[Test-Equipment] Question about series/parallel capacitors

Barry n4buq at knology.net
Fri May 13 22:15:52 EDT 2011


> If the capacitors were perfect (zero leakage), the two are equal.
> 
> With real capacitors, option A with a bleeder string to equalize the
> capacitor voltages would be preferable.
> 
> Why don't you buy a single cap to do the job and save a bunch of
> trouble.
> -John
> 

This is an attempt to replace a "standard capacitor" in a General Radio Model 1617A capacitance bridge.  The original capacitor shorted.  I found some 0.5uF, 0.5% caps that are rated at 250V so I figured making an array out of nine of them would get me 0.5uF at 750V at 0.5% (or hopefully better).

I think adding bleeder resistors would upset the balance in this application, right?

I have my sights set on a true GR standard capacitor (a 1409-X); however, I think at best it's only rated at 500V and this bridge can develop 600V of bias so I'm not sure I can use that as a replacement.  I do plan to use it to check the accuracy of my home-made standard.

Thanks!
Barry - N4BUQ



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