[sdiy] really basic question .. tolerance

[harrybissell]

Yep... I'm in

H^) harry

John L Marshall wrote:

> We all agree. I think.
>
> Take care,
> John
> www.sound-photo.com
> ---------------------------------------------------------------------------
>
> ----- Original Message -----
> From: "diysynth" <diy_list at analog-synth.de>
> To: <synth-diy at dropmix.xs4all.nl>
> Sent: Saturday, January 18, 2003 3:08 PM
> Subject: Re: [sdiy] really basic question .. tolerance
>
> > Hi all, hi Tim,
> >
> > > Rules... We don't need no stinkin' rules!
> > Oooh Yes we do....
> >
> > 100 KOhm with 1 %
> >
> > to simplify, we have (with 1% tolerance) 99, 100 and 101 KOhm.
> > With 3 possibilities in a 2-combination :
> > 9 Possible Combinations:
> >
> > 99 + 99 = 198  instead of 200 (i.e. 1% error)
> > 99 + 100 = 199 (0,5%)
> > 99 + 101 =200 (0%)
> > 100 + 99 = 199 (0,5%)
> > 100 + 100 = 200 (0%)
> > 100 + 101 = 201 (0,5%)
> > 101 + 99 = 200 (0%)
> > 101 + 100 = 201 (0,5%)
> > 101 + 101 = 202 (1%)
> >
> > so, we have a arithmetic mean of tolerances of :
> > (1,0 + 0,5 + 0 + 0,5 + 0 +0,5 + 0 + 0,5 + 1) / 9 = 0,4444 %
> >
> > That is, of course, better than 1%.
> > This estimation doesnt take into account, that 1% tolerance means, that
> > there is a gauss-distribution of the resistor values with a standard
> > deviation around 100 KOhm of  (less than) 1 KOhm or so. Tis would increase
> > this e-mail to some hundred lines.
> >
> > Joerg
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > > clear now?
> > sorry, no.
> >
> >
> >
> >