Does the multimeter measure DC capacitance?

Question

Electronics

Do millimeters (RLC meters) without frequency selection measure DC capacitance?
Do frequency selectable RLC meters measure AC capacitance? And such multimeters can't measure DC capacitance?

How can one understand the following sentence about measuring capacitance C of a piezoelectric transducer: "The value of C should be measured by an AVO meter under Dc state". As I understand AVO meter is a multimeter. And what can be meant by "an AVO meter under Dc state"?

Answer 1

Yes, the usual multimeters measure capacitance and inductance on alternating current. But there is a way to measure capacitance at direct current. To do this, use the "time constant of the RC circuit" parameter:

We charge the capacitor to a known voltage, then we discharge it to a resistor with a known resistance. At the moment the resistor is connected, you need to start the stopwatch, and when the voltage on the capacitor drops by about two thirds (exactly - to the level of 36.8% of the original), the stopwatch will show the value of the time constant (tau in the formula above). Knowing tau and resistance, we elementarily calculate the capacitance using this formula.