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inspector1994 inspector1994
wrote...
11 years ago
Does it measure impedance, current, or time constant, etc. then uses that value to compute for capacitance and dissipation factor?
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wrote...
11 years ago
All those things, in different meters.

Capacitance equals current over volts per second.
C =  I/V/s
For precision small capacitance values the meters are usually analog, and hold the volts per second constant while measuring the current, which can be measured at high speeds more easily than volts/second
http://nov55.com/cap/cap1.htm

Others use oscillators:
http://freecircuitdiagram.com/2008/08/11/capacitance-meter-using-555-oscillator/

You will find many schematics and much information by Googling
capacitance meter schematic
.
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