Multifunction DAQ

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NI 9215 open circuit voltage


I am using NI 9215 for analog input of +10 to -10 V. I usually use three channels as a differential input. However, with nothing connected to the DAQ (all three channels disconnected), one of the channels read an open voltage of around -10 V while others read around 0 V. I was expecting all to be around -10 V. Can anyone suggest what this means and whether this indicate a problem with the module?


Thank you,


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I think there is no worth to discuss a module behavior under no connection.

Nobody guarantee all channel do same behavior under the situation.


Why don't you try to connect AI+ and AI-? It should read 0V on all channel.

It provides a prove that the module works correctly.

Certified LabVIEW Developer
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