[sdiy] really basic question .. tolerance

[John L Marshall]

We all agree. I think.


Take care,
John
www.sound-photo.com
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----- 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
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> > clear now?
> sorry, no.
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