Circuit - Low Value Capacitance Meter - Circuits designed by David A. Johnson, P.E.

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Circuits designed by David Johnson, P.E.

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Last Updated on: 06/18/2009 07:56:41 AM

Capacitance Switches Fluid Level Monitor

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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.