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Published 20 hours ago • verified publisher icon open-ephys

plugging in digital I/O HDMI cable gives increased noise in headstage inputs

Open mvdm opened this issue 10 years ago • 2 comments

On our v2.1 acquisition board with RHD2132 headstages, plugging in a HDMI cable into a digital I/O input port on the board causes an increase in the noise level in the data coming from the headstage (eyeballing it, mostly 60Hz line noise):

HDMI cable unplugged hdmi_unplugged

HDMI cable plugged in hdmi_grounded

This is with the HDMI cable ground connected to the ground on the acquisition board. (Without this the noise really becomes terrible.) The sine wave is a 77uV 16Hz test signal from our signal generator.

Is this a known issue? Any recommended fixes?

mvdm avatar Sep 26 '14 21:09 mvdm