>I know one of the tricks to detect flickering: look at the emitter through a camera, e.g. that of a phone.
This would be a really poor driver, effectively using the AC freq. and shutting off w/ each cycle/zero cross. Unfortunately, many are exactly like that. However - some cameras do have compensation for exactly this issue, and they may hide it.
>How would you instead check EMI - in general? (I am not a specialist in this area.)
Use an AM radio. (That would depend on the frequency and what not, but AM radios are a pretty neat trick to check)
This would be a really poor driver, effectively using the AC freq. and shutting off w/ each cycle/zero cross. Unfortunately, many are exactly like that. However - some cameras do have compensation for exactly this issue, and they may hide it.
>How would you instead check EMI - in general? (I am not a specialist in this area.)
Use an AM radio. (That would depend on the frequency and what not, but AM radios are a pretty neat trick to check)