[Milsurplus] hi volt choke testing questions

[D C Macdonald]

Doesn't the gap indicate that it  IS  a swinging choke?
It's been a long time since I went though Air Force
tech school, so my memory is a bit sloppy.

I believe if it is not a swinger, the inductance should
be the same regardless of current unless the core
goes into saturation due to overcurrent.

As best as I can remember, inductance is simply a
factor of physical properties, just as capacitance is.

Your method of testing to determine the inductance
sounds valid to me.  I remember having done just that
in labs at Air Force Tech School.

Mac, K2GKK/5



----Original Message Follows----
From: Patrick Jankowiak <recycler at swbell.net>
To: milsurplus at mailman.qth.net
Subject: [Milsurplus] hi volt choke testing questions
Date: Sun, 18 Jul 2004 21:51:26 -0500

Anyone have a quick and dirty way to test a power supply
choke's inductance while running some current through it?

I have a weighty 95 ohm one that is 43H with no current.
Like to know how much with 200-500mA.  It has a gap,
so I am pretty sure it's not a swinger, but I doubt it could
still be 43H at 300mA.

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.

Unfortunately I see no way to pass DC through the choke and
also hook up this AC power supply to it.  Maybe in series?

PJ