Measuring EMI with spectrum analyzer or oscilloscope?

Discussion in 'General Electronics Chat' started by ztjust, Jun 22, 2012.

  1. ztjust

    Thread Starter New Member

    Apr 1, 2012
    Hello, I am looking to purchase an E&H Near Field Prove set to measure the EMI of DC circuits. I have an oscilloscope, but I was wondering if I actually needed a spectrum analyzer instead. The manual says I can use either, but since an oscilloscope only works in the time domain, would that even be practical? Does the circuit being DC have anything to do with it?
  2. praondevou

    AAC Fanatic!

    Jul 9, 2011
    Some newer digital oscilloscopes (even simpler ones) can be configured to work as an spectrum analyzer. But I would prefer using a real spectrum analyzer, which will give you much more precision and analyzing functions.
  3. chuckey

    Well-Known Member

    Jun 4, 2007
    If the the circuits are DC then they cannot radiate EMI !! However if there is switching going on, a CRO would be better. Spectrum analysers are good for high frequencies >10MHz, but absolutely useless for 60 or 100 HZ.