We need to monitor the voltage changes over 10 minutes using two channels. Channel 1 (ai0) is the output of a chamber pressure gauge. Channel 2 (ai2) is the signal from a device which response the chamber pressure change.
I try to find how well the USB-6001 measure the chamber pressure. I short pin 2 & pin 6 and find the ai2 signal changes following the ai0. The ai0 signal reduced from 9 to 5.5 VDC. The ai2 signal increased about 1mv. Is this normal for USB-6001? Or, do I use the differential mode correctly?
I attached NI Max setting, the DAQ wiring and test results.
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