The principle of measuring capacitance with a multimeter
In the cheap multimeter, the capacitance measurement is obtained by converting the charging time of the measured capacitance into a pulse through the time base circuit, integrating the pulse, and then measuring the integrated value.
Slightly better may use quadrature detection, that is, the so-called digital bridge, after measuring the phase difference, use the single-chip microcomputer to calculate the result of the reactance. In addition, the frequency method can also be used to measure the capacitance through the frequency change of the oscillation circuit. C diff -> Freq Diff frequency change can be measured with a counter, or read out with a voltmeter for F -> V conversion.
