Multiple read RTD with myDAQ

I'm working on a project with myDAQ requiring three RTD constantly reading.

Two of Thermistors are 3 wires, the other is 4 wires. I followed the tutorial on the RTD Web site with a difference - I connect the RTD to the analog input. The excitation current is supplied by the power supply 5V on the myDAQ. I measured the current to be 37.3mA. When I open the DAQ assistant and choose all the parameters, the resistance reading is a constant 124 ohms. I held the RTD in my hand, put it in ice water, and reading this has not changed. However, when I provided power to the RTD and checked the resistance with a multimeter, it read 115 and this resistance * fact * change when it is placed in ice water.

Can someone help me out here?

I couldn't see the guide that you linked, it seems that it redirected to this forum?  If you were referring to the myDAQ, then you can use a 3 or 4-wire thermocouple, just in mode 2 son like that described in the article I linked.  And Yes, this measure seems to be only possible between HI and COM, not between analog input + /.

Tags: NI Products

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