Fluke 732B - Page 8

732B/734A
Instruction Manual
ii
3-12. Powering the Standard from a 732B-7001 ........................................ 3-12
3-13. Replacing the Internal Battery .......................................................... 3-13
3-14. Connecting Cables to the Output .......................................................... 3-14
3-15. Connecting the GUARD and GROUND .......................................... 3-15
3-16. Monitoring Oven Temperature .............................................................. 3-16
3-17. Resetting the IN CAL Indicator ............................................................ 3-16
3-18. Monitoring The IN CAL Indicator State Remotely .............................. 3-16
3-19. Monitoring Long-Term Stability ........................................................... 3-17
3-20. Minimizing Error Sources ..................................................................... 3-18
3-21. Mechanically Induced Errors ............................................................ 3-18
3-22. Thermal EMFs .................................................................................. 3-18
3-23. Output Cable Loading ....................................................................... 3-18
4 Theory of Operation............................................................................. 4-1
4-1. Introduction ........................................................................................... 4-3
4-2. Overall Functional Description ............................................................. 4-3
4-3. Model 734A Functional Description ................................................ 4-5
4-4. Model 732B-7001 External Battery/Power Supply .......................... 4-5
4-5. 732B Circuit Description ...................................................................... 4-5
4-6. 10V Reference Circuit ...................................................................... 4-5
4-7. Generating the 1.018V Output ...................................................... 4-7
4-8. Biasing the Refamp for Low Temperature Coefficient ................ 4-7
4-9. Sense Current Cancellation .......................................................... 4-7
4-10. Buffering of the 10V Output ........................................................ 4-8
4-11. Oven Temperature Controller A4 ..................................................... 4-8
4-12. A1 Front Panel Assembly ................................................................. 4-8
4-13. Power Supplies and Battery Charger Assembly A5 ......................... 4-9
4-14. Overvoltage Protection Circuitry ................................................. 4-9
4-15. Raw DC Power Supply ................................................................. 4-11
4-16. Battery Charger ............................................................................. 4-11
4-17. +11.5V Preregulator ..................................................................... 4-11
4-18. +11.5V Low-Dropout Regulator .................................................. 4-12
4-19. -6V Power Supply ......................................................................... 4-12
4-20. IN CAL Logic ............................................................................... 4-12
4-21. LED Drive Logic .......................................................................... 4-12
4-22. AC Power to Battery Power Switching Circuitry ......................... 4-13
4-23. Battery Circuit .............................................................................. 4-13
4-24. Rear Panel Connections ................................................................ 4-13
4-25. Low-Battery Shutdown Circuitry ................................................. 4-14
5 Maintenance ......................................................................................... 5-1
5-1. Introduction ........................................................................................... 5-3
5-2. Service Information ............................................................................... 5-3
5-3. Replacing the Fuse ................................................................................ 5-3
5-4. Cleaning the External Surfaces ............................................................. 5-3
5-5. Calibration ............................................................................................. 5-3
5-6. Preparing for Calibration .................................................................. 5-4
5-7. Preparing for 10V Calibration with Adjustment ............................... 5-4
5-8. Calibration with Adjustment ............................................................. 5-6
5-9. Calibration Without Adjustment ....................................................... 5-8
5-10. Access Procedures ................................................................................. 5-9
5-11. Initial Access Procedure ................................................................... 5-9
5-12. Replacing the Battery ........................................................................ 5-9
5-13. Replacing the Oven Assembly .......................................................... 5-13
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