Idiomas disponibles
Idiomas disponibles
DAQM901A 20-Channel Armature Multiplexer Module
This module is divided into two banks of 10 two-wire channels each. Two additional fused channels are available on
the module (total in 22 channels) for making direct, calibrated DC or AC current measurements with the internal
DMM (external shunts resistors are not required). All 22 channels switch both HI and LO inputs, thus providing fully
isolated inputs to the internal DMM or an external instrument. During 4-wire resistance measurements, channels
from Bank A (channel n) are automatically paired with channels from Bank B (channel n+10) to provide the source
and sense connections. The module has a built-in thermocouple reference junction to minimize errors due to
thermal gradients when measuring thermocouples.
Only one of channels 21 and 22 can be connected to the internal DMM and/or COM at a time; connecting one
channel will close the other (thus shorting the input "I" to "LO").
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
195
