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

Here's a nice video on Lissajous patterns. Your external X amplifier is useful for studying phase relationships.
https://www.youtube.com/watch?v=t6nGiBzGLD8
It might remind you of "The Outer Limits".
You would use TV Frame triggering and usually - slope to look at composite video signals. Some scopes can select between even and odd fields. Frame rate is almost 30Hz and the color frame rate is almost 15Hz.
The stability adjustment on my 15MHz Heathkit scope, had to be adjusted to get a full width horizontal trace.
Joe