compensates for the error that lead resistance causes in 3-wire
mode.
If you are using a 4-wire RTD, connect EX to the positive lead of
the RTD. If you are using a 3-wire RTD, do not connect the RTD
to the EX terminal.
Figure 1. Connecting an RTD to the NI 9216
NI 9216
4-Wire EX
RTD+
RTD
–
COM
RTD
For the best measurement results when using the NI 9216 with a
3-wire RTD, use equal-length wires between the RTD+ terminal
and the RTD and between the COM terminal and the RTD. Also,
keep the lead resistance within 5% of the nominal RTD value.
The NI 9216 accuracy specifications account for this lead error.
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NI 9216 Getting Started Guide
