05-12-2015, 09:29 PM
Unless I had an awful lot of transformers to check I wouldn't feel it worth a specialist bit of kit. Signal generator, DVM and possibly scope are all that's needed. Oh yes, and a few croc clip leads.
For audio transformers, measuring around 1kHz seems sesnsible. DVM and sig gen will quickly give you the ratio. Scope only needed to determine phasing though it can also be used to see gross distortion and see when the transformer starts to saturate as you wind up the voltage.
For power transformers then the standard open circuit and short circuit tests tell you most of what you need to know. I'm sure that Ed will explain them rather better than I. A reminder that the short circuit test is not done with full voltage applied
For audio transformers, measuring around 1kHz seems sesnsible. DVM and sig gen will quickly give you the ratio. Scope only needed to determine phasing though it can also be used to see gross distortion and see when the transformer starts to saturate as you wind up the voltage.
For power transformers then the standard open circuit and short circuit tests tell you most of what you need to know. I'm sure that Ed will explain them rather better than I. A reminder that the short circuit test is not done with full voltage applied
www.borinsky.co.uk Jeffrey Borinsky www.becg.tv
