Introduction and Specifications

Electronics Repair Manuals

Schematic Diagrams and Service Manuals

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Contents Page

1-1. Introduction 1-3

1-2. Organization of the Service Manual 1-3

1-3. Conventions 1-4

1-4. Specifications 1-4

Introduction and Specifications


1-1. Introduction

This manual presents service information for the Fluke 77 Series III Multimeter. The manual includes a theory of operation, general maintenance procedures, performance tests, calibration procedures, troubleshooting information, a list of replaceable parts, and schematic diagrams.

A meter under warranty will be promptly repaired or replaced (at Fluke's option) and returned at no charge. See the registration card for warranty terms. To locate an authorized service center, visit us on the World Wide Web: or call using any of the phone numbers listed below:

Canada: 1-800-36-FLUKE (1-800-363-5853)

Europe: +31 402-678-200

Japan: +81-3-3434-0181

Singapore: +65-738-5655

Anywhere in the world: +1-425-446-5500

1-2. Organization of the Service Manual

The following descriptions briefly describe each chapter in the manual. Chapter 1 Introduction and Specifications

This chapter describes use of the Service Manual and application of special terminology (conventions) to describe the meter's circuitry. A complete set of specifications appears at the end of this chapter.

Chapter 2 Theory of Operation

This chapter first categorizes instrument circuitry into functional blocks, with a description of each block's role in overall operation. A detailed circuit description is then given for each block. These descriptions explore operation to the component level and fully support troubleshooting and repair procedures defined in Section 3.

Chapter 3 Maintenance

Provides complete maintenance information, from general maintenance and cleaning instructions to detailed troubleshooting and repair procedures to the component level. Troubleshooting and repair procedures rely heavily on both the Theory of Operation presented in Chapter 2 and the Schematic Diagrams shown in Section 5.

Chapter 4 List of Replaceable Parts

Includes parts lists for all standard assemblies. Information on how and where to order parts is also provided.

Chapter 5 Schematic Diagrams Includes schematic for the A1 Main PCA.

1-3. Conventions

Through the manual, certain notational conventions are used. A summary of these conventions follow:

• Instrument Reference

The Fluke 77 Series III Multimeter is also referred to throughout this manual as "the meter".

• Printed Circuit Assembly

The term "pca" is used to represent a printed wiring board and its attached parts.

• Circuit Nodes

Individual pins or connections on a component are specified by a dash (-) following the component reference designator. For example, pin 19 of U30 would be U30-19.

• User Notation

Generally, push buttons, function positions, input terminals, and display notation are presented in this manual as they are seen on the meter.

Special terms (mnemonics) used in text descriptions of meter circuitry correspond to terms used on the schematic diagrams in Chapter 5.

1-4. Specifications

Specifications for the meters are presented in Table 1-1.

Introduction and Specifications


Table 1-1. Specifications

Maximum Voltage Between any Terminal and Earth Ground Display

Response Time of Digital Display

Operating Temperature Storage Temperature Temperature Coefficient

Electromagnetic Compatibility In RF field of 3 V/m on all functions. Relative Humidity except 32 MW range

32 MW range only


Battery Type

Battery Life

Continuity Beeper Shock, Vibration

Weight Safety

EMC Regulations Certifications/Listings

Rated voltage

Digital: 3,200 counts, updates 2.5/sec Analog: 31 segments, updates 25/sec

W < 1s to 320 kW, < 2s to 3.2 MW, < 10 s to 32 MW 0°C to 50°C -40°C to 60°C

0.1 x (specified accuracy)/°C (<18°C or >28°C)

Total accuracy = Specified accuracy + 0.1% of range.

0% to 90% (0°C to 35°C) 0% to 70% (35°C to 50°C) 0% to 80% (0°C to 35°C) 0% to 70% (35°C to 50°C) Operating: 2000 meters Storage: 12,000 meters 9 V NEDA 1604 or 6F22 or 006P, or NEDA 1604A or 6LR61 2000 hrs typical with alkaline 1600 hrs typical with carbon zinc 4096 Hz per MIL-T-PRF 28800F Class III, Sinusoidal, Non Operating

3.7 cm x 8.9 - 7.8 cm x 19 cm (1.5 in x 3.5 - 3.1 in x 7.49 in) 365 g (12.9 oz)

600 V CAT III and 1000 V CAT II per ANSI/ISA S82.01-1994, EN 61010-1: 1993, CSA C22.2 No 1010.1-92, UL 3111-1. EN 61326-1 1997.

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