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I checked my manual the white green should be 22v pp close enough to sams 20v.
you need to calibrate the scope use a 9v battery if there is no calibration point on the scope (more modern ones have a 5v pp square wave generator to test to). put a 9v battery and note how far a trace deflects, adj the vert amp to get a size that is easy to work with and will nearly fill out the screen on the scope if it was 22v (so make the 9v move the line little less than 1/2 the screen that way a 20v spike will nearly fill it. There are markings on the screen if you try to use those to represent 1v each.
increasing the sweep rate should let you see fewer spikes. I dont know much about scopes only the one I have, so not sure how keying works on yours.
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