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    ISO 3951-1:2005

    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
    • 발행일 : 2005-04-07
    • 발행기관 : ISO
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상세정보

분야 ISO/TC 69/SC 5 : Acceptance sampling
적용범위

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.

국제분류(ICS)코드 03.120.30 : 통계적 방법의 응용
페이지수 103
Edition 1

이력정보

No. 표준번호 표준명 발행일 상태
1 ISO 3951-1:2022상세보기 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 2022-08-18 표준
2 ISO 3951-1:2013상세보기 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 2013-08-27 구판
3 ISO 3951-1:2005상세보기 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 2005-04-07 구판

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