[R-390] Advice - Proper Use of Meggers

[Cecil Acuff]

The use of a hand cranked meggar was outlined in one of Chuck Rippel's
videos on radio restoration...can't remember if it was the SP-600 video or
the R-390..not important....It worked very well.

Don't remember the specifics...

Cecil....
----- Original Message ----- 
From: "rbethman" <rbethman@comcast.net>
To: "Leigh Sedgwick" <bipi@comcast.net>
Cc: <r-390@mailman.qth.net>
Sent: Saturday, February 07, 2004 10:56 AM
Subject: Re: [R-390] Advice - Proper Use of Meggers


> Mike,
>
>     These are used normally to test high voltage cables, transformers,,
> and generator windings.
>
>     I don't believe that testing capacitors is recommended.
>
> Bob - N0DGN
>
> Leigh Sedgwick wrote:
>
> >I recently picked up a megger but, honestly, I don't know
> >much about them.  They are apparently great for checking
> >leakage through caps which is the main reason I bought it.
> >
> >For the record, it is a old Navy unit made by Winslow
> >Teletronics, Inc., Model ZM-63/PSM-35 with a Navy
> >designation of AN/PSM-35.  It measures Megohms resistance at
> >500V.
> >
> >I notice that I can vary the output voltage by rotating the
> >crank at a slower speed but the readings fluctuate.  So I
> >take it, that the proper use requires rotating the crank at
> >normal speed and full-voltage output?  While 500V is fine
> >for some caps, it typically exceeds some of the smaller caps
> >found in receiver boat anchor receivers.  So, does one need
> >a smaller unit for lower voltage caps to get reliable
> >readings.
> >
> >Sorry for my ignorance on the subject, I've just never used
> >one of these.  Can someone shed some light on this subject
> >for me or point me at a reference for their proper use.  Any
> >manuals available for this animal?
> >
> >BTW, just finished tearing apart my RF deck and cleaning all
> >the gears.  I found that even a clean looking unit like mine
> >was before I started, should be rebuilt...many gears were
> >stuck together from hardening of the lubrication oil even
> >though they looked quite good to the naked "eye".  I'm
> >looking forward to experiencing the "smooth" action of an
> >R-390A.
> >
> >Hey thanks all...
> >
> >73 de Mike
> >K7PI
> >Mercer Island, WA
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> >
> >
> >
>
> -- 
> <                      Bob Bethman - N0DGN
> +-------------------------------+----------------------------------+
> | N0DGN AMRadio Manassas, VA    |          Home Builder            |
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