[AMRadio] Transformer


crawfish crawfish at surfmore.net
Fri Feb 2 18:46:29 EST 2007


Megger is an acronym(actually someone patented the name) of a megohmmeter.
That will find your voltage breakdown problems. One of these days, I need to
go get a 30 kV model someone offered me.
                                      Joe W4AAB
----- Original Message -----
From: "Alan Beck" <abeck at xplornet.com>
To: "Discussion of AM Radio in the Amateur Service"
<amradio at mailman.qth.net>
Sent: Friday, February 02, 2007 12:06 PM
Subject: Re: [AMRadio] Transformer


> Hi, I seem to remember that there was something called a megger in school.
>
> Was that something that tests using high voltage tests in an effort to
> see if it will breakdown?
>
> I remember what a Variac does, you can use it to bring an old radio to
> life by starting at a low voltage and increasing to operating voltage,
> it is supposed to rejuvenate the caps.
>
> Alan
>
>
> W4AWM at aol.com wrote:
> > Hi Rick,
> >
> > If you have access to a megger, that is one way to find out for sure,
but if
> > you are getting those readings on an ohmmeter, I am afraid you have a
problem.
> >
> > Baking it may help, but the problem is that the wire in the primary and
> > secondary is  insulated and leakage indicates that the insulation has
broken down
> > which is why you are seeing anything other infinity on the meter.
Depending on
> > how the leads are brought out, there is the possibility that there is a
> > breakdown on the terminal board if there is one.  If the leads come out
of the
> > windings out of the tranny housing as pigtails, the problem is internal.
> >
> > Hope this helps.
> >
> >  73,
> >
> > John,  W4AWM
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