Fluke 5700A Series - Chapter 2 Theory of Operation

5700A/5720A Series II
Service Manual
ii
1-34. AC Current Specifications................................................................ 1-36
1-35. Wideband AC Voltage (Option 5700-03) Specifications................. 1-41
1-36. Auxiliary Amplifier Specifications .................................................. 1-42
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