BS 6002-2:2007
变量检验用取样程序.根据独立质量特性的逐批检验用验收质量限度(AQL)检索的单次抽样检验方法一般指南

Sampling procedures for inspection by variables - General guide to single sampling plans indexed by acceptance quality limit (AQL) for lot-by-lot inspection of independent quality characteristics

被代替

标准号

BS 6002-2:2007

发布

2007年

发布单位

英国标准学会

替代标准

BS ISO 3951-2:2013

当前最新

BS ISO 3951-2:2013

 

 

适用范围

This British Standard describes an acceptance sampling system primarily designed for use under the following conditions: a) 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; b) where the quality characteristics of the items of product are measurable on a continuous scale; c) where the measurement error is negligible (i.e. with a standard deviation no more than 10% of the corresponding process standard deviation); d) where production is stable (under statistical control) and the quality characteristics are distributed, at least to a close approximation, according to normal distributions; e) where, in the case of multiple quality characteristics, the characteristics are independent, or almost independent, of one another; f) where a contract or standard defines a lower specification limit U, an upper specification limit L, or both on each of the quality characteristics. If there is only one quality characteristic, an item is qualified as conforming if its measured quality characteristic x satisfies the appropriate one of the following inequalities: 1) x W L (i.e. the lower specification limit is not violated); 2) x u U (i.e. the upper specification limit is not violated); 3) x W L and x u U (i.e. neither the lower nor the upper specification limit is violated). If there are two or more, say m, quality characteristics, then, designating the lower and upper limits for the ith quality characteristic by Li and Ui respectively, an item of product is qualified as nonconforming if one or more of its m measured quality characteristics xi fails to satisfy the appropriate one of the following inequalities: 4) xi W Li; 5) xi u Ui; 6) xi W Li and xi u Ui. Inequalities 1), 2), 4) and 5) are called cases with a single specification limit, and 3) and 6) are called cases with double specification limits. For double specification limits, a further distinction is made between combined control, separate control or complex control. If there is only one quality characteristic, then: ? combined control is where a single AQL applies to nonconformity beyond both limits; ? separate control is where separate AQLs apply to nonconformity beyond each of the limits; ? complex control is where one AQL applies to nonconformity beyond the limit that is of greater seriousness, and a larger AQL applies to the total nonconformity beyond both limits. Licensed Copy: Wang Bin, na, Tue Apr 17 02:03:41 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BS 6002-2:2007 6 ? ? BSI 2007 If there are two or more quality characteristics, this generalizes as follows: ? combined control is where nonconformity beyond both limits on a variable belongs to the same class, to which a single AQL applies; ? separate control is where nonconformity beyond the two limits on a variable belongs to separate classes, to each of which a single AQL applies; ? complex control is where nonconformity beyond the limit that is of greater seriousness belongs to one class to which a single AQL applies, and the total nonconformity beyond both limits belongs to another class to which a larger AQL applies. Note that, in the case of two or more quality characteristics, nonconformity on more than one quality characteristic may belong to the same class

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