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DAQM904A 4x8 Two-Wire Matrix Switch
This module contains 32 two-wire crosspoints organized in a 4-row by 8-column configuration. You can connect
rows and columns between multiple modules to build larger matrices such as 8×8 and 4×16, with up to 96
crosspoints in a single mainframe. Use this module to connect multiple instruments to multiple points, or any
combination of inputs and outputs on your device under test at the same time.
This module does not connect to the internal DMM. Each crosspoint relay has its own unique channel label
representing the row and column. For example, channel 32 represents the crosspoint connection between row 3 and
column 2 as shown below:
You can close multiple channels at the same time on this module.
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
201
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