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.
But should the value of Inductivity be different for different frequencies? IF so, then which value of inductivity should be assumed for practical considerations?+
Hello all, I'm a student and want to measure inductance of a solenoid valve. I measured it with L meter and found that it changes with change in frequency of the L meter. Why so and what exact relation inductance has with the frequency?James Newton replies: The formula is given on this page. f is the Frequency. As to the reason, it is simply that the higher the frequency, the more the signal is transmitted. It is transmitted into the air from each point in the wire, and so recieved back into different points along the wire.+
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