Re: cheap way to test "doorknob" capacitors? (fwd)

[<sroys@xxxxxxxxxxxxxxxxx>]

---------- Forwarded message ----------
Date: Tue, 9 Nov 2004 16:40:28 -0600
From: Steve Ward <steve.ward@xxxxxxxxx>
To: High Voltage list <hvlist@xxxxxxxxxx>
Subject: Re: cheap way to test "doorknob" capacitors? (fwd)

Hey,

Im new to the list, but been on the TCML and into HV for years now.

I too just bought a bunch of used doorknobs.  I performed several
tests to make sure they are working.  First was to simply measure
their capacitance.  Second was to apply AC from a NST across them (no
spark gap).  I then tested one to extreme voltages with my CW...
tested 30kv caps to 50kv+.  They held up fine, just that eventually it
arced around the entire capacitor with a loud bang ;-).

Anyway, i think the best test is to get a low current HV DC power
supply and charge them up to their rated voltage, let them sit for
awhile, then discharge them to see how much voltage was left on them
(this will give you an idea of how leaky they might be).

Steve Ward


On Tue, 9 Nov 2004 14:24:34 -0700 (MST), High Voltage list
<hvlist@xxxxxxxxxx> wrote:
> Original poster: <sroys@xxxxxxxxxxxxxxxxx>
> 
> ---------- Forwarded message ----------
> Date: Tue, 9 Nov 2004 06:25:18 -0700
> From: Graham Christensen <voltage@xxxxxxxxx>
> To: High Voltage list <hvlist@xxxxxxxxxx>
> Subject: Re: cheap way to test "doorknob" capacitors? (fwd)
> 
> Just hook them up to a nst or obit and put a spark gap in parallel with
> them. If it gives off a very loud and very bright spark, then they're
> working. :-)
> 
> Graham
> 
> ----- Original Message -----
> From: "High Voltage list" <hvlist@xxxxxxxxxx>
> To: "hvlist" <hvlist@xxxxxxxxxxxxxxxxx>
> Sent: Monday, November 08, 2004 3:05 PM
> Subject: cheap way to test "doorknob" capacitors? (fwd)
> 
> > Original poster: <sroys@xxxxxxxxxxxxxxxxx>
> >
> >
> >
> > ---------- Forwarded message ----------
> > Date: Mon, 8 Nov 2004 00:08:42 -0500
> > From: Jack Vandam <snotoir7674g@xxxxxxxxxxxxxx>
> > To: High Voltage list <hvlist@xxxxxxxxxx>
> > Subject: cheap way to test "doorknob" capacitors?
> >
> > I have just come across an assortment of used doorknob capacitors.  Since
> I
> > don't know whether or not they work, I would like to test them.  What
> would
> > be a simple way of doing this?
> >
> > Thanks,
> > Jack
> >
> >
> >
> 
>