I have a BNC 2090 for acquiring 12 channels signals using the DAQ 6052E CArd, connected via SCXI 1180. I have configured the Channels in hardware and software as single ended NRSE since I have 12 signal that need to be measured and the 6052E has 15 channels in SE mode ( ch0 is for the SCXI CHASSIS).
On the BNC 2090, the configuration of the channels is
0 1 2 3 4 5 6 7 (UPPPER CHANNELS)
8 9 10 11 12 13 14 15 (LOWER CHANNELS)
When I connect the 7 of the 12 signals ( from Channel 1 – 7) , I can see signals perfectly.
However when I connect the remaining 5 (channels 8 -12), that seems to ‘greatly attenuate’ and DISTORT the signals on the ‘UPPER” channels. If I disconnect the lower 5 channels then the upper channels read correctly.
I have attached some snapshots of the graphs (NON FILTERED). They are self exaplatory.
Am I creating some ground loops?. If yes, then how can I remove them ?.
