

stored

the

bottom

the

instrument,

may

used

for

connection

the

"LO"

terminal.

Bench

Measurements.

The

Model

167

can

used

for

making

measurements

with

both front

panel

"HI"

and

"LO"

terminals

connected

the

input.

make

measurement,

install

the

probe

the

front

panel

and

select

the

desired

FUNCTION.

The

front

panel

"HI"

activated

only

when

the

probe

installed

the

front

panel

opening

designated

"PROBE".

The

accessory

ground

lead

may

used

for

connection

the

"LO"

terminal.

similar

lead

may

used

for

connection

the

"HI"

terminal.

Since

the

front

panel

terminal

spacing

3/4",

dual

"banana"

plug

(such

Keithley

part

BC-7

)

may

used

for

quick

connections

both

terminals.

0172

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