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

posted 22 March 2001 03:15 AM               

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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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Posts: 4119
From:West Chester, OH, USA
Registered:

posted 22 March 2001 08:33 AM               

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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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posted 31 March 2001 10:08 AM              

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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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