"ooi_yw" writes:

Hi guys, as far as i know, light dimmer produces harmonic distortions
to the main supply. In order to check the distorted waveform which
contains many levels of harmonics, where should I check the output? I
mean is if i want to use an oscilloscope to capture the image of the
distorted waveform, where should I put the probe of the oscilloscope.

Putting the scope on the Hot before the dimmer will get you started.
if I understand what you want to do.

But what you probably really want is A-B between the Hot before the dimmer
and the Neutral used by the load.

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