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usb 6501: 200 Hz noise

Hi

 

I use the NI USB 6501 device to send trigger signals to a EEG recording system (Nicolet C64 amplifier). As soon as I connect the NI-device to the EEG system (analog Input channel 1), I get very strong noise in the EEG signal at precisely 200 Hz.

 

Any ideas on what the source of this 200 Hz noise might be?

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Hi,

 

maybe there is an grounding issue.

This document might help:

http://www.ni.com/white-paper/3344/en/

 

Is it an digital or an analog trigger?

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Work with NI Hard- and Software for about 15 years now.

Certified LabVIEW Developer & TestStand Developer/Architect

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Hi

Thanks for the input. I will check possible grounding issues.

 

The signal is sent to an analag input (ai1) of the recording device.

6501     =>  eeg-device:

Output  =>  ai1

GND     =>  GND

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