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2.2 Sensor Connection
PCIe/PXIe-6301 can support 2-wire, 3-wire or 4-wire RTD connection at
the same time. The wiring configuration used by each channel can be
independently configured by software.
2-wire RTD connection
When using a 2-wire RTD configuration, user needs to connect the
negative terminal of current excitation (Ex-) to the AI- terminal as shown
in Figure 2. Due to the presence of lead wires resistance, this type of
connection may introduce large measurement errors, which are related
to the material and material of the lead wire. This type of wiring is not
suitable for high precision temperature measurement needs.
Figure 2 2-wire RTD connection
