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From: John Larkin <jjSNIPlarkin@highNONOlandtechnology.com>
Newsgroups: sci.electronics.design
Subject: Re: Practical resistor accuracy distribution
Date: Fri, 26 Apr 2024 19:38:07 -0700
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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.