Capacitance Measurement With Oscilloscope

by Himmel   Last Updated July 18, 2018 13:25 PM

schematic

simulate this circuit – Schematic created using CircuitLab

I'm trying to determine the capacitance of a sensor, but the oscilloscope's internal capacitance is loading the measurement too much.

What is an appropriate method to determine a low picofarad capacitance using an o'scope in this situation? (o'scope internal capacitance is 24pF).



Answers 1


Make a measurement of 'nothing', that is your scope's input capacitance. Then make a measurement of the 'sensor', that is your scope's input capacitance + the sensor's capacitance. Subtract.

Neil_UK
Neil_UK
July 18, 2018 13:01 PM

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