Perhaps not against hams, but cases of FCC enforcement actions against
commercial users of test equipment have occurred.

Jim, I am a pilot, etc. I am aware of enforcement actions against
radio repair stations for radiating excessive power on the same
frequency as the VOR on the field, etc... But, I was very specific in
my comments... No enforcement action against a ham for using test
equipment - ever - insofar as I know... This is so unlikely as to
equal betting on the Megamillions Lottery this weekend, for several
reasons... The first reason is that we are licensed to radiate those
emissions in the first place... The second reason is that
unintentional interference must be accepted in the ham bands per the
regulations... The third is, Rily has a sense of humor...

73 - denny