Re: Practical resistor accuracy distribution

On Fri, 26 Apr 2024 20:16:48 -0400, Joe Gwinn <joegwinn@comcast.net>
wrote:

On Sat, 27 Apr 2024 00:54:41 +0200, Klaus Vestergaard Kragelund
<klauskvik@hotmail.com> wrote:
>

Hi
>
I needed to look into distribution of accuracy of resistors.
>
Vendors don't have any info, but luckily some nice people online have
done measurements:
>
<https://www.eevblog.com/forum/projects/smd-resistor-distributions/>
>
<https://lambdafox.com/resistor-tolerances/>
>

The thing to be aware of is that resistor value distributions are
often wildly non-Gaussian.  The classic example is where there are
grades, say 1%, 5%, and 20%.  The 5% group will often have a hole that
happens to match the 1% distribution perfectly.
>
A lot of modern resistors are made with a relatively wide
distribution, and then machine-sorted into bins.  In this case, many
of the bins will have uniform distributions.  And so on.
>
Joe Gwinn

I suspect that they may laser trimmed and shipped, not binned.

One batch on a reel could be very close to one another.