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Low Frequency Multiplexer Modules
34922A 70-Channel Armature Multiplexer
The high-density 34922A 70-Channel Armature Multiplexer (70-Ch Arm MUX) is
divided into two banks with 35 latching armature switches (channels 1-35 and
36-70) in each. This module also contains eight armature Analog Bus relays
(channels 911-914 and 921-924), four on each bank that can connect the bank
relays to the system Analog Buses. Through ABus1 and ABus2 you can connect
any of the channels to the internal DMM for voltage or resistance measurements.
Refer to the simplified schematic on
Using program commands or the mainframe front panel, you can control each of
the channel switches individually, and thus configure the 34922A in these
modes:
- two independent 35-channel 2-wire MUXes. This configuration requires
neither using external wiring nor connecting through the internal Analog
Buses.
- one 35-channel 4-wire MUX. This configuration requires neither using
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+35 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 70-channel 2-wire MUX. You must use external wiring or connect through
the internal Analog Bus relays for this configuration.
For example, closing Analog Bus channels 913 and 923 connects
Bank 1 and Bank 2 through ABus3. Or, externally you can connect COM1 to
COM2 to create this configuration.
This module has capability to scan as many as 100 channels/second using the
internal DMM. With the automatic "break-before-make" connection operation,
you are assured that no two signals are connected to each other during a scan.
When using the module in a non-scanning mode, you can close as many
channels as you wish.
This module is interlock protected, which means whenever the D-sub connector
end of the modules is exposed, the Analog Bus relays automatically open and
disconnect from the Analog Bus. For more information, see
page 11 and
When the power is off, all channel relays maintain state, and the Analog Bus
relays open.
22
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
page
"34922A D-Sub Connectors"
Keysight 34921A-34925A Low Frequency Multiplexer Modules User's Guide
34922A 70-Channel Armature Multiplexer
23.
"Safety Interlock"
on page 24.
on
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