From: Joe Foley (redmenaced@yahoo.com)
Date: Thu Apr 03 2003 - 18:32:37 PST
> A measurement at 10 MHz will be meaningless.
+++++++++
Hmm,..... better tell the military! The ZM-11 has
been around since the early '50's! 10.79 MHz is the
test freq. on that unit.
Where'd you find that formula?
Joe
The
> wiring is significant fractions
> of a wavelength and will not yield anything
> meaningful. If you want to measure
> the capacitance it should be done at some audio
> frequency, like 60, 400, or 1000
> Hz. I'd still suggest disconnecting the battery and
> using the capacitance range
> of a cheap DMM. (Check for voltage before connecting
> the capacitance function)
>
> For Techies: These meters likely use a current
> source and time the rise of the
> capacitor's voltage to a specific value. Since I=C
> dV/dT, if you re-arrange
> this you get dT = C * dV / I . So if dV and I are
> constant, and scaled
> correctly, the time to charge is directly
> proportional to the C.
>
> -John
>
>
>
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