I would like to measure mains voltage (110-240V, 60Hz), but I want my measurement circuit to be isolated from the voltage being measured. I am going to be sampling the waveform at a high sample rate (relative to the 60Hz waveform being measured) and comparing that with the current on the same lines with (near-)simultaneous measurement. So it is important to me that the voltage waveform not be distorted or phase-shifted, and the voltage I see should be related to the source voltage by a simple linear ratio.
Seems like a simple transformer will do it, in theory. But I'm not sure about how they will work in the real world. Do transformers distort the voltage waveform or phase? What happens if I put a load on the secondary of more than a few nA? What non-linearities are there? What sort of transformers are going to give me the best response? Or if the transformer idea is awful, any other ideas for isolated voltage transducers? TIA, Randall _______________________________________________ geda-user mailing list [email protected] http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
