Fluke Series II Manuale utente

For the benefit and convenience of its customers, Fluke

Corporation (Fluke) has reproduced this copy of amanual

which is no longer in production. This manual has not been

edited or updated since the revision date shown on the lower

left hand corner of the first page. Fluke will not be liable for

any claims, losses or damages of any kind incurred by any

user arising from use of this manual.

FLUKE

77/75/73/70/23/2

Series II Multimeter

Service Manual

PN 896204

July 1991 Rev. 1, 9/92

OPERATOR SAFETY INFORMATION

This meter has been designed and tested according to IEC Publication 348. Follow all safety

and operating instructions to ensure that the meter is used safely and is kept in good

operating condition.

•Never use the meter if the meter or test leads look damaged.

•Always turn off power to the circuit before cutting, unsoldering, or breaking the circuit. Small

amounts of current can be dangerous.

•Never measure resistance in acircuit when power is applied to the circuit.

•Never touch the probes to avoltage source when the test leads are plugged into the 10A or

300 mA input jack.

•To avoid damage or injury, never use the meter on unprotected circuits that exceed 4800

volt-amps.

•Never apply more than 1000V dc or 750V ac rms (sine) between any input jack and earth

ground.

•Always be careful when working with voltages above 60V dc or 30V ac rms. Such voltages

pose a shock hazard.

•Always keep your fingers behind the finger guards on the probe when making

measurements.

•Always use a high voltage probe to measure voltage if the peak voltage might exceed

1000V.

SYMBOLS MARKED ON EQUIPMENT

DANGER -High voltage.

Attention -refer to the manual. This symbol indicates that information about

usage of afeature is contained in the manual.

Fuse information.

USE THE PROPER FUSE

To avoid fire hazard, use only afuse identical in type, voltage rating, and current rating as

specified on the case bottom fuse rating label.

DO NOT OPERATE DISASSEMBLED METER

Always operate the meter with case top and bottom properly assembled.

Access procedures and the warnings for such procedures are contained in this Service

Manual. Service procedures are for qualified service personnel only.

DO NOT ATTEMPT TO OPERATE IF PROTECTION MAY BE IMPAIRED

If the meter appears damaged or operates abnormally, protection may be impaired.

Do not attempt to operate it. When in doubt, have the meter serviced.

Table of Contents

SECTION TITLE PAGE

1Introduction and Specifications 1-1

1-1. INTRODUCTION 1-3

1-2. ORGANIZATION OF THE SERVICE MANUAL 1-3

1-3. CONVENTIONS 1-4

4. SPECIFICATIONS 1-4

2Theory of Operation 2-1

1. INTRODUCTION 2-3

2-2. FUNCTIONAL BLOCK DESCRIPTION 2-3

2-3. DETAILED DESCRIPTION 2-3

2-4. Voltage Signal Conditioning 2-3

2-5. Cunrent Conditioning 2-4

2-6. Ohms 2-4

2-7. Additional Circuitry 2-4

2-8. AC CONVERTER 2-4

2-9. ACTIVE FILTER 2-4

2-10. ROTARY SWITCH 2-5

11. A/D CONVERSION 2-5

3Maintenance 3-1

1. INTRODUCTION 3-3

3-2. PCAACCESS AND GENERAL MAINTENANCE 3-3

3-3. DISPLAY ACCESS 3-4

3-4. CLEANING 3-4

3-5. PERFORMANCE TESTS 3-6

3-6. Initial Procedure 3-6

3-7. Display Test 3-6

3-8. DC Voltage Test 3-6

3-9. AC Voltage Test 3-7

3-10. Resistance Test 3-8

3-11. Diode Test 3-8

3-12. DC mA Test (75/21 &77/23 Only) 3-9

3-13. DC Amps Test (73, 75/21, and 77/23 Only) 3-9

3-14. CALIBRATION 3-9

3-15. TROUBLESHOOTING 3-9

3-16. Supplemental Troubleshooting Procedures 3-11

Table of Contents

SECTION TITLE PAGE

3-17. CHECKING THE CRYSTAL OSCILLATOR 3-11

3-18. CHECKING THE REFERENCE VOLTAGE 3-11

3-19. CHECKING DISPLAY DRIVE VOLTAGE 3-11

3-20. CHECKING BEEPER DRIVE SIGNAL 3-11

21. TRACING THE VDC SIGNAL PATH 3-11

4List of Replaceable Parts 4-1

1. INTRODUCTION 4-3

4-2. HOW TO OBTAIN PARTS 4-3

4-3. TECHNICAL SERVICE CENTERS 4-3

5Schematic Diagrams 5-1

List of Tables

TABLE TITLE PAGE

1. Specifications 1-5

1. SI Function Codes 2-6

1. Recommended Test Equipment 3-4

3-2. DC Voltage Test 3-7

3-3. AC Voltage Test 3-7

3-4. Resistance Test 3-8

3-5. DC mA Test 3-9

3-6. DC Amps Test 3-9

5-1. Abbreviations 5-2

List of Tables

List of Illustrations

FIGURE TITLE PAGE

2-1. Overview 2-3

2-2. Ohms Function 2-5

3. AC and A/D Converter 2-7

1. Assembly Details 3-5

3-2. Display 3-6

3-3. Troubleshooting Tree 3-10

5-1. A1 Main PCA 5-3

5-2. Signal Flow Diagram 5-5

List of illustrations

Section 1

Introduction and Specifications

CONTENTS PAGE

1-1. INTRODUCTION 1-3

1-2. ORGANIZATION OF THE SERVICE MANUAL 1-3

1-3. CONVENTIONS 14

14. SPECIFICATIONS 14

1-1

Introduction and Specifications

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