[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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Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
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