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Title: How do a capacitance meter measure capacitance and D-factor? Post by: inspector1994 on Oct 20, 2012 Does it measure impedance, current, or time constant, etc. then uses that value to compute for capacitance and dissipation factor?
Title: How do a capacitance meter measure capacitance and D-factor? Post by: rizzy81 on Oct 20, 2012 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 . |