Re: Strange Numbers

From: Borek (borek_at_parts.bpp.to.com.remove.pl)
Date: 01/22/05


Date: Sat, 22 Jan 2005 12:01:29 +0100

On Sat, 22 Jan 2005 02:10:57 -0600, Richard J Kinch <kinch@truetex.com>
wrote:

> You miss the point. A resistor with, say, a 1K ohm nominal value, and a
> 5pct tolerance, will almost certainly be nearer to 1050 ohms or 950 ohms
> instead of near 1000 ohms. They are selected to be on the edge of
> tolerance, not a normal distribution.

I think that's the other problem. What you are buying as 5 pct tolerance
resistor is what was left after 1 pct, 0.1 pct and so on was selected,
so the distribution curve looks like a two-humped camel. Hydrochloric
acid bottles are not sorted this way so the ditribution is much closer
to normal.

Best,
Borek



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