[R-390] Capacitor Checkers - useage

[Rodney Bunt]

walter,

The in circuit tester uses the same principle as the Heath C-1 tester.

For checking "shorts" they try and get 60Hz signal (from the mains transformar) to travel through
the capacitor, for small caps this won't happen so there will be no indication, for a short, there
will be a big signal passing through.

Then the other test, is the "open circuit test". For this test a "high frequency signal" is
impressed across the capacitor, if the cap. is open circuit there will be no signal passing
through, if it is "ok" then the high frequency signal will pass normaly, and give an apropriate
indication. A fuzzy edge indication on the display shows leakage, or intermittent behaviour.

Rodney
VK2KTZ


--- Walter Salmaniw <salmaniw@shaw.ca> wrote:
> 
> 
> Fellas, I attended my local hamfest last weekend and picked up a couple of 
> capacitor checkers, to be used during my R390A rebuild.  I'm almost 
> embarassed to say that I paid $2.00 for one and $0.50 for the other.  The 
> first is the Eico 950B, while the other is unknown to me.  It's the 
> Cornell-Dubilier BF-90 Handicheck.  Does anyone have any experience with 
> this one.  How useful is it in repairing boatanchors?  This one says that 
> capacitors may be checked while in circuit, but disconnect from the 
> powerline before attempting to do this.  Comments?  By the way, I found 
> on-line a manual for the Eico, but nothing about the BF-90. 
> Thanks,.........Walt.
> 
> 
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