> zoom

On my scope it's a double timebase. A second (third) trace appears that
shows an enlarged part of the CH1. This has a second timebase switch and a
fine delay adjust with a 10-turn pot. You can view a single TV selected
line or a particular part of a switching pulse etc with this. The portion
in the original CH1 trace that is being zoomed is highlighted (trace is
brighter there). The Y gain setting is the same as for CH1 and there is an
offset button to separate the two traces conveniently.

The effect is obtained by using the CH1 trigger pulse to start a delay
(adjusted by the 10-turn pot). When that expires the 2nd trace is released
and scans with a speed set by the 2nd timebase switch. Thus you have a
zoomed in portion on the CH1 signal and you can set its width and position
separately.

Peter

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