According to this link cm would mean "Molded Case" as opposed to "Dipped
Case" style.

http://xtronics.com/kits/ccode.htm

while here I cm of capacitance is 1.11pF

http://www.du.edu/~jcalvert/phys/caps.htm

I guess it would depend upon whether the schematic in question had no
Farad rating along with the letters CM and whether the CM had a number
with it.

> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On
Behalf
> Of Peter
> Sent: Monday, February 20, 2006 1:27 PM
> To: Microcontroller discussion list - Public.
> Subject: Re: [EE] Metric units
> 
> 
> 
> On Sun, 19 Feb 2006, Spehro Pefhany wrote:
> 
> >> But what is a 'cm' ? There used to be schematics with 'cm' units on
> >> caps. What is a 'cm' ?
> >
> > It *Italian*?
> 
> No, no. You would have caps in a radio, say tuning cap, of 1000cm. I
> suspect it is close to the pF. One theory I have is that it would be
the
> equivalent plate capacitor with 1mm separation in air (or vacuum), and
> 1cm^2 which is about 0.82pF. Come to think of it, this makes sense.
Once
> upon a time real men made their own capacitors and coils so this would
> have been be a very practical measure for everyday use.
> 
> Peter
> --
> 
> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist


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