I am looking for some assistance with using my scope for diagnosing electric motors as another tool in my bag sort of speak. Scopes are not normally considered as a field expedient tool however cost and size for scopes have come way down so the industry is on the cusp of new ways of doing things. The downside is there is not a whole lot of information out there.
I did find a couple of articles that discuss using a scope's Fast Fourier Transform (FFT) setting as a spectrum analyzer to measure background noise. However, the articles do not provide any useful information like recommended settings or have very little on what one should or should not see on their scope. Does anyone have some working experience using scopes on electric motors for detail analysis?
I am currently dealing with an intermittent problem with a large 200hp motor that I am pretty sure is bad and will likely need rewinding like 99% certain mainly through the process of elimination. The problem is the customer has been burned by another contractor for $15,000 dollars already and a full rewind will be about $20,000 already.