National Instruments NI 9226, Руководство по началу работы

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Table 1. Signal Descriptions
Signal Description
COM Common reference connection to isolated ground
EX+ Positive sensor excitation connection
NC No connection
RTD+ Positive resistance temperature detector connection
RTD- Negative resistance temperature detector connection
Connecting 3-Wire and 4-Wire RTDs
You can connect any combination of 3-wire or 4-wire RTDs to
the NI 9226. Each NI 9226 channel contains circuitry that
automatically detects the type of RTD connected to the channel.
The NI 9226 scans all eight input channels and automatically
configures each channel for the appropriate mode. In 4-wire
mode, the EX terminal is a 0.1 mA current source. In 3-wire
mode, the RTD+ terminal is a 0.1 mA current source. The
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