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From: jk3k+@andrew.cmu.edu (Joe Keane)
Newsgroups: sci.electronics
Subject: Re: Inductance Measurement (Big V)
Message-ID: <0ZFW62y00XcRM3bGAl@andrew.cmu.edu>
Date: 25 Oct 89 21:11:30 GMT
References: <9450@pyr.gatech.EDU>
Distribution: usa
Organization: Mathematics, Carnegie Mellon, Pittsburgh, PA
Lines: 12
In-Reply-To: <9450@pyr.gatech.EDU>

As long as the magnetic field in the inductor is weak, inductance
shouldn't change much with voltage.  You may be OK just using the value
from a lower voltage.

What i'd do is to put the inductor in series with a small resistor, the
value depending on what frequency you're using.  Hook them up to a
sinusoidal source at the voltage and frequency you're interested in. 
Then look at the voltages across both on a scope, making sure you don't
ground something that isn't.  Given the ratio and phase angle between
the two voltages, you can figure out both the inductance and resistance
of your inductor at the given voltage and frequency.  I assume of course
that the capacitance is negligible.