Four-Wire Mode; One-Wire Mode; Interlock Protection - Keysight Technologies 34921A User Manual

– one 40-channel, 2-wire MUX. You must use external wiring or connect through

Four-Wire Mode

– You may configure the 34925A as a single 20-channel 4-wire MUX. This

One-Wire Mode

– two independent 40-channel 1-wire MUXes. This configuration requires
– one 80-channel 1-wire MUX. You must use external wiring or connect through
Because all bank relays supply only HI signals, you can apply a LOW signal
NOTE
through COM1 L or COM2 L when you are making 2-wire resistance
measurements in 1-wire mode.

Interlock Protection

This module is interlock protected, which means whenever the D-sub connector
end of the modules is exposed, the Analog Bus relays immediately open and
disconnect from the Analog Buses. For more information, see
page 11.
Keysight 34921A-34925A User's Guide
the Analog Bus relays to for this configuration.
configuration requires using neither external wiring nor connecting through the
internal Analog Buses. For 4-wire resistance measurements, the instrument
automatically pairs channel n on Bank 1 (source) with channel n+20 on Bank 2
(sense) to provide these connections. Four-wire controls occur only when
doing 4-wire measurement operations through the internal DMM, such as
MEASure:FRESistance? or scanning a channel previously configured as
4-wire.
neither using external wiring nor connecting through the Analog Bus relays.
the Analog Bus relays for this configuration.
"Safety Interlock" on
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