Capacitor markings...?

[Keith Rowland]

Joel:  Various issues of the ARRL Handbook will shed light on some of
the various methods of marking capacitors. The fact that there isn't
much room on them does not seem tome an excuse for this confusion. It
takes just as much room to print 102K as it does to print .001--in fact,
more room.  Good luck!  I, too, have resorted to measuring them just to
make sure!

73, Keith

Joel Govostes wrote:
>
> I'd appreciate some clarification on capacitor markings and values.
>
> I thought that, for instance, a marking like "102" would mean 10 x 10^2 pf,
> or 1000 pf.
>
> Now, yesterday I went to a local shop to pick up three capacitors I needed.
>
> One was 100pf, disk ceramic.  When I got home I looked at the marking, and
> it read "100".
>
> A second was also 100 pf, and read "100J".
>
> The other was a silver mica, supposed to be .0022 mf, and it read "222J".
>
> SO, this gets somewhat confusing.  Wouldn't a marking of "100" mean
> 10 x 10^0, = 10 pf?  And would the "222" mean 22 x 10^2 pf = .0022 mf?  I'm
> missing something on the convention here.
>
> Thanks!
> JG
>
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