LabVIEW

cancel
Showing results for 
Search instead for 
Did you mean: 

False voltage signal NI PXI-6052E

I am using the instrument  NI PXI-6052E to measure voltage.  There is a large voltage signal that comes out when there is no voltage passing through the wire.  The signal is about 3V, but it seems to vary a little (but not periodically).  I have tried to do a number of things in both Labview and with the physical set up, but there is still this huge error.  Can anyone help me?
0 Kudos
Message 1 of 3
(780 Views)
What exactly do you mean by 'no voltage passing through the wire'? If the input signal is open, then what you are seeing is not unexpected - search for the topic 'ghosting'.
0 Kudos
Message 2 of 3
(772 Views)

Hey, I forgot to reply with what happened.  So, the imput signal wasn't open, but I looked up ghosting anyway and it helped.  In the end, it turned out that we were using ports with different ground potentials.

 

Thanks.

0 Kudos
Message 3 of 3
(717 Views)