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RE: I don't know how the power supply is...

You can look at how long one complete cycle takes. Your scope displays in time (most likely), so count the distance from start to end of cycle and invert to get hertz. 120 hz is 0.0083 (8 ms) seconds, for example. So if you set horizontal to, say 5 ms/div, then you should count one whole square and 3 additional tenths to = 8ms if it is 120hz hum.


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