There is always the venerable HP745A.
? (up to110KHz)
A Rube-Goldberg, if there ever was one.
Quite accurate for an instrument 50+ years old.
I have two, different vintages, and both quite close to each other,still.
Watch the +1,000 volt settings, tho.? One handed operation.
Don N5CID
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On 8/13/2022 4:42 PM, Dr. David Kirkby,
Kirkby Microwave Ltd wrote:
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On Mon, 8 Aug 2022 at 10:15, tgerbic <
tgerbic@...>
wrote:
I would like to get some
thoughts from others about how they do AC calibration
outside of a rheostat/isolation transformer on a 50/60Hz
power line, or a sinewave generator for low voltages.
Another possibility below 1 MHz or so,
would be a light bulb and light meter. Apply AC to the
lightbulb and it will glow. The light meter indicates the
illumination level. Then apply DC to the light bulb to produce
the same level of illumination as the AC did. That allows you
to calculate the RMS voltage of the AC source.
Problems would arise when the
inductance of the bulb becomes significant, but I doubt that
would be an issue below at least 1 MHz.
I'm pretty sure that above would work,
but I don't know what uncertainty you could achieve.
Dave
