My voltage input reading are floating around and cant seem to get an accurate reading of any kind. What is causing this?
Im trying to input a DC voltate on channel 1. So i hook up +5 to the channel 1 analog input, and hook up ground to the AIGND. When i measure it in continous time, i get a reading of -1.3 V, when i move the cable connecting the NI board and the DAQ, the voltage jumps around. I even tried connecting AIGND straight to channel 1 analog input, and read a voltage of 2.3, but its not stable, it jumps around a lot. What is this problem. please help
This is going to depend on how you have your DAQ board configured. In differential mode, the positive input is channel 0, but the negative input is channel 8 (for 8 differential/16 single ended MIO boards. Channel 32 is - on 32 differential/64 single ended MIO boards). (Similarly, chan 1 (+) and chan 9 (-) are the next channels, etc).
For single ended mode, chan 0 is the +, and AIGND is the -.
I suspect you have your board in differential mode, and your - is not connected to the correct pin; therefore, your voltage is floating.
Mark
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