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  • ISO
    ISO 3951-1:2022 Sampling procedures for inspection by variables - Part 1: Specification for single sampling plans indexed by acceptance quality limit (AQL) for lot-by-lot inspection for a single quality characteristic and a single AQL
    Edition: 2022
    $564.82
    / user per year

Content Description

This document specifies single sampling plans for lot-by-lot inspection under the following conditions:

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

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

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

d) where a contract or standard defines a lower specification limit, L, an upper specification limit, U, or both. An item is qualified as conforming if its measured quality characteristic, x, satisfies as appropriate one of the following inequalities:

1)    x   L (i.e. the lower specification limit is not violated);

2)    x   U (i.e. the upper specification limit is not violated);

3)    x   L and x   U (i.e. neither the lower nor the upper specification limit is violated).

Inequalities 1) and 2) are cases with a single specification limit, and 3) is a case with double specification limits.

Where double specification limits apply, it is assumed in this document that conformity 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 a product outside the two specification limits. This is referred to as combined control.



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About ISO

ISO, the International Organization for Standardization, brings global experts together to agree on the best way of doing things – for anything from making a product to managing a process. As one of the oldest non-governmental international organizations, ISO has enabled trade and cooperation between people and companies all over the world since 1946. The International Standards published by ISO serve to make lives easier, safer and better.
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