Re: Capacitance HELP

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Steve Ward <steve.ward@xxxxxxxxx>

Hi Scot,

For small caps using a 3 number code, the first 2 numbers are the
value, and the last is the number of zeros after that value, the
resulting number is in pF.  So if you have 104, thats 100,000pF  or
.1uf.

Im not so sure about the "100k" marking myself.  I havent dealt with
those much, but i have seen a few.

1kV is often the actual DC voltage rating (pretty common on ceramics
to see 1k, 2k or 3k).

Steve

On 1/16/06, Tesla list <tesla@xxxxxxxxxx> wrote:
> Original poster: BunnyKiller <bunikllr@xxxxxxx>
>
> while we are on the subject....
>
> lets see if someone can explain the numeric code on very small (
> physical size) caps....
>
> for example  what is the value of a ceramic cap with     "560"  as
> the only marking on it    or  "100K   1KV"
>
> good thing I have a cap meter  but having to test 30 caps to find the
> one I need is a pain...
> some of the numerics dont even make sence to me from the meter 
reading test...
>
> Scot D
>
>
>
> Tesla list wrote:
>
> >Original poster: "Gerry  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>
> >
> >Hi Al,
> >
> >You got most of it right.
> >
> >f  = farads
> >uf = microfarads (10^-6)
> >nf = nanofarads  (10^-9)
> >pf = picofarads  (10^-12)
> >tf  = themptofarad (10^-15)  used in IC design  (hope spelled right)
> >
> >MFD is also microfarads.  I dont remember ever hearing of
> >capacitance expressed in millifarads so I suspect MF is also
> >microfarads (just not sure on this one).
> >
> >1000 tf = 1 pf
> >1000 pf = 1 nf
> >1000 nf = 1 uf
> >
> >1000000 tf = 1 nf
> >1000000 pf = 1 uf
> >1000000 uf = 1 f
> >
> >Hopes this helps,
> >
> >Gerry R.
> >
>
>
>
>