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Re: Vacuum pump for capacitor pumpdown



If I had time, I'd tell more.
But go here, it's the best source of vacuum information you're gonna find.
http://www.tiac-dot-net/users/shansen/belljar/
It's The Bell Jar.  enjoy.

-----Original Message-----
From: Tesla List <tesla-at-pupman-dot-com>
To: tesla-at-pupman-dot-com <tesla-at-pupman-dot-com>
Date: Friday, August 28, 1998 7:44 PM
Subject: Vacuum pump for capacitor pumpdown


>Original Poster: Gary Lau  28-Aug-1998 0833 <lau-at-hdecad.ENET.dec-dot-com> 
>
>Hi All:
>
>I'm slowly progressing with the construction of my new extended foil,
>rolled poly caps.  The rolling is done, I now just have to complete the
>enclosure.  My problem is how to draw the vacuum before backfilling with
>oil.  I have a vacuum pump that I can borrow, a rotary vane unit.  The
>specs say it should be able to pull a 26" Hg vacuum, although the gauge
>only reads 22-23", could be that the fittings just need to be tightened.
>
>Is there a consensus on what degree of vacuum is required for cap pumpdown
>prior to oil filling?  Also, I've read descriptions of the pumpdown/fill
>procedure, describing how the oil will foam or boil as it is introduced.
>Could this be minimized by either heating the oil in a pot on a stove, or
>by storing the oil in an evacuated container for some time, to cause
>outgassing prior to use?
>
>Regards, Gary Lau
>Waltham, MA USA
>
>
>