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5700A/5720A Series II
Service Manual
ii
1-34. General Specifications.......................................................................... 1-36
1-35. Auxiliary Amplifier Specifications...................................................... 1-37
2 Theory of Operation........................................................................... 2-1
2-1. Introduction .......................................................................................... 2-5
2-2. Calibrator Overview............................................................................. 2-5
2-3. Internal References .......................................................................... 2-5
2-4. Hybrid Reference Amplifiers ...................................................... 2-5
2-5. Fluke Thermal Sensor (FTS)....................................................... 2-5
2-6. Digital-to-Analog Converter (DAC)............................................ 2-6
2-7. Digital Section Overview..................................................................... 2-6
2-8. Analog Section Overview..................................................................... 2-6
2-9. Functional Description Presented by Output Function........................ 2-8
2-10. DC Voltage Functional Description................................................. 2-8
2-11. AC Voltage Functional Description................................................. 2-11
2-12. Wideband AC V Functional Description (Option -03).................... 2-12
2-13. DC Current Functional Description................................................. 2-12
2-14. AC Current Functional Description................................................. 2-12
2-15. Ohms Functional Description .......................................................... 2-13
2-16. System Interconnect Detailed Circuit Description............................... 2-13
2-17. Digital Motherboard Assembly (A4)............................................... 2-13
2-18. Transformer Assembly (A22).......................................................... 2-14
2-19. Analog Motherboard Assembly (A3) .............................................. 2-14
2-20. Front/Rear Binding Posts................................................................. 2-18
2-21. Rear Panel Assembly (A21)............................................................. 2-18
2-22. Filter PA Supply Assembly (A18)................................................... 2-18
2-23. Digital Section Detailed Circuit Description ....................................... 2-18
2-24. Digital Power Supply Assembly (A19)............................................ 2-18
2-25. +5V Power Supply....................................................................... 2-19
2-26. ±12V Power Supplies.................................................................. 2-19
2-27. +35V Power Supply..................................................................... 2-19
2-28. +75V Power Supply..................................................................... 2-20
2-29. +35V and +75V Shut-Down Circuit............................................ 2-20
2-30. CPU (Central Processing Unit) Assembly (A20) ............................ 2-21
2-31. Power-Up and Reset Circuit........................................................ 2-21
2-32. Clock Generation......................................................................... 2-21
2-33. Watchdog Timer.......................................................................... 2-24
2-34. Address Decoding and DTACK (Data Acknowledge)................ 2-24
2-35. Interrupt Controller...................................................................... 2-25
2-36. Glue Logic ................................................................................... 2-25
2-37. RAM (Random-Access Memory)................................................ 2-25
2-38. ROM (Read-Only Memory) ........................................................ 2-25
2-39. Electrically-Erasable Programmable Read-Only Memory
(EEPROM) .................................................................................. 2-26
2-40. DUART (Dual Universal Asynchronous Receiver/transmitter)
Circuit .......................................................................................... 2-26
2-41. Clock/Calendar Circuit................................................................ 2-26
2-42. Clock Filter Circuit...................................................................... 2-27
2-43. CPU to Rear Panel Interface........................................................ 2-27
2-44. CPU to Front Panel Interface....................................................... 2-27
2-45. Fan Monitor ................................................................................. 2-27
2-46. Front Panel Assembly (A2).............................................................. 2-28
2-47. Clock Regeneration Circuitry...................................................... 2-28
2-48. Refresh Failure Detect Circuitry ................................................. 2-28