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usb 6501: 200 Hz noise

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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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