[Milsurplus] hi volt choke testing questions

[Mike Morrow]

Patrick wrote:

>I checked the inductance by putting a 5K resistor in series with
>it and a 20VAC power supply, adjusting the pot till the choke and
>resistor each had the same voltage across them, and then measured
>the resistance of the pot, substituted that for the reactive
>impedance of the choke, and came up with 43H.


Hi Patrick,

43 Henries seems very large, particularly for something that can handle 300
mA.

The inductive reactance at 60 Hz of 43 H would be 2 x pi x 60 x 43 = 16210
ohms.  How did you test this with only a 5000 ohm variable resistor in your
setup?

I think there's an error in there somewhere.  Perhaps by a factor of 2 x pi?

73,
Mike / KK5F