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Preferably with a LCR meter. If you don't have it, apply a low AC voltage and measure voltage and current and calculate the
inductance. If the impedance isn't mostly reactive, you can use a series resistor and determine the complex impedance from the
three voltage measurements (can be solved geometrically).
When your iron core inductor has no air gap, inductance depends on AC current through the inductor. When inductance is critical, best is to measure it under similar conditions as when it is in the actual circuit.
when using an oscilloscope and also measure current (voltage across a small series resistor), you can also assess the losses and non-linear effects.
When measuring large inductances with reasonable current, keep in mind the EMF generated during current interruption can be large (electric shock, damage to equipment).
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