In reply to:
If you plugged the machine into anything but a hospital grade receptacle (especially a power bar), you would see 60hz interference in the EEG signal. when plugged into a hospital grade receptacle, that went away.
But was that because of a hospital grade plug, or was that because the hospital grade plug was wired to a circuit separated from the fluorescent lights, air handlers, floor waxers, paging system, etc...?
Our video booth has a discreet ground from the rest of the building as well (with regular "orange triangle" plugs as a demarcation) depending where else in the building you get power from, but you can find 60 cycle hum on a few of the 4 distinct grounds in the building. (especially where the ice plant gets it's power!)
Bren R.
