>> The inductance changes dramatically when DC is present, so that's why I
>> want to measure it with DC present. But if I have it in an inductance
>> bridge, or hook it to an inductance meter, the impedance of whatever I
>> use
>> to put DC current into it is put in parallel so it lowers the reading.
>
> Are you sure you are not just measuring the inductance change you expect?


Hi Alan,

Just attaching a power supply and series resistor are enough to ruin any
meaningful measurement, without turning on the power supply. At the
current level I need to test (8 amps), the series resistor is low value
and influences the reading.

But methods using multiple identical inductors as suggested by others seem
promising and I'll be trying them.

Cheerful regards,

Bob


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