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Model 2500 Dual Photodiode Meter

Service Manual

Cleveland, Ohio, U.S.A.

First Printing, August 2000

Document Number: 2500-902-01 Rev. A

Main Page

Table of Contents8
Performance Verification16
Introduction17
Verification Test Requirements17
Environmental Conditions17
Warm-Up Period18
Line Power18
Recommended Test Equipment19
Verification Limits19
Example Limits Calculation20
Restoring Factory Defaults20
Performing the Verification Test Procedures21
Test Summary21
Test Considerations21
Current Measurement Accuracy21
Voltage Bias Accuracy25
Calibration28
Introduction29
Environmental Conditions29
Temperature and Relative Humidity29
Warm-Up Period29
Line Power29
Calibration Considerations30
Calibration Cycle30
Recommended Calibration Equipment30
Calibration Menu31
Unlocking Calibration32
Unlocking Calibration from the Front Panel32
Unlocking Calibration by Remote33
Changing the Password33
Changing the Password from the Front Panel33
Changing the Password by Remote33
Resetting the Calibration Password34
Viewing Calibration Dates and Calibration Count34
Calibration Errors35
Front Panel Error Reporting35
Remote Error Reporting35
Aborting Calibration Steps35
Front Panel Calibration35
Remote Calibration46
Remote Calibration Command Summary46
Remote Calibration Procedure47
Routine Maintenance56
Line Voltage Selection57
Line Fuse Replacement57
Troubleshooting60
Introduction61
Safety Considerations61
Repair Considerations61
Power-On Self Test62
Front Panel Tests62
KEYS Test62
DISPLAY PATTERNS Test62
CHAR SET Test63
Principles of Operation63
Overall Block Diagram64
Analog Circuits65
Power Supply67
Digital Circuitry68
Troubleshooting69
Display Board Checks69
Power Supply Checks70
Digital Circuitry Checks71
Analog Circuitry Checks72
No Comm Link Error73
Disassembly74
Introduction75
Handling and Cleaning75
Handling PC Boards75
Solder Repairs75
Static Sensitive Devices76
Assembly Drawings76
Case Cover Removal77
Input Board Removal77
Mother Board Removal78
Front Panel Disassembly79
Removing Power Components79
Power Supply Module Removal79
Power Module Removal79
Power Transformer Removal80
Replaceable Parts82
Parts Lists83
Ordering Information83
Factory Service83
Component Layouts84
Accuracy Calculations97
Measurement Accuracy97
Voltage Bias Accuracy97
Calibration Reference98
Introduction99
Command Summary99
Miscellaneous Commands100
Current Measurement Commands103
Voltage Bias Commands104
Detecting Calibration Errors105
Reading the Error Queue105
Error Summary105
Status Byte EAV (Error Available) Bit106
Generating an SRQ on Error106
Detecting Calibration Step Completion106
Using the *OPC? Query106
Using the *OPC Command107
Generating an SRQ on Calibration Complete107
Calibration Program108
Introduction109
Computer Hardware Requirements109
Software Requirements109
Calibration Equipment109
General Program Instructions110
Program C-1 Model 2500 Calibration Program111

Keithley 2500 - Page 4

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