[Test-Equipment] Sprague TO-6A question

[wa5cab at cs.com]

I once had and used a TO-6A before replacing it with a ZM-3A.  I have a PDF 
of the TO-6 manual which says that the Insulation-Resistance range for 
capacitors rated 150 VDC and higher is 500 Meg Ohms to 50 Kilo Meg Ohms (50 Giga 
Ohms).  A chart of minimum allowable I-R in the manual says that for 
capacitors of 0.1 ufd and smaller, the minimum is 5000 Meg Ohms for new 
capacitors.  It doesn't list minimum values for 45 year old capacitors.  :-)  However, 
I would tend to be suspicious of a reading all the way at the high end of 
the range.  I have once in a while found capacitors that were just open.

In a message dated 1/22/2010 4:48:14 PM Central Standard Time, 
Esrman at ameritech.net writes: 
> If you mean 50k with a vtvm or vom,that thing was leaking like a sieve!
> 
> I want that cap please?
> 
> I`m repairing a cap checker and don`t have a leaky cap.
> 
> Anyone have a shorted Electrolytic I could have?
> 
> 50k means 50,000 ohms.
> 
> ----- Original Message ----- 
> From: "Ken Kaplan" <krkaplan at cox.net>
> To: "Discussion of Electronic Test Equipment" 
> <test-equipment at mailman.qth.net>
> Sent: Friday, January 22, 2010 3:37 PM
> Subject: Re: [Test-Equipment] Sprague TO-6A question
> 
> 
> >Yes, I checked the old C16. It measures 50K which I think means 50K
> >megohms or 50 gigohms. Seems like enough but I guess not for the
> >circuit. The new replacement indicates infinity. I know the other tests
> >are not of much value but I wanted to gather as much info as I could. My
> >new replacements are Mallory metalized polyester. You think polyethylene
> >film would be better?
> >
> >Ken
> 

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