Recommended · for some experience
EEVblog #441 - How To Track Down Common Mode Noise
Why people recommend it
Dave Jones demonstrates how to identify and track down common mode noise; pointed to when scope readings of small signals look swamped by interference.
In their words
EEVBlog #441 - "How to track down common mode noise" gives additional hints and I think it's relevant.
LorenzoDonati4Ukraine-OnStrike on electronics.stackexchange.com, Jan 2017. CC BY-SA.
And please I would like ti have your comment about this video: [video] Do you think it is the same type of noise?
floppy380 on electronics.stackexchange.com, Dec 2016. CC BY-SA.