[volt-nuts] AC Voltage Measurement Standards

Poul-Henning Kamp phk at phk.freebsd.dk
Wed Jul 9 08:03:50 EDT 2014


In message <trinity-2e0df2e8-1978-44c0-8d7f-1248885e1b2e-1404906840284 at 3capp-gmx-bs72>, acbern at gm
x.de writes:

>Very good accuracies are achieved by thermal converters (Ballantine...).
>You can do DC to AC comparison measurements with a few ppm accuracy.
>But measurements are slow, and you need a nanovolt meter.

And very stable surrounding temperature.

Thermal converters measure the heating caused by the electric energy
as a temperature increase over ambient temperature.

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