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X07-039 : new standard AFNOR

The new booklet X07-039 has just been published by AFNOR.

Entitled Role of Uncertainty in conformity assessment - Implementation of ISO/CEI Guide 98-4 - Illustration through industrial case studies, this document, in which ACEI participated, incorporates the principles set out in the 98-4 standard, and then provides many illustrative examples.

 As a reminder, the standard ISO/CEI Guide 98-4, and now the booklet X07-039, bring new concepts in the world of metrology :

  • the uncertainty is not distributed around the measured value but around the true value.
  • the value given in the certificate of calibration is not necessary the most likely. It's thus possible, on the basis of an a priori  knowledge, to revise the calibration result in order to get as close as possible to the true value, using the Bayes theorem.
  • the assessment of specific and global riks.
  • the determination of risk-related guard bands.

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