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Signal Descriptions
Table 2-2 describes the signals found on the I/O connectors along with the internal signals.
I/O
Connector
Signal
Signal Name
EX<0..19>+
EX<0..19>–
AI<0..19>+
AI<0..19>–
RSVD
*
RTD input channels require both excitation ± and measurement ± connections. This can be 2, 3, or 4
terminals, but the channel is still called AI<0..19> in software regardless of the wiring configuration.
Measuring Temperature with RTD Sensors
This section explains how to take an RTD temperature measurement using the NI PXIe-4357
and National Instruments software. For an introduction to temperature measurements, refer to
and enter
ni.com/info
To measure temperature with an RTD, you use the NI-DAQmx driver software and its functions
and VIs that are packaged with your NI PXIe-4357. With NI-DAQmx, you can configure your
temperature measurement interactively with the DAQ Assistant—a graphical interface for
configuring measurement tasks, channels, and scales—or programmatically with your
application development environment such as LabVIEW, LabWindows
Measurement Studio.
To find out more about using NI-DAQmx, refer to the NI-DAQmx Help, which is installed at
Start»All Programs»National Instruments»NI-DAQ by default.
Table 2-2. I/O Connector Signal Descriptions
NI-DAQmx
*
AI<0..19>
Positive excitation—Connects to the positive current
output of the channel. This is also the positive input
channel for 2- and 3-wire configurations.
*
AI<0..19>
Negative excitation—Connects to the channel ground
reference. This is the return path for the corresponding
EX+ channel. This is also the negative input channel for
2-wire configurations.
*
AI<0..19>
Positive input channel for 4-wire configurations.
*
AI<0..19>
Negative input channel for 3- and 4-wire configurations.
—
These pins are reserved for communication with the
accessory or that are not used for connections.
.
exp68w
NI PXIe-4357 User Manual
Description
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