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9 Feb 2012

This is a simple inductor and capacitor measurement tool. The part to test is connected to an oscillator circuit, and the frequency of oscillation corresponds to the value of the capacitor – [via]

All I do is use the LM311 square wave output as pulses to a 16bit counter, and another 100mS periodic timer to count how many pulses per 100mS interval, to calculate the oscillation frequency. BTW, the PIC32 is running off a 16MHz crystal. I average the results from 5 consecutive readings, so I have a 0.5second measurement repeat rate. Good enough. It seems to be accurate enough for my needs, which is basically identifying components that I salvage, or coils that I wind myself.

LM311 oscillator based LC meter - [Link]

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