Fluke 5725A instruction manual Theory of Operation

5725A

Instruction Manual

4	Theory of Operation		4-1
	4-1.	Introduction	4-3
	4-2.	Overall Functional Description	4-3
	4-3.	1100V AC Range Functional Description	4-5
	4-4.	11A Range Functional Description	4-6
	4-5.	Operation in the 11A DC Range	4-7
	4-6.	Operation in the 11A AC Range	4-7
	4-7.	Voltage and Current Standby Modes	4-7
	4-8.	Voltage Standby	4-7
	4-9.	Current Standby	4-7
	4-10.	How the 5700A and 5725A Communicate	4-8
	4-11.	Description of the Out-Guard Lines (5725A Side)	4-8
	4-12.	Description of the In-Guard Lines	4-9
	4-13.	Functional Summaries by Assembly	4-10
	4-14.	Detailed Circuit Description	4-11
	4-15.	Interconnect Assembly (A1)	4-11
	4-16.	Power Supply Assembly (A4)	4-12
	4-17.	High Voltage Supply Section	4-13
	4-18.	Switching Section	4-14
	4-19.	Current-Limit Section	4-15
	4-20.	System Supply Section	4-15
	4-21.	Fan Supply Section	4-16
	4-22.	Digital Assembly (A5)	4-16
	4-23.	Microcomputer	4-16
	4-24.	External RAM	4-16
	4-25.	External ROM	4-16
	4-26.	EEROM	4-18
	4-27.	Data Latch	4-18
	4-28.	Strobe Lines	4-18
	4-29.	Led Driver	4-18
	4-30.	Optoisolator Link	4-18
	4-31.	Break-Detect Circuitry	4-19
	4-32.	Power Up and Reset Circuitry	4-19
	4-33.	Watchdog Timer	4-19
	4-34.	Current Amplifier Assembly (A2)	4-19
	4-35.	Error Amplifier Section	4-21
	4-36.	Output Stage Section	4-22
	4-37.	Monitor Section	4-22
	4-38.	Control and Switching Section	4-23
	4-39.	Power Supply Section	4-23
	4-40.	High Voltage Amplifier (A3)	4-24
	4-41.	Input Amplifier	4-24
	4-42.	Integrator	4-26
	4-43.	Window Comparator	4-26
	4-44.	Input Clamp	4-26
	4-45.	Transconductance and Cascode Stage	4-27
	4-46.	Midstage	4-27
	4-47.	Midstage -400V Filter	4-27
	4-48.	High Voltage Heat Sink Assemblies	4-27
	4-49.	Autobias Current Source	4-28
	4-50.	Autobias Sense Circuit	4-28
	4-51.	High Voltage Amplifier Feedback	4-29
	4-52.	Signal Transformers	4-29
	4-53.	Temperature Monitoring	4-29

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