ISO 3951-1:2005
Règles d'échantillonnage pour les contrôles par mesures — Partie 1: Spécifications pour les plans d'échantillonnage simples indexés d'après la limite d'acceptation de qualité (LAQ) pour le contrôle lot par lot pour une caractéristique de qualité unique et une LAQ unique
Numéro de référence
ISO 3951-1:2005
Edition 1
ISO 3951-1:2005
Annulée (Edition 1, 2005)


ISO 3951-1:2005 specifies an acceptance sampling system of single sampling plans for inspection by variables, in which the acceptability of a lot is implicitly determined from an estimate of the percentage of nonconforming items in the process, based on a random sample of items from the lot.

ISO 3951-1:2005 is primarily designed for application under the following conditions:

where the inspection procedure is to be applied to a continuing series of lots of discrete products all supplied by one producer using one production process;

where only a single quality characteristic x of these products is taken into consideration, which must be measurable on a continuous scale;

where the measurement error is negligible, i.e. with a standard deviation no more than 10% of the process standard deviation;

where production is stable (under statistical control) and the quality characteristic x is distributed according to a normal distribution or a close approximation to the normal distribution;

where a contract or standard defines an upper specification limit U, a lower specification limit L, or both;

an item is qualified as conforming if and only if its measured quality characteristic x satisfies the appropriate one of the following inequalities:

x greater than or equal to L (i.e. the lower specification limit is not violated);

x less than or equal to U (i.e. the upper specification limit is not violated);

x greater than or equal to L and x less than or equal to U (i.e. neither the lower nor the upper specification limit is violated).

The first two inequalities are called cases with a single specification limit, and the third a case with double specification limits.

If double specification limits apply, it is assumed in ISO 3951-1:2005 that conformance to both specification limits is equally important to the integrity of the product; in such cases it is appropriate to apply a single AQL to the combined percentage of product outside the two specification limits. This is referred to as combined control.

Informations générales

  •  : Annulée
     : 2005-04
    : Annulation de la Norme internationale [95.99]
  •  : 1
  • ISO/TC 69/SC 5
  • RSS mises à jour

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