Two-Wire Mode; Four-Wire Mode; One-Wire Mode - Agilent Technologies 34921A User Manual

34923A 40/80-Channel Reed Multiplexer

Two-Wire Mode

You may configure the 34923A as:
• two independent 20- channel 2- wire MUXes. This configuration requires
• one 40- channel, 2- wire MUX. For this configuration, you must use
In 2- wire mode, you can close no more than 20 channels simultaneously
due to power dissipation. These 20 channels are split 10 to a bank.
However, note that Analog Bus relays count half as much as channel relays
in that total. For example, with one Analog Bus relay closed, you can close
up to a maximum of 19 channel relays. If you try to close more than the
allowed number of channels, you will receive an error message.

Four-Wire Mode

You may configure the 34923A as a 20- channel 4- wire MUX. This
configuration requires neither external wiring nor connection through the
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.

One-Wire Mode

You may configure the 34923A as:
• two independent 40- channel 1- wire MUXes. This configuration requires
• one 80- channel 1- wire MUX. You must use external wiring or connect
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.
20
neither the use of external wiring nor connection through the internal
Analog Buses.
external wiring or connect through the internal Analog Buses.
neither external wiring nor connection through the internal Analog
Buses.
through the internal Analog Bus for this configuration.
Because all bank relays supply only HI signals, you can apply a
N O T E
LOW signal through COM1 L or COM2 L when you are making
2-wire resistance measurements in 1-wire mode.
Agilent 34921A-34925A Low Frequency Multiplexer Modules User's Guide