Date: Fri, 29 Dec 2000 14:31:56 -0800 From: Jan Johansen To: Greg Gogates Subject: Re: Uncertainty vs Tolerance Dave, a)common -- perhaps more than we know b)expected -- not from the customers viewpoint c)allowed -- sticky subject. 17025 Para 5.5 relating to equipment has a couple of statements 5.5.1 "...equipment required for the correct performance..." 5.5.2 " Equipment ... shall be capable or achieving the accuracy required..." Can you calibrate a Fluke 5700 with a Fluke 8060A as long as you know the uncertainty of measurement? Yes, but not for long. Kind of like being ISO9000 registered to make concrete life vests. Happy Holidays Jan Johansen JJ Calibrations, Inc. janj@jjcalibrations.com -----Original Message----- From: Greg Gogates To: iso25@quality.org Date: Wednesday, December 27, 2000 2:33 PM Subject: Uncertainty vs Tolerance >Date: Wed, 27 Dec 2000 14:56:30 -0500 >From: David Collins >To: iso25@fasor.com >Subject: Uncertainty vs Tolerance > >Greeting and Happy Holidays > >I have been reviewing the uncertainties claimed by some calibration >laboratories and have come across several situations where the listed >uncertainty either is, or could be greater than the tolerance of the gage. >Is this (a) common, (b) to be expected, or (c) even allowed? > >David Collins >Quality Engineer > >Quality Techniques, Inc. >11145 Luschek Drive. >Cincinnati, Ohio 45241 >Email: collindv@hotmail.com