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HYDRA
Service Manual
iv
3-22. Install Miscellaneous Chassis Components .................................... 3-13
3-23. Install the A/D Converter PCA ....................................................... 3-13
3-24. Install the Main PCA ...................................................................... 3-14
3-25. Install the IEEE-488 Option (2620A Only) .................................... 3-14
3-26. Install the Memory PCA (2625A Only) .......................................... 3-14
3-27. Install the Memory Card I/F PCA (2635A Only) ........................... 3-15
3-28. Assemble the Front Panel Assembly .............................................. 3-15
3-29. Install the Front Panel Assembly .................................................... 3-15
3-30. Install the Handle and Mounting Brackets ..................................... 3-15
3-31. Install the Instrument Case ............................................................. 3-15
4 Performance Testing and Calibration............................................... 4-1
4-1. Introduction ........................................................................................ 4-3
4-2. Required Equipment ............................................................................ 4-3
4-3. Performance Tests ............................................................................... 4-4
4-4. Accuracy Verification Test ............................................................. 4-4
4-5. Channel Integrity Test ..................................................................... 4-4
4-6. Thermocouple Measurement Range Accuracy Test ....................... 4-6
4-7 4-Terminal Resistance Test. ............................................................ 4-7
4-8. Thermocouple Temperature Accuracy Test ................................... 4-8
4-9. Open Thermocouple Response Test ............................................... 4-11
4-10. RTD Temperature Accuracy Test ................................................... 4-11
4-11. RTD Temperature Accuracy Test (Using Decade Resistance
Source) ........................................................................................ 4-11
4-12. RTD Temperature Accuracy Test (Using DIN/IEC 751) ........... 4-12
4-13. Digital Input/Output Verification Tests .......................................... 4-13
4-14. Digital Output Test ..................................................................... 4-13
4-15. Digital Input Test ........................................................................ 4-14
4-16. Totalizer Test .............................................................................. 4-14
4-17. Totalizer Sensitivity Test ............................................................ 4-15
4-18. Dedicated Alarm Output Test ......................................................... 4-16
4-19. External Trigger Input Test ............................................................. 4-18
4-20. Calibration ........................................................................................... 4-18
4-21. Using Hydra Starter Calibration Software ...................................... 4-20
4-22. Setup Procedure Using Starter .................................................... 4-20
4-23. Calibration Procedure Using Starter ........................................... 4-21
4-24. Using a Terminal ............................................................................. 4-22
4-25. Setup Procedure Using a Terminal ............................................. 4-22
4-26. Calibration Procedure Using a Terminal .................................... 4-22
4-28. Reference Junction Calibration ....................................................... 4-24
4-29. Concluding Calibration ................................................................... 4-25
4-30. Updating 2635A Data Bucket Embedded Instrument Firmware ........ 4-27
4-31. Using the PC Compatible Firmware Loader Software ................... 4-28
4-32. Setup Procedure for Firmware Download .................................. 4-29
4-33. Default Instrument Firmware Download Procedure .................. 4-29
4-34. Using LD2635 Firmware Loader Directly ................................. 4-30
5 Diagnostic Testing and Troubleshooting (2620A/2625A)................ 5-1
5-1. Introduction ........................................................................................ 5-3
5-2. Servicing Surface-Mount Assemblies ................................................. 5-3
5-3. Error Codes .......................................................................................... 5-4
5-4. General Troubleshooting Procedures .................................................. 5-6
5-5. Power Supply Troubleshooting ........................................................... 5-8
5-6. Raw DC Supply .............................................................................. 5-8