Service manual

5
TABLE OF CONTENTS
Introduction ............................................................................................................................................................................ 9
Scope .................................................................................................................................................................................... 9
Calibration and Verification ............................................................................................................................................. 9
Troubleshooting................................................................................................................................................................ 9
Principles of Operation ..................................................................................................................................................... 9
Replaceable Parts.............................................................................................................................................................. 9
Circuit Diagrams............................................................................................................................................................... 9
Safety Considerations ........................................................................................................................................................... 9
Manual Revisions................................................................................................................................................................ 10
Firmware Revisions ............................................................................................................................................................ 10
Calibration and Verification................................................................................................................................................ 11
Introduction......................................................................................................................................................................... 11
Test Equipment Required ................................................................................................................................................... 11
Operation Verification Tests............................................................................................................................................... 11
Calibration Procedure ......................................................................................................................................................... 11
Initial Setup..................................................................................................................................................................... 14
Voltage Monitor Zero Calibration .................................................................................................................................. 15
Common Mode Calibration ............................................................................................................................................ 15
Remote Readback Zero Calibration................................................................................................................................ 16
Constant Voltage Full Scale Calibration......................................................................................................................... 16
Voltage Monitor and Remote Readback Full Scale Calibration ..................................................................................... 17
Constant Voltage Zero Calibration ................................................................................................................................. 17
Current Monitor Zero Calibration................................................................................................................................... 17
Constant Current Zero Calibration.................................................................................................................................. 18
Current Monitor Full Scale Calibration .......................................................................................................................... 18
Constant Current Full Scale Calibration ......................................................................................................................... 19
Power Limit Calibration.................................................................................................................................................. 19
Resistance Programming Full Scale Calibration............................................................................................................. 19
Performance Tests............................................................................................................................................................... 20
Measurement Techniques ............................................................................................................................................... 20
Constant Voltage (CV) Tests .......................................................................................................................................... 21
Constant Current (CC) Tests........................................................................................................................................... 26
Initialization Procedure....................................................................................................................................................... 28
Troubleshooting .................................................................................................................................................................... 29
Introduction......................................................................................................................................................................... 29
Initial Troubleshooting Procedures..................................................................................................................................... 29
Electrostatic Protection....................................................................................................................................................... 30
Repair and Replacement ..................................................................................................................................................... 30
A2 Control Board Removal ............................................................................................................................................ 31
A4 FET Board Removal ................................................................................................................................................. 31
A8 GPIB Board Removal ............................................................................................................................................... 32
A3 Front-Panel Board Removal...................................................................................................................................... 32
A1 Main Board Removal................................................................................................................................................ 32
Overall Troubleshooting Procedure.................................................................................................................................... 33
GPIB Section Troubleshooting........................................................................................................................................... 33
Primary Interface Troubleshooting ..................................................................................................................................... 36
Secondary Interface Troubleshooting ................................................................................................................................. 38
Voltage and Current DAC............................................................................................................................................... 38
Readback DAC Circuits.................................................................................................................................................. 39
Readback Multiplexer (U20): ......................................................................................................................................... 39