[Boatanchors] Measuring Swinging Choke values

[J. Forster]

Shorted turns?

Try a simple setup of a few volt AC supply (filament transfoirmer) and a
couple of hundred ohm resisator in series. Measure the voltages around the
loop and calculate a rough L for the choke.

If you have the stuff, cobble up a simple AC bridge is another way to go.

-John

============


> On the swingers I have,  all measure good for DC resistance;  no shorts to
> ground etc.
>
> 73 Mark K3MSB
>
> On Wed, Jul 21, 2010 at 10:26 PM, J. Forster <jfor at quik.com> wrote:
>
>> Are you sure the choke is good?
>>
>> -John
>>
>> ============
>>
>>
>> > I’m using a 6 H smoothing choke as my reference.   When I use a 12 H
>> > smoothing choke for the “test choke”,  the IT-28 gives me a pretty
>> > accurate
>> > reading.
>> >
>> >
>> >
>> > One swinging choke I have is a Collins Swinging Filter Reactor,  12H
>> to
>> 4H
>> > @
>> > 0.3A
>> >
>> >  The measured DC resistance is 65 ohms.
>> >
>> >
>> >
>> > With the IT-28 set to a low bridge voltage (3V),  the current through
>> the
>> > choke will be about 46 mA;   I would expect the inductance to be near
>> 12H
>> > for that current.
>> >
>> >
>> > 73 Mark K3MSB
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