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Negative voltage on disconnected AINs


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#1 Peter S

Peter S
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Posted 18 June 2015 - 02:38 AM

Hi. I connected a U6 to a new PC and notice that I am getting negative voltage readings despite no channels being connected. The voltage reading increases with channel number by about 1.1 volt. If I short circuit between GND and any AIN I get a reading of 0. I have used this device several times before, and seem to remember that in a disconnected state the channels read approximately 0 volts. Should I be concerned or just carry on?

Cheers

Peter

 

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#2 LabJack Support

LabJack Support
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Posted 18 June 2015 - 11:51 AM

No reason to be concerned.  Readings from floating channels are tough to predict and pretty much meaningless:

 

http://labjack.com/s...s-guide/2.6.3.8




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