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  ISO 9001/4:2000
  measurement uncertainty

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Author Topic:   measurement uncertainty
romelnar
Forum Contributor

Posts: 15
From:alabang, philippines
Registered: Mar 2001

posted 22 March 2001 03:15 AM     Click Here to See the Profile for romelnar   Click Here to Email romelnar     Edit/Delete Message   Reply w/Quote
i've been tryin to locate the word "measurement uncertainty" in the iso9k2k and i cannot find one.

if it really is not there, what was the reason for its deletion? is it still required in this new revision?

anybody? thanks.

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Marc Smith
Cheech Wizard

Posts: 4119
From:West Chester, OH, USA
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posted 22 March 2001 08:33 AM     Click Here to See the Profile for Marc Smith   Click Here to Email Marc Smith     Edit/Delete Message   Reply w/Quote
ISO 9001:2000 does not specifically address measurement uncertainty, but as with QS-9000 there is an expectation that you understand measurement systems and account for measurement uncertainty 'where appropriate'.

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Ed
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posted 31 March 2001 10:08 AM           Edit/Delete Message   Reply w/Quote
In the old standard, the phrase "measurement uncertainty is known" could have and probably has driven some companies to calculate mesurement uncertainty for all devices (usually in the form of Gage R&R). The real world is dominated by over selection of instrument capabilities. For example, choosing an instrument that can resolved one more decimal place than the tolerance applied to the specification - otherwise known as the 10:1 rule. In that case, the measurement uncertainty isn't known exactly, however, the capability is known to exceed the need. In ISO 9001:2000, the governing words are "ensure valid results". The result is much less confusion and unnecessary work.

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