ECN Forum Forums Technical Discussion Electrical Theory and Applications Floating Ground - device being tested or scope?

I lived in the digital world so we never used the X input. You can plot the 2 outputs from a stereo audio amp to get interesting patterns tho.
I knew some guys who rigged an old Heathkit GR25 TV to do it.
I also played with doing it with a laser to project on the wall but lasers were tough in those days. (no diodes)