4. Declaration of conformity and uncertainty of measurement
4.1 Relationship between tolerance and uncertainty
Measurement results are used to declare conformity with specifications. Since all measurement results are subject to doubt or uncertainty, the decisions taken are not certain and carry a risk: the risk of declaring a product to be compliant when it is not, and conversely, the risk of rejecting a compliant product. This situation is inescapable, but industrial life is made up of decisions taken in the face of doubt, and as far as possible we must try to assess the risks taken.
The situation can be summarized on the figure 5 :
in zone 1 conformity is declared;
...
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Declaration of conformity and uncertainty of measurement
References
Standardization
- Normes fondamentales. Métrologie et applications de la statistique. Aide à la démarche pour l'estimation et l'utilisation de l'incertitude des mesures et des résultats d'essais. - FD X 07-021 - octobre 1999
- Spécification géométrique des produits (GPS). Vérification par la mesure des pièces et des équipements de mesure. Partie 1 : règles de décision pour prouver la conformité ou la non-conformité à la spécification....
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