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 

badbruno

I just installed a PS Audio Power Plant 15 yesterday and has made a HUGE improvement in my listening enjoyment. I was using a APC H15 power conditioner previously with good results but as soon as I lit up the PP15...bruh. Clarity, detail and dimensionality were significantly improved. Slam dunk purchase for me. PS Audio is selling them a 20% discount r/n on their website. 

pics:

https://drive.google.com/drive/folders/1sL_W8ctffvFCAiAGsrzazn_S2H2I6fo-?usp=sharing

@badbruno If you are asking me: The PP15 max output is 1500W. If you need more, they have the PP20. I'm running everything off my PP15 and only at 40% load.

Also: The reason I upgraded is b/c I noticed the system sounded better at different times of the day. 

@badbruno I think power is very important to all audio equipment.  Indeed, there are some amps that can handle bad power but all amps appreciate good power.  The advice to "plug your amp directly into the wall" comes from dealing with bad power conditioners, which is most of the less expensive ones, including some name brands. 

I am a big fan of PA Audio but I know there are others that are ok.  Bottom line it, filtering won't do it.  PS audio, and other effective models, rectify the power and then invert it (let me know if you don't know those 2 terms) back into very high quality power.  

So you got your scope working and got a trace?  excellent.  

Jerry

Power doesn’t make a difference crowd is counter to my experience. Two caveats here, my experience is limited to my local power and secondly, I haven’t tried a Honda generator. The greatest improvement to my system was the addition of the Shunyata Everest 8000 and Shunyata power cables. A second improvement came when I moved to battery for my full system. With a Synergistic Power Enhancer plugged into the inverter, Everest off inverter and full system, except turntable plugged into the Everest. I no longer care about local power, nor worry about lightening. My battery charger connects through both a home surge protector and a heavy duty, noisy local surge protector. That said, still no guarantee that lightening won’t fry my system, but less likely.