Measuring EMI Noise on AC Power Line?

Thread Starter

mstephens

Joined Jan 8, 2015
1
I am using some CorCom EMI noise filters in a simple 120VAC outlet strip. I'd like to measure the line noise before and after the filter using an oscilloscope. What would be a good circuit for this?It would be nice to measure the noise on the ground too. Thanks for any advice.
 

MikeML

Joined Oct 2, 2009
5,444
Those Corcom filters are a symmetrical Pi section, frequently used to prevent noise generated inside the device from leaking back into the line side.
 

alfacliff

Joined Dec 13, 2013
2,458
there are current transformers (clamp on) that work for this, they also couple the high frequency componant of the current passing through them. general radio made some good ones, there are also scope probes with clamp ons which let you see the noise.
 
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