09-27-2014 09:03 AM
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?
09-29-2014 06:19 AM
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?
10-01-2014 03:08 AM
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