On 03/15/2011 12:16 PM, Kirk Wallace wrote: > In order to investigate three phase issues more, it would be nice to > measure at least two waves at a time. I have a two channel scope, but > the channels are ground referenced. I can float the scope, but I think > this will only allow me to measure one signal, or two if they happen to > have the same reference point. Plus I don't think floating the scope is > the safest practice for me or the scope. What might be good is to have a > box that floats like a DVM but can feed a scope channel. What sort of > keywords should I use to find such a thing, or is there a better way? > You use a potential transformer. Find a pair of matched transformers, such as a 12 V output one, then you have a 10:1 reduction plus isolation on two totally independent voltages.
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