Theory of Operation 4
Keysight 34420A Service Guide 113
schematic). The high voltage divider can only be connected to channel 1 input.
The maximum range on Channel 2 input is 10 V.
Resistance measurements are made by applying a known current through an
unknown resistance. The current is supplied from the Channel 1 HI input terminal
and returns to the Channel 1 LO input terminal. The resulting voltage drop across
the unknown resistance is then measured by the meter's dc circuitry. In the 2-wire
ohms function, the voltage drop is measured across the Channel 1 HI and LO
input terminals. In the 4-wire ohms function, the voltage is measured across the
Channel 2 HI and LO input terminals.
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