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Fluke 79 Service Manual

Ii series

Also See for 79

Instruction sheet - 12 pages

Table Of Contents

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3

Operator Safety Information

14

Specifications

Table of Contents

3
Operator Safety Information
4
Table of Contents
6
List of Tables
8
List of Figures
10
Specification: Contents
14
Specifications
18
Theory of Operation: Contents
20
Functional Block Description
20
Block Diagram
21
Circuit Descriptions
21
Input Overload Protection, Rotary Knob Switch
21
Input Signal Conditioning Circuit
21
Volts Functions
22
Ohms Functions
22
4V Range Simplified Schematic
23
Current Functions
23
400 Range Simplified Schematic
24
Analog Section of Integrated Multimeter IC (U4)
24
Continuity, Low Ohms and Diode Test Functions
25
A/D Converter
26
Microcomputer Control
26
Peripherals to U4
26
AC Buffer
26
Capacitance Measurements, Frequency Measurements
27
AC Converter
27
Active Filter
27
100-Nf Range Simplified Schematic
28
Display
28
A/D Converter, Beeper, Power Supply
28
Typical Voltage Levels and Tolerance
30
Static Awareness
32
Maintenance: Contents
34
Recommended Equipment
35
Case Disassembly
35
Battery Replacement
35
Fuse Test/Replacement
36
Assembly Details
37
Circuit Assembly Removal
37
Display Access
37
Cleaning
38
Performance Tests
38
Setup
38
Display Test
39
DC Voltage Test
39
MV DC Test
40
AC Voltage Test
40
Frequency Test
41
Ohms Test
41
Resistance Test
42
Capacitance Test
42
Continuity Test
42
Diode Test
42
DC and AC Current Test
43
Calibration
43
DC Amps Test, DC and AC Ma Test
44
Troubleshooting
44
Surface Mount Assemblies
44
Calibration Adjustment Points
45
Power Supply Related Troubleshooting
45
Functional Description of Power Supply Components
46
Common (Shunt) Regulator Troubleshooting
46
Voltage Levels
47
VDD (Series) Regulator Troubleshooting
48
List of Replaceable Parts: Contents
52
Final Assembly: Parts List
53
Final Assembly Exploded View
55
A1 Main PCA Parts List
57
A1 Main PCA Exploded View
60
Schematic Diagrams: Contents
62
A1 Main PCA Schematic Diagram

Table of Contents

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Table of Contents

3
Operator Safety Information
4
Table of Contents
6
List of Tables
8
List of Figures
10
Specification: Contents
14
Specifications
18
Theory of Operation: Contents
20
Functional Block Description
20
Block Diagram
21
Circuit Descriptions
21
Input Overload Protection, Rotary Knob Switch
21
Input Signal Conditioning Circuit
21
Volts Functions
22
Ohms Functions
22
4V Range Simplified Schematic
23
Current Functions
23
400 Range Simplified Schematic
24
Analog Section of Integrated Multimeter IC (U4)
24
Continuity, Low Ohms and Diode Test Functions
25
A/D Converter
26
Microcomputer Control
26
Peripherals to U4
26
AC Buffer
26
Capacitance Measurements, Frequency Measurements
27
AC Converter
27
Active Filter
27
100-Nf Range Simplified Schematic
28
Display
28
A/D Converter, Beeper, Power Supply
28
Typical Voltage Levels and Tolerance
30
Static Awareness
32
Maintenance: Contents
34
Recommended Equipment
35
Case Disassembly
35
Battery Replacement
35
Fuse Test/Replacement
36
Assembly Details
37
Circuit Assembly Removal
37
Display Access
37
Cleaning
38
Performance Tests
38
Setup
38
Display Test
39
DC Voltage Test
39
MV DC Test
40
AC Voltage Test
40
Frequency Test
41
Ohms Test
41
Resistance Test
42
Capacitance Test
42
Continuity Test
42
Diode Test
42
DC and AC Current Test
43
Calibration
43
DC Amps Test, DC and AC Ma Test
44
Troubleshooting
44
Surface Mount Assemblies
44
Calibration Adjustment Points
45
Power Supply Related Troubleshooting
45
Functional Description of Power Supply Components
46
Common (Shunt) Regulator Troubleshooting
46
Voltage Levels
47
VDD (Series) Regulator Troubleshooting
48
List of Replaceable Parts: Contents
52
Final Assembly: Parts List
53
Final Assembly Exploded View
55
A1 Main PCA Parts List
57
A1 Main PCA Exploded View
60
Schematic Diagrams: Contents
62
A1 Main PCA Schematic Diagram

Troubleshooting

Also See for Fluke 79

Fluke 79 Instruction Sheet

Fluke 79 Instruction Sheet 12 pages

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29