Circuit: Low Value Capacitance Meter__ Circuit designed by David A. Johnson, P.E.

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Last Updated on: Saturday, December 23, 2017 03:21 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 Drawing Below to view PDF version of Schematic