Keysight 34420A Nano Volt / Micro Ohm Meter
Service Guide
109
4 Theory of Operation
Block Diagram 110
Input and Protection 112
Function Switching 114
DC Amplifier 115
Ohms Current Source 117
A-to-D Converter 120
Configuration Data Shift Register 122
Floating Logic 123
Earth-Referenced Logic 126
Power Supplies 127
Front Panel 128
This chapter is organized to provide descriptions of the circuitry contained on
each schematic shown in chapter 9. A block diagram overview is provided
followed by more detailed descriptions of the circuitry contained in the schematics
chapter.
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