Keithley 172 Manual de usuario

Models 172,173

Instruction Manual

Contains Operating and Servicing/Calibration

Information for Models 172,173,1722, and 1728

Publication Date: October, 1977

Keithley Instruments, Inc.

Instrument Division

Cleveland, Ohio, U.S.A.

Document Number: 28262

INSTRUCTION MANUAL

Dlgltat Multlmeter

Models 172,173

[Contalnr Operating and SafuWno/~bmtlon

In!omuNon For Moddr 172,173,1722, and 1728.1

‘1

KEITHLEY INSTRUMENTS m

INSTRUCTION MANUAL

Digital Multimeter

Models 172,

173

THIRD PRINTING, OCT. 1977, CLEVELAND, OHIO U.S.A.

DOCUMENT NO. 28262, REVISION CODE CC

INSTRUCTION MANUAL

Dlgltal hlultlmeler

Models 172,173

CONTENTS

I Section Page

CONTENTS

ILLUSTRATIONS.

......................... : : : : : : : : : : : : : : : : : : : : : : .. ii

iii

SPECIFICATIONS ............ "

I. GENERAL INFORMATION. ....... : : : : : : : : : : : : : : : : : : : : : : I-I

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

l-2. FEATURES . . . . . . . . .

l-3.

QARRANTY INFORMATION . . . : : : : : : : : : : : : :

1-4.

CHANGE NOTICE. . . . . . . . .

l-5.

OPTIONAL MODEL 1728 RECHARGEABL; ;A;T;R; PACK: : : :

l-6.

OPTIONAL MODEL 1722 DIGITAL INTERFACE. . . . . . . .

OPERATING INSTRUCTIONS ...................

3-l.

GENERAL ........................

3-2.

HOW TO SELECT POWER. .................

;I;. HOW TO SELECT FUNCTION

HOW TO SELECT RANGE. ................................ .

HOW TO MEASURE VOLTAGE ........

HOW TO MEASURE CURRENT (MODEL 172 ONLY): : : : : : : :

HOW TO MEASURE CURRENT (MODEL

173

ONLY).

HOW TO MEASURE RESISTANCE. .. .. ... : : : : : : :

FURTHER MEASUREMENT CONSIDERATIONS

;I?;. HOW TO USE MODEL 172/173 OFF-GROUND: : : : : : : : : :

3-11. HOW TO USE OPTIONAL PROBES AND SHUNTS. ........

3-12. HOW TO USE THE MODEL 1722 DIGITAL INTERFACE. .....

ACCESSORIES ....................

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

POWER OPTIONS. ....................

ISOLATED DIGITAL OUTPUT. ........

4-4.

RACK MOUNTING. ............. : : : : : : :

4-5.

PROBE AND SHUNTS ...................

4-6.

CABLES AND CONNECTORS. ................

4-7.

MISCELLANEOUS. ....................

THEORY OF OPERATION. ....................

5-l. GENERAL ........................

INPUT SIGNAL CONDITIONING. ..............

POWER SUPPLY, SCHEMATIC NO. 28067D ..........

DISPLAY BOARD PC-403 SCHEMATIC NO. 274780. ......

CURRENT BOARD, SCHEMATIC NO. 27478D. .........

MODEL 1728 RECHARGEABLE BATTERY PACK .........

ANALOG-TO-DIGITAL CONVERTER. .............

MODEL 1722 DIGITAL INTERFACE ....

5-9. DETAILED II-WIRE OHMS OPERATION ... : : : : : : : : :

. .

. . .

. .

. . .

. .

* .

. .

. *

. .

. I-l

. l-1

l-l

. l-l

1-I

. 1-l

. 2-l

2-l

. . . . 3-l

. . . , 3-l

. . . 3-l

. . 3-2

. . . 3-3

. . 3-4

. . . . 3-5

. . . . 3-6

. . . . 3-7

. . . . 3-8

. . . 3-11

. . . . 3-12

. . 3-13

. . . . 4-l

. * . . 4- 1

. . . . 4-l

. * . . 4-l

* . . . 4-4

. . . . 4-5

. . . . 5-l

. . . . 5-1

. . . . 5-2

. . . . 5-9

. . . . 5-10

. . . . 5-12

. . . . S-13

. . . . 5-13

. . . . 5-22

. . . . 5-26

ii AA

I INSTRUCTION MANUAL

Digllel Mulllmeter

Model8 172. 173

I CONTENTS (continued)

/section >_I Page

MAINTENANCE. ................

6-1.

GENERAL. ...............

6-2. : : : : : : : : : : : : : : : : :

REQUIRED TEST EQUIPMENT. ........................

6-3.

PERFORMANCE VERIFICATION

6-4. ADJUSTMENT/CALIBRATION PR&D;R; : : : : : : : : : : : : : : : : : : : :

6-5. TROUBLESHOOTING AND REPAIR , .

7. REPLACEABLE PARTS. . . . . . . . . . : : : : : : : : : : : : : : : : : : : : :

7-1.

GENERAL. . .

7-2. ORDERING INFORMATiON : : : : : : : : : : : : : : : : : : : : : : : : : :

J-3.

SCHEMATICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

ILLUSTRATIONS

n b

6-1

6-I

6-3

6-15 /

6-19,

J-1 1

;:; j

J-1 )

TitleFi ure No.g Page

I Dimensional Data. .......................... iv

: Tilt Bail Positions ......................... vi

Front Panel ............................. t-2

Bottom View Showing Line Cord .................... l-3

2 Rear Panel Showing Current Fuse and Check Points. .......... 2-2

Model

1728

Rechargeable Battery Pack. ................ 2-4

z Installation of Battery Pack. .................... 2-5

Front Panel Pushbutton Selection. .................. 3-3

9 Typical Model

172

Current Display .................. 3-5

IO Typical Model

I73

Current Display .................. 3-6

II Typical 2 WIRE Resistance Measurement ................

3-J

12 Typical 4 WIRE Resistance Measurement ................ 3-9

Semiconductor Diode and Transistor Testing. ............. 3-10

I4 Illustration of Floating Operation. ................. 3-11

I5 Model

1722

Digital Output Interface ................. 3-14

16 Installation of Model

1722. .....................

3-15

Connector Pin Identification. .................... 3-17

18 Card-Edge Connectors. ........................ 3-17

19 Location of Jumpers and Pull-Ups on Model

1722. ........... 3-18

Model 1010 Single Rack Mounting Kit. ..............

.4-Z

21 Model

1017

Dual Rack Mounting Kit. ............... : :

.4-4

Overall Block Diagram of Model

lJ2/173

............. : .

DC Volts Input Circuit

.5-l

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

.5-4

Simplified AC Attenuator Circuit ....... 1 : ‘.‘.‘: : : : : : :

.5-6

AC Converter Circuit ............ .

.5-6

Digital Display Multiplex Scheme .................. .5-II

Basic Functional Blocks of A/D Converter ..............

.5-14

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

Basic Charge-Balance Converter .5-15

Operating Waveforms of A/D Converter ................ .5-16

Simplified Schematic of A/D Converter. ............... .5-18

;: Detailed Schematic of A/D Converter. ................ .5-20

A/D Converter System Timing. .................... .5-21

;:a. Model

1722

Block Diagram ...................... .5-24

Simplified Ohms Diagram (Shown in Z-WIRE Configuration). ...... .5-25

34b. Four-Wire Ohms Measuring Technique ................. .5-25

INSTRUCTION MANUAL

Digltal

Multimeter

Models 172, 173

12.75

(324)

DIMENSIONS IN INCHES (MM)

FIGURE 1. Dimensional Data.

INSTRUCTION MANUAL

Digllal Multimeter

Model, 172, 173

SPECIFICATIONS

INSTRUCTION MANUAL

Digital Mullimeler

Models 172.173

LEVEL POSITION - TILTBAIL AT FRONT

HANGING POSITIOI;

SHELF POSITION

45' POSITION LEVEL POSITION - TILTBAIL AT REAR

FIGURE 2. Tilt Bail Positions.

INSTRUCTION MANUAL

Digital Multimeter

Models 172. 173

GENERAL INFORMATION

SECTION I. GENERAL INFORMATION

l-l. INTRODUCTION. The Models

172

and

173

Digital Multimeters are wide-range, general-

purpose measuring instruments, capable of measuring ac/dc voltage, ac/dc current, and

resistance.

l-2. FEATURES

a. Automatic Ranging and Polarity

b. Manual Range Selection and Range Hold

C. HI and LO Otxns Capability

d. Line Operation

e. Optional Battery Operation, Model

1728.

f. Floating Capability to ?lbOOV peak

9. Optional Isolated Digital Interface, Model

1722

l-3.

WARRANTY INFORMATION. The warranty is stated on the inside front cover of the

manual. If there is a need for service, contact your Keithley representative or author-

ized repair facility as given in OUT catalog.

l-4.

CHANGE NOTICE. Improvements or changes to the instrument not incorporated into the

manual will be explained on a change notice sheet attached to the inside back cover of

the manual.

l-5. OPTIONAL MODEL

1728

RECHARGEABLE BATTERY PACK. The Model

1728

is an accessory

batterY pack which enables either line or battery operation. The Model 1728 has built-

in recharging circuitry. The Model 1728 is field-installed on the Model 172/173 chasis.

l-6. OPTIONAL MODEL

1722

DIGITAL INTERFACE. The model 1722 is a field-installable

~~~~digital output option. It provides isolated open-collector BCD outputs and control lines.

The A

IMPORTANT

symbol can be found in various places in this Instruction Manual. Carefully

read the associated

CAUTION

statements with regard to proper use and handling of the

instrument. Damage to the instrument may occur if these precautions are ignored.

The t symbol can be found in various places in this Instruction Manual. This symbol

indicates those areas on the instrument which are potential shock hazards. Carefully

read the associated WARNING statements with regard to proper use and handling of the

instrument. Serious personal injury may result if these precautions are ignored.

l-l

GENERAL INFORMATION INSTRUCTION MANUAL

Digital Multimeter

Models 172.173

FUNCTION AND UNITS DISPLAY (my)

INPUT HI AND LO, UPPER PAlR

(OHMS SOURCE. LOWER PAIR)

VOLTAGE FUNCTION (OUT)

AHPERES FUNCTION (IN)

DC FUNCTION

AUTORANG, NG (OUT)

MANUAL RANGING (IN)

LINE POWER

(LINE AND EAT MUST BE OUT FOR BATTERY CHARGE)

FIGURE 3. Model 173 Front Panel

l-2

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