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For a 3 wire RTD, wire the RTD between your AI channel (AI3, pin 14) and a ground pin (pins 7, 8, 16, 24). Wire the current source (RTDC, pin 25) to the RTD on the same side as you wired to the AI channel. For 4-wire you simply add another ground wire from the RTD to a ground pin (pins 7, 8, 16, 24).
