How can I measure the noise on my AC mains with a 2ch oscilloscope?

I’m not an EE so although I have some nice test equipment I need help. Here is the problem, the AC Mains are 120 vac but I’m trying to measure the noise on the AC signal , millivolts. I’d like to answer two questions how bad is my power and second  does my isolation transformer make a difference.


thanks for the help 


I'm definitely sold on the Audioquest Niagara solution at this point, but Shunyata, despite a very different design philosophy, also makes superb gear.  Just be sure that you deploy comparable power cables on your amplification components.  The conditioner is only part of the story.

Good luck.  Hope I was able to help even a little.



yes your involvement was helpful and has given me new factors to consider while on this path. And good luck while enjoying your superb system !

it’s been a pleasure have the conversation 



If only Edison had won the power war. We would have DC direct from the wall outlet. 😊

"Live Music" is full of phase anomalies, microphone differences, crowd murmurs and smells, bow rosin dust, insane sound technicians, a lack of sound technicians, balding head reflections, unseasoned wood flooring, drapery...all of which you can try to measure or simply sit there and listen to it. What a mess...