[Radio Wrangler]

With the centremost knob of the time/division stack fully anticlockwise ('main') this is the normal single-timebase setting..... but, if you bring the delayed timebase time/division (outermost ring of that stack) back out of the 'off' position, then the delayed timebase is anabled and will run (if it is triggered) and it will bright up the traces during its run time.

So you can see just when in the waveform you are studying, the fast (delayed) timebase will expand to fill the screen. Move the 10-turn delay pot and the delayed timebase time/div, to get the bright up over the feature you want to look at in detail. Select 'delayed' on the centre knob and this is what you get.

The bright-up mode is great for fiddling with the trigger of the delayed timebase if you need to use it. You get to see what you will get, in the context of the full waveform.

Slow trigger is optimised for trad TV field rates or slower, fast trigger is optimised for trad TV line rates or faster

David