Fluke 45 - Schematic Diagrams; A1 Main PCA

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9-3

Schematic Diagrams

45-1001

(Sheet 1 of 3)

qb45sc.tif

Figure 9-1. A1 Main PCA (cont)

Main Page

Table of Contents3
List of Tables9
List of Figures11
Introduction and Specifications15
Introduction15
Operating Instructions15
Options and Accessories15
Organization of the Service Manual16
Conventions17
Specifications18
Theory of Operation29
Introduction31
Functional Block Description31
Power Supply31
Analog Measurement Processor31
Input Protection Circuit31
Input Signal Conditioning31
Analog-To-Digital (A/D) Converter31
Serial Communication (Guard Crossing)31
Overall Functional Block Diagram32
Digital Kernel33
Display Assembly33
IEEE-488 Interface Option (-05)33
Battery Pack Option (-01)33
Detailed Circuit Description33
Power Supply Circuit Description33
Raw DC Supply34
5-Volt Switching Supply34
Inverter35
Analog Measurement Processor35
Analog Simplified Schematic Diagram36
Input Protection38
Input Signal Conditioning38
Relays39
DC Volts40
Ohms40
DC Volts 300 V Range Simplified Schematic40
Ohms Simplified Schematic41
AC Volts42
AC Buffer Simplified Schematic42
Dcma43
Acma43
Amps43
Diode/Continuity Test43
Frequency43
Active Filter44
DC Ma and Amps Simplified Schematic44
A/D Converter45
Active Filter Simplified Schematic45
Serial Communication (Guard Crossing)46
Digital Kernel46
A/D Converter Simplified Schematic46
Interface47
Microprocessor47
Eerom47
Ram48
Rom48
IEEE-488 Option Connections48
Display Assembly48
Main Assembly Connector48
Front Panel Switches48
Display49
Beeper Drive Circuit49
Watchdog Timer and Reset Circuit49
Display Controller with FIP50
Command Byte Transfer Waveforms51
Grid-Anode Timing Relationships52
General Maintenance55
Introduction57
Warranty Repairs and Shipping Information57
General Maintenance Information57
Required Equipment57
Power Requirements57
Static Safe Handling57
Cleaning58
Fuse Test and Replacement58
Line Fuse58
Current Input Fuses58
Testing Current Input Fuses58
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 Procedures61
Remove the Meter Case61
Remove Handle and Mounting Brackets61
Removing the Case61
Remove the Front Panel Assembly62
Remove the Display PCA62
Removing the Handle and Handle Mounting Brackets62
Remove the IEEE-488 Option63
Remove the Main PCA63
Remove the Analog Measurement Processor Shields63
Remove the Rms PCA64
Remove the Battery Option64
Disconnect Miscellaneous Chassis Components64
Assembly Procedures64
Install Miscellaneous Chassis Components64
Install the Battery Option65
Install the Rms PCA65
Install the Analog Measurement Processor Shields65
Install the Main PCA65
Install the IEEE-488 Option66
Assemble the Front Panel Assembly66
Assembly Details67
Install the Front Panel Assembly69
Install the Handle and Mounting Brackets69
Install the Meter Case69
Performance Testing and Calibration71
Introduction73
Required Equipment73
Performance Tests74
Front Panel Calibration77
Introduction77
Entering Calibration Mode78
Exiting Calibration Mode79
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 Procedure83
Editing the Prompt for Different Calibration Points84
C2 Location84
Calibration Using the Computer Interface85
Setup85
Interface85
IEEE-488 Interface86
The Calibration Procedure88
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 Interface90
Alternate Ohms Calibration (Computer Interface)90
Diagnostic Testing and Troubleshooting93
Introduction95
Servicing Surface-Mount Assemblies95
Error Codes96
Test Point Locator99
General Troubleshooting Procedures102
Power Supply Troubleshooting102
Raw DC Supply102
5-Volt Switching Supply103
Inverter104
Volt Switching Supply104
Analog Troubleshooting105
Uart Test105
DC Volts Troubleshooting106
AC Volts Troubleshooting106
Ohms Troubleshooting106
Digital Troubleshooting107
Main Processor Timing108
Display Assembly Troubleshooting109
Display Controller to Microprocessor Signals109
Calibration Failures111
Introduction111
Calibration-Related Components112
Calibration Interrelationships113
Retrieving Calibration Constants113
Replacing the EEROM A1U5113
List of Replaceable Parts117
Introduction119
How to Obtain Parts119
How to Contact Fluke120
Manual Status Information120
Newer Instruments120
Parts120
Final Assembly122
Option -01 Battery Pack131
Introduction133
Specifications133
Theory of Operation133
Functional Block Description133
Battery Pack Option Functional Block Diagram134
Switching Power Supply135
Cycle/Float Charge Rate Switch135
Low Battery Indicator Detector135
Low Battery Disconnect135
Constant Voltage Trickle Charger136
Other Circuits136
General Maintenance136
Removal136
Installation137
Installing the Battery Kit138
Performance Testing139
General Operability139
Battery Pack Option Connecting Cable139
Low Battery Indicator Detector and Low Battery Disconnect Test140
Cycle/Float Charge Rate Switch Test140
Calibration142
Troubleshooting143
Unplugging the Battery Pack Connectors143
Additional Tests144
Schematic Diagram144
List of Replaceable Parts144
Test Points and Adjustments144
A4 Battery Pack PCA147
Option -05 IEEE-488 Interface149
Introduction151
Theory of Operation151
Functional Block Description151
Detailed Circuit Description151
Main Assembly Connectors151
Address Decoding Circuit151
Isolation Circuits152
IEEE-488 Controller152
IEEE-488 Transceivers/Connector153
IEEE-488 Interface Connector155
General Maintenance156
Removing the IEEE-488 Interface Option156
IEEE-488 Module Assembly156
Installing the IEEE-488 Interface Option157
Performance Testing157
Troubleshooting158
Power-Up Problems158
Communication Problems158
Failure to Select IEEE-488 Interface Option158
IEEE-488 Interface Performance Test158
Failure to Handshake on IEEE-488 Bus159
Failure to Enter Remote159
Failure to Receive Multiple Character Commands160
Failure to Transmit Query Responses160
Failure to Generate an End or Identify (EOI)160
Failure to Generate a Service Request (SRQ)160
Schematic Diagram160
List of Replaceable Parts160
A5 IEEE-488 Interface PCA162
Figure Title Page165
A1 Main PCA166
Schematic Diagrams167
A1 Main PCA167
A1 Main PCA168
A2 Display PCA172
Primary Display173
Secondary Display173
A2 Display PCA173
A1A1 True Rms PCA174
A1A1 True Rms PCA175
A4 Battery PCA176
A5 IEEE-488 Interface PCA179

Fluke 45 - Schematic Diagrams; A1 Main PCA

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