Re: MMC

• To: tesla-at-pupman-dot-com
• Subject: Re: MMC
• From: "Malcolm Watts" <malcolm.watts-at-wnp.ac.nz> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Sun, 06 Feb 2000 16:36:51 -0700
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

Hi Herwig, all,


> Original Poster: "Herwig Roscher" <herwig.roscher-at-gmx.de> 
> 
> 
> Hi coilers,
> 
> After having assembled my new MMC I checked out the capacity 
> of each string in order to monitor possible changes in the future. 16 
> caps 100 nF connected in series (each of them paralelled by a 10 
> MOhm bleeder) resulted in 7.0 nF. Strange, because the caps are 
> tolerated +- 5%. I checked a single cap and the meter showed 150 
> nF. I disconnected the bleeder and found the capacity to be 100 
> nF. Correct! I used other type of meters and got different results.
> 
> Obviously the measured capacitance is dependent on the value of 
> the bleeder and the meter's measuring method. So watch out!

I ran into exactly the same problem when measuring some I built last 
year. In the end, I resorted to resonating the finished articles with a 
known inductance to derive their value.

Regards,
Malcolm 

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