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Measuring Inductance

Donald L Burdette says:

Someone recently asked how to measure inductance. Obviously, the best way is to have an inductance bridge or meter. But since I have neither, here's my favorite way:

Get a sine wave oscillator, and put the inductor and a resistor in series across the output. I generally start with about 100 ohms. Adjust the oscillator frequency until the voltage across the inductor and the resistor is equal. Since they are 90 degrees out of phase, each will be 0.707 times the oscillator voltage. At this frequency, the inductor has an impedance of 100 ohms, and the inductance can be calculated from Z = 2 * pi * f * L.



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