Inductance Measurements

Yes. Use an RCL bridge where you can get the same voltage and frequency as operating conditions.

Thanks for the advice, can you direct me to a supplier where i can get one.

Sure. You'll note that spellcheck can't spell RLC CRL LCR. Go here for an outstanding line of instruments. I've been using these since God was a boy. Or buy them on ebay under the old name General Radio. Expect to part with a few shekels, though; they're still prized by old farts like me and we drive the price up. They're worth it.

Ah, you will be the right person to clarify my doubt.i was tasked to design and arrange an iron-cored reactor to act as a load in testing microswitches as per IEC60947-5-1 Annex B which, i suspect came from some standard of USA. It simulates the highly inductive solenoid load that the switch can see in usage,with time constants of ~300ms.The catch came when the reactor was tested for inductance. My client had a range of sophisticated LCR meters, and one had to set the frequency at which one wanted to measure the inductance. i was perplexed, since i had thought, till then, that inductance, like resistance is a fixed parameter for that particular reactor. The accuracy of measurement depended on what was set as the frequency. Resonant frequecy of the reactor was the critical value.

Finally, i took the current-rise curve on an oscilloscope and measured the time-constant, thence the inductance. Whew!

i believe Cletus J Kaiser's book gives a complete explanation, but i have no intention or need to buy it. A small explanation will be good.