Measuring EMI Noise on AC Power Line?

Discussion in 'General Electronics Chat' started by mstephens, Jan 8, 2015.

  1. mstephens

    Thread Starter New Member

    Jan 8, 2015
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    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.
     
  2. Glenn Holland

    Member

    Dec 26, 2014
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    110
    Just be careful about using a scope to make measurements on a 110 volt power and make sure it's isolated.
     
  3. MikeML

    AAC Fanatic!

    Oct 2, 2009
    5,450
    1,066
    Those Corcom filters are a symmetrical Pi section, frequently used to prevent noise generated inside the device from leaking back into the line side.
     
  4. alfacliff

    Well-Known Member

    Dec 13, 2013
    2,449
    428
    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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