[Test-Equipment] How to get a capacitor standard calibrated/validated/verified?

[Bill Fuqua]

   A GDO is not accurate enough for a percent or better measurement.
Also, it would have to be a very low frequency with such a large value of 
capacitance.
Otherwise the Q would be too low to find the resonance.
   73
Bill wa4lav

At 03:19 PM 11/1/2011 -0400, Ron Youvan wrote:
>Barry N4BUQ wrote:
>
> > I have a General Radio 1409-X (0.5uF) capacitor standard for which I 
> would like to know how close to 0.5uF it really is.  How would one go 
> about getting this done?  It's not exactly a "calibration" procedure as 
> much as it just a "check" but I assume a cal lab would do that.  Anyone 
> know where I could get this done and approximately how much it would cost?
>
> > Note that this is for personal/hobby use and does not have to be NIST 
> traced, etc.  I'm trying to repair my GR1617A whose standard capacitor 
> failed.  I have a temporary "standard" I made that's close but I'm 
> wanting to make something a bit better.  I'm wanting to use my 1409-X as 
> a comparison cap to trim the new standard capacitor but don't know just 
> how close my "standard" is to 0.5uF.
>
>    Look into buying a new silver mica or polypropylene capacitor rated 
> .1% (or better) instead and
>calibrate your "C" meter with it and then look at your suspect standard.
>--
>     Ron  KA4INM -    Ron  KA4INM - Did you know ...
>                      ... that no-one ever reads these things?
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