Peter and Vic,
According to the HD-1250 Heath GDO manual, for measuring an unknown
inductor I quote;
(1) Connect a low value capacitor across the unknown inductor; for example
100 pF.
(2) Use the dip meter in the injection mode.
(3) By trial and error, find a coil that will dip on the resonant frequency of
the
'parallel' circuit. Record the frequency.
(4) Compute the inductance of the coil with the following formula:
L = 1 / 39.48 x f^2 x C
Un-quote.
I think Ian wondered about a good book on these, I would recommend this
manual as it has a ton of info. It's at Bama for any wanting to download it.
Best,
Will
*********** REPLY SEPARATOR ***********
On 8/6/06 at 11:48 PM Peter Chadwick wrote:
>Vic wrote:
>>Let's say I take a coil and connect a capacitor across it. If I couple
>RF into the coil from my GDO, I think you'll agree that it's a parallel
>circuit.<
>No. The current induced in the coil is in series with the coil. So the
>whole thing is a series resonant circuit. Or Kirchoff is wrong.
>73
>Peter G3RZP
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