I remember years ago at a station, that we had a Panasonic monitor that had a video transformer in the video input. It took the external video input BNC connector and isolated it from the hot ground chassis. I didn't think that was too unusual and there must be other manufacturers using that idea if Panasonic was using it. The video quality was good. It was a Pro-line monitor. They trashed the monitor when we moved the station and I regret I didn't pull the circuit board. I've never seen that in a monitor since.
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