The design of a simple capacitance meter is often based on a relaxation oscillator.
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A "'capacitance meter "'is a piece of electronic test equipment used to measure capacitance, mainly of discrete capacitors.
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:If you're really interested and you have a capacitance meter, it'd be pretty easy to measure : just put a known-value blocking capacitor in series with the battery, short the combined battery-capacitor series circuit ( so the blocking cap charges up and no inrush current damages your meter ), attach the series circuit to your meter, and unshort the series circuit.
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