PIC of noise between two materials DAQ

I have two data acquisition systems a number of measuring channels. The idling system is using two chassis SCXI and digitisation about 128 channels at 200 Hz. The low speed of computer uses a PCI - 6259 MIO.

8 eight channels are te would be on their way to a data acquisition hardware high speed at 8000 Hz. On the high speed computer, there's a spike of discerete to 5ms (corresponding to 200 Hz). High speed computer is a card PCI-6133 S-series (measurement of the differential mode).

When I change the low speed at 100 Hz scanning speed, the tip on broadband computer is 10 MS (corresponding to 100 Hz).

My question is if all digital lines controlling the SCXI chassis produce this spike that is being picked up by the high speed Board.

Both DAQ cards are installed on two different computers and are not connected in anyway except for the analog voltage signals 8 eight Tee would have turned off and connected.

Any ideas to solve this problem would be appreciated.

Thank you

Kind regards

Sudarshan.

561-714-1641.

This would have many things, but my first guess would be the ground loop. Are the computer connected to two different cards? If so, this can cause a ground loop. After that, it could be many other things.

Shielding

losing connections

interference

etc...

Tags: NI Software

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