PCI-6733 signal noise when the computer screen is plugged, the weight on the case

Greetings,

I hope that it is in the right section.

Card: PCI-6733

I'm a 60 Hz, 2 mV peak-to-peak with a compensated 2.4mV noise when the monitor is plugged into the VGA port.

Same card in a second computer, problem is more serious, 4mV Ridge to Ridge, 4.3mV offset. When I push on the case near the power supply the offset rises from a few millivolts.

The two computers are running the same exact versions of software and drivers. Dell and quite similar to each other in both material and form.

I have a third computer that noise coming out of the map is horrible no matter what.

I exchange business cards and the problem is with the computer, does not follow the acquisition cards.

No idea how to solve this problem and what is the cause?

Thanks for any thoughts!

-Michael

Tall_Michael,

Looks like you may be plugging your monitor and your computer in different points of sale.  If this is the case, this is probably the cause of your noise and can be eliminated by connecting the two devices on the same socket.

Here are some articles that deal with the noise you are experiencing and various workarounds in the cases where what I mentioned above are not the case:

The problems of noise in the measurement configurations

Sources of the measuring Signal ground

How to eliminate noise on measures DC power without using a lowpass filter of material?

I hope this helps!

Thank you

Trey C.

Tags: NI Hardware

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