Path: ...!Xl.tags.giganews.com!local-1.nntp.ord.giganews.com!news.giganews.com.POSTED!not-for-mail NNTP-Posting-Date: Sat, 27 Apr 2024 20:47:29 +0000 From: Joe Gwinn Newsgroups: sci.electronics.design Subject: Re: Practical resistor accuracy distribution Date: Sat, 27 Apr 2024 16:47:29 -0400 Message-ID: <00pq2jh2o2ru6qqlp4bs79f4bn5s95agu7@4ax.com> References: User-Agent: ForteAgent/8.00.32.1272 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Lines: 42 X-Usenet-Provider: http://www.giganews.com X-Trace: sv3-7hO3lr4Xl/2Dkw/jKRQLKUcmaLpk5aLFEwR+HYWDfBLabJV2JklRePyFODgIldAHwlS2tB+XHIuuXd0!nE86CG4P36k63jvohY06AGAJdaor6SathAbFPQg46eO/R+MC5fbB9yTQP75qYoLiY2HbCZI= X-Complaints-To: abuse@giganews.com X-DMCA-Notifications: http://www.giganews.com/info/dmca.html X-Abuse-and-DMCA-Info: Please be sure to forward a copy of ALL headers X-Abuse-and-DMCA-Info: Otherwise we will be unable to process your complaint properly X-Postfilter: 1.3.40 Bytes: 2552 On Fri, 26 Apr 2024 19:38:07 -0700, John Larkin wrote: >On Fri, 26 Apr 2024 20:16:48 -0400, Joe Gwinn >wrote: > >>On Sat, 27 Apr 2024 00:54:41 +0200, Klaus Vestergaard Kragelund >> 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: >>> >>> >>> >>> >>> >>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. Also possible, and maybe a combination of both? But the fundamental point is that one must measure to be sure, unless one is a large enough customer that the manufacturer will simply tell you. Joe Gwinn