What is 3.4 per million?
Article Abstract:
The quality characteristic can be measured as a normal distribution with mean (mu) and standard deviation (sigma) and the actual value of 3.4 parts per million (ppm) refers to the fraction that would fall either above mean (mu) plusmn 4.5 standard deviation (sigma). It also states that there is no rational place for 3.4 ppm in a Six Sigma world for the need of processing improvement is more compelling than the need to correct value that have only a secondary role in such improvement.
Publication Name: Quality Progress
Subject: Engineering and manufacturing industries
ISSN: 0033-524X
Year: 2004
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New uncertainty method is taking hold: Refinements to traditional approach
Article Abstract:
ISO 9000 quality system standards requires the traceability of calibrations of measuring equipment used for quality, along with a basic understanding of uncertainty stating. The 'Guide to the Expression of Uncertainty in Measurement' (GUM) was published in 1993 as a refinement to the traditional approach to metrology. An overview of the guide is included.
Publication Name: Quality Progress
Subject: Engineering and manufacturing industries
ISSN: 0033-524X
Year: 1999
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