Tutorial 7
Keysight 34970A/34972A User’s Guide 317
Four-Wire Multiplexers
You can make 4-wire ohms measurements using the 34901A and 34902A
multiplexers. For a 4-wire ohms measurement, the channels are divided into two
independent banks by opening the bank relay.
For 4-wire measurements, the instrument automatically pairs channel n with
channel n+10 (34901A) or n+8 (34902A) to provide the source and sense
connections. For example, make the source connections to the HI and LO
terminals on channel 2 and the sense connections to the HI
and LO terminals on channel 12.
When making a 4-wire measurement, the test current flows through the source
connections from the HI terminal through the resistor being measured. To
eliminate the test lead resistance, a separate set of sense connections are used as
shown below.
Channel 1 Source
Channel 11 Sense
Channel 12 Sense
To DMM Source
Bank Relay
To DMM Sense
Channel 2 Source
If any channels are configured to be part of the scan list, you cannot close
multiple channels; closing one channel will open the previously closed channel.
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