In this post, I’ll show you how to measure the value of capacitors and inductors with your oscilloscope and waveform generator.
To measure the capacitor we’ll simply which will charge(periodically with a square wave) it through a resistor and measure how much time it takes the capacitor to charge to 63% we can then calculate its value according to the RC time constant formula which is t = RC. We’ll rearrange it to C = t/R to get out the capacitance.
To measure the inductor we’ll need to make an LC tank circuit. The rising edge of the square wave signal will cause it to ring. Then we can measure the frequency of the ringing which we can input into the LC tank formula L = 1/sqrt((2*Pi*f))*C and calculate the inductance.