Keysight 34921A-34925A User’s Guide 33
One-Wire Mode
You may configure the 34923A as:
– two independent 40-channel 1-wire MUXes. This configuration requires
neither external wiring nor connection through the internal Analog Buses.
– one 80-channel 1-wire MUX. You must use external wiring or connect through
the internal Analog Bus for this configuration.
In 1-wire mode, you can close no more than 40 channels simultaneously due to
power dissipation. These channels are split 20 to a bank. For example, with one
Analog Bus relay closed you can close up to a maximum of 39 channel relays. If
you try to close more than the allowed number of channels, you will receive an
error message.
Because all bank relays supply only HI signals, you can apply a LOW signal
through COM1 L or COM2 L when you are making 2-wire resistance
measurements in 1-wire mode.
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