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DAQM905A Dual 1:4 RF Multiplexer (50 Ω) Module
These modules consist of two independent banks of 4-to-1 multiplexers, which offer wideband switching capabilities
for high frequency and pulsed signals. The channels in each bank are organized in a "tree" structure to provide high
isolation and low VSWR. Both modules have a common earth ground, offer low crosstalk and excellent insertion loss
performance. To create larger RF multiplexers, you can cascade multiple banks together.
This module does not connect to the internal DMM. You can connect your signals directly to the on-board SMB
connectors or to the SMB-to-BNC cables provided with the module.
You can close only one channel per bank at a time on these modules; closing one channel in a bank will open
the previously closed channel. One channel in each bank is always connected to COM.
This module responds only to the CLOSE command (OPEN does not apply). To OPEN a channel, send the
CLOSE command to another channel in the same bank.
TO PREVENT ELECTRICAL SHOCK
To prevent electrical shock, use only wire that is rated for the highest voltage to any channel. Before removing
a module cover, turn off all power to external devices connected to the module.
CAUTION WITH MULTIPLE SIGNALS
To avoid the possibility of multiple signal sources becoming connected together, we recommend when
multiplexing two or more sources they should be connected on separate modules or on separate banks of the
same module.
CAUTION WITH HAZARDOUS VOLTAGES
When any channel is connected to a hazardous voltage source, all channels in the module should be treated as
hazardous and all channel wiring in the module should be rated for the maximum voltage applied. Ther-
mocouples attached to any other channel on the module should have insulation rated for the maximum
voltage, or have additional insulation added rated for the maximum voltage and should be isolated from
conductive parts using a thermal compound or tape rated for the maximum voltage applied. Do not mount,
move, or remove any thermocouples when the device under test is connected to a supply source.
ENVIRONMENTAL HEALTH AND SAFETY
When any channel is connected to a hazardous voltage source, the instrument and the device under test
should be supervised, following local EHS practices to restrict access.
Keysight DAQ970A/DAQ973A User's Guide
3 Features and Functions
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