How to test your device for EMI noise with an oscilloscope

[NattyLumpkins]

This video explains the basic principles and techniques used when debugging EMI issues using an oscilloscope and near-field probes.

 

[DonH56]

I did not watch the video, but a couple of issues using a 'scope are low sensitivity since DSOs have a fairly high noise floor, and limited bandwidth using a typical inexpensive'ish 'scope. I much prefer to use a spectrum analyzer, but of course that is not cheap... A little loop probe serves well.

 

[NattyLumpkins]

I did not watch the video, but a couple of issues using a 'scope are low sensitivity since DSOs have a fairly high noise floor, and limited bandwidth using a typical inexpensive'ish 'scope. I much prefer to use a spectrum analyzer, but of course that is not cheap... A little loop probe serves well.

Yes I realized that right after I posted it but thought I would leave it up anyway. Did you ever test any of your audio equipment just out of curiosity?

 

[DonH56]

Yes I realized that right after I posted it but thought I would leave it up anyway. Did you ever test any of your audio equipment just out of curiosity?

Yes, but years ago. EMI was part of my day job so unless some "good buddy" was invading my system I didn't pay it much mind. The only problems I recall were on some phono inputs and one of my tube amps when the cover was off (it was OK with it on). It was a much bigger deal doing live sound reinforcement where runs were long and the environment typically much noisier.

 

[somebodyelse]

How good or bad is the very cheap rtl-sdr option in comparison?
https://www.rtl-sdr.com/tag/emi/