EMI testing at home
Howdy. I’m a solo designer with an eye towards producing a product at scale. Something I’d like to understand better is how one measures EMI before going through the certification process. I’m aware that I need to be thinking through EMI matters during the design phase, but I currently have no way (and no idea how) to measure things like current prototypes to see how “bad” or not they may be. And of course it sounds pretty terrible to go into certification “ignorant” of how my device is likely to perform.
I’m also vaguely aware that refining the EMI profile can be somewhat iterative - find a noisy source, tame it, this reveals a second noisy source, and so on. Again, this doesn’t sound like the sort of thing one iterates on by repeatedly going through the formal certification process.
I’m curious, then, how I might accomplish this at home on my workbench? Is it possible at all? I understand I’m unlikely to get “all the way accurate” results without shelling out big bucks, but is there an instrument (or instruments) I can use that might at least help me roughly measure my stuff, or help me identify problematic areas?
Thanks so much!