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Edited by OASJ2YSeeEhBQo1 at 2019-4-2 11:10
Stop! You can't probe mains voltage with this scope and x10 probe. You gonna permanently damage your scope, your probe, your PC and probably hurt yourself.
The maximum input voltage of the 6022BE is 5V peak, with a x10 probe you can measure 50Vp only. You are trying to measure 240Vrms that is 340Vpeak! (Vpeak = 1.41*Vrms) way higher. (Probably what you are seeing is the waveform clipped by the protection diodes, the pictures is not attached).
To do what you want safely you will need first some more knowledge (to understand the risks involved) and then, an isolation transformer and a high voltage probe with attenuation of at least x100, like the Hantek T3100. Ideally you want to use a high voltage differential probe (expensive).
There are some good and more detailed information on Youtube if you search for it.
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Post time 2019-4-2 08:14:55