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Last Updated on: Tuesday, June 01, 2021 03:06 PM

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More  Capacitance Switches    Fluid Level Monitor

Low Value Capacitance Meter

This circuit was originally designed to measure the volume of fluid inside a medical syringe.   As designed , it produces a zero to 5 volt output, corresponding to a capacitance change of about 10 picofarads.  With a digital voltmeter, at its output, it can resolve a capacitance change of 0.002 picofarads or 2 femtofarads.

Click on Circuit Below to view PDF of Schematic

Low Valud Capacitance Meter, David Johnson, Dec 12, 2004

More  Capacitance Switches   
Fluid Level Monitor

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