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Fluke 45 Service Manual
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45
Service M
anual
vi
7
9
Table of Contents
Table of Contents
3
List of Tables
9
List of Figures
11
Introduction and Specifications
15
Introduction
15
Operating Instructions
15
Options and Accessories
15
Organization of the Service Manual
16
Conventions
17
Specifications
18
Theory of Operation
29
Introduction
31
Functional Block Description
31
Power Supply
31
Analog Measurement Processor
31
Input Protection Circuit
31
Input Signal Conditioning
31
Analog-To-Digital (A/D) Converter
31
Serial Communication (Guard Crossing)
31
Overall Functional Block Diagram
32
Digital Kernel
33
Display Assembly
33
IEEE-488 Interface Option (-05)
33
Battery Pack Option (-01)
33
Detailed Circuit Description
33
Power Supply Circuit Description
33
Raw DC Supply
34
5-Volt Switching Supply
34
Inverter
35
Analog Measurement Processor
35
Analog Simplified Schematic Diagram
36
Input Protection
38
Input Signal Conditioning
38
Relays
39
DC Volts
40
Ohms
40
DC Volts 300 V Range Simplified Schematic
40
Ohms Simplified Schematic
41
AC Volts
42
AC Buffer Simplified Schematic
42
Dcma
43
Acma
43
Amps
43
Diode/Continuity Test
43
Frequency
43
Active Filter
44
DC Ma and Amps Simplified Schematic
44
A/D Converter
45
Active Filter Simplified Schematic
45
Serial Communication (Guard Crossing)
46
Digital Kernel
46
A/D Converter Simplified Schematic
46
Interface
47
Microprocessor
47
Eerom
47
Ram
48
Rom
48
IEEE-488 Option Connections
48
Display Assembly
48
Main Assembly Connector
48
Front Panel Switches
48
Display
49
Beeper Drive Circuit
49
Watchdog Timer and Reset Circuit
49
Display Controller with FIP
50
Command Byte Transfer Waveforms
51
Grid-Anode Timing Relationships
52
General Maintenance
55
Introduction
57
Warranty Repairs and Shipping Information
57
General Maintenance Information
57
Required Equipment
57
Power Requirements
57
Static Safe Handling
57
Cleaning
58
Fuse Test and Replacement
58
Line Fuse
58
Current Input Fuses
58
Testing Current Input Fuses
58
Replacing the 500 Ma and 440 Ma Input Fuses (F1 and F5)
59
Replacing the Line Fuse (F3)
59
Replacing the 10 a Input Jack Fuse (F2)
60
Replacing the External 100 Ma Input Fuse (F1)
60
Disassembly Procedures
61
Remove the Meter Case
61
Remove Handle and Mounting Brackets
61
Removing the Case
61
Remove the Front Panel Assembly
62
Remove the Display PCA
62
Removing the Handle and Handle Mounting Brackets
62
Remove the IEEE-488 Option
63
Remove the Main PCA
63
Remove the Analog Measurement Processor Shields
63
Remove the Rms PCA
64
Remove the Battery Option
64
Disconnect Miscellaneous Chassis Components
64
Assembly Procedures
64
Install Miscellaneous Chassis Components
64
Install the Battery Option
65
Install the Rms PCA
65
Install the Analog Measurement Processor Shields
65
Install the Main PCA
65
Install the IEEE-488 Option
66
Assemble the Front Panel Assembly
66
Assembly Details
67
Install the Front Panel Assembly
69
Install the Handle and Mounting Brackets
69
Install the Meter Case
69
Performance Testing and Calibration
71
Introduction
73
Required Equipment
73
Performance Tests
74
Front Panel Calibration
77
Introduction
77
Entering Calibration Mode
78
Exiting Calibration Mode
79
DC Volts Calibration (Front Panel)
79
AC Volts Calibration (Front Panel)
79
DC and AC Milliamp Calibration (Front Panel)
79
DC and AC Amps Calibration (Front Panel)
81
Ohms Calibration (Front Panel)
81
Alternate Ohms Calibration (Front Panel)
83
Continuity/Hysteresis Threshold Calibration (Front Panel)
83
Frequency Calibration (Front Panel)
83
C2 Adjustment Procedure
83
Editing the Prompt for Different Calibration Points
84
C2 Location
84
Calibration Using the Computer Interface
85
Setup
85
Interface
85
IEEE-488 Interface
86
The Calibration Procedure
88
DC Volts Calibration (Computer Interface)
89
AC Volts Calibration (Computer Interface)
89
DC and AC Milliamps Calibration (Computer Interface)
89
DC and AC Amps Calibration (Computer Interface)
89
Ohms Calibration (Computer Interface)
89
Continuity/Hysteresis Threshold Calibration (Computer Interface)
90
Frequency Calibration (Computer Interface)
90
Concluding Calibration Using the Computer Interface
90
Alternate Ohms Calibration (Computer Interface)
90
Diagnostic Testing and Troubleshooting
93
Introduction
95
Servicing Surface-Mount Assemblies
95
Error Codes
96
Test Point Locator
99
General Troubleshooting Procedures
102
Power Supply Troubleshooting
102
Raw DC Supply
102
5-Volt Switching Supply
103
Inverter
104
Volt Switching Supply
104
Analog Troubleshooting
105
Uart Test
105
DC Volts Troubleshooting
106
AC Volts Troubleshooting
106
Ohms Troubleshooting
106
Digital Troubleshooting
107
Main Processor Timing
108
Display Assembly Troubleshooting
109
Display Controller to Microprocessor Signals
109
Calibration Failures
111
Introduction
111
Calibration-Related Components
112
Calibration Interrelationships
113
Retrieving Calibration Constants
113
Replacing the EEROM A1U5
113
List of Replaceable Parts
117
Introduction
119
How to Obtain Parts
119
How to Contact Fluke
120
Manual Status Information
120
Newer Instruments
120
Parts
120
Final Assembly
122
Option -01 Battery Pack
131
Introduction
133
Specifications
133
Theory of Operation
133
Functional Block Description
133
Battery Pack Option Functional Block Diagram
134
Switching Power Supply
135
Cycle/Float Charge Rate Switch
135
Low Battery Indicator Detector
135
Low Battery Disconnect
135
Constant Voltage Trickle Charger
136
Other Circuits
136
General Maintenance
136
Removal
136
Installation
137
Installing the Battery Kit
138
Performance Testing
139
General Operability
139
Battery Pack Option Connecting Cable
139
Low Battery Indicator Detector and Low Battery Disconnect Test
140
Cycle/Float Charge Rate Switch Test
140
Calibration
142
Troubleshooting
143
Unplugging the Battery Pack Connectors
143
Additional Tests
144
Schematic Diagram
144
List of Replaceable Parts
144
Test Points and Adjustments
144
A4 Battery Pack PCA
147
Option -05 IEEE-488 Interface
149
Introduction
151
Theory of Operation
151
Functional Block Description
151
Detailed Circuit Description
151
Main Assembly Connectors
151
Address Decoding Circuit
151
Isolation Circuits
152
IEEE-488 Controller
152
IEEE-488 Transceivers/Connector
153
IEEE-488 Interface Connector
155
General Maintenance
156
Removing the IEEE-488 Interface Option
156
IEEE-488 Module Assembly
156
Installing the IEEE-488 Interface Option
157
Performance Testing
157
Troubleshooting
158
Power-Up Problems
158
Communication Problems
158
Failure to Select IEEE-488 Interface Option
158
IEEE-488 Interface Performance Test
158
Failure to Handshake on IEEE-488 Bus
159
Failure to Enter Remote
159
Failure to Receive Multiple Character Commands
160
Failure to Transmit Query Responses
160
Failure to Generate an End or Identify (EOI)
160
Failure to Generate a Service Request (SRQ)
160
Schematic Diagram
160
List of Replaceable Parts
160
A5 IEEE-488 Interface PCA
162
Figure Title Page
165
A1 Main PCA
166
Schematic Diagrams
167
A1 Main PCA
167
A1 Main PCA
168
A2 Display PCA
172
Primary Display
173
Secondary Display
173
A2 Display PCA
173
A1A1 True Rms PCA
174
A1A1 True Rms PCA
175
A4 Battery PCA
176
A5 IEEE-488 Interface PCA
179
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Fluke 45 Specifications
General
Diode Test
Yes
Display Digits
5 digits
Interface
RS-232
Frequency Range
5Hz to 500kHz
Continuity
< 25 Ω
Basic DC Accuracy
0.05%
Power Supply
115/230 V AC, 50/60 Hz
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