变量检验用取样程序.逐批检验用合格质量等级(AQL)标注的双取样方案指南

标准编号：BS 6002-3-2005

提出单位：BSI

起草单位：BSI

发布单位：BSI

发布日期：2005年

实施日期：20050331

主      题：质量保证 检验 验收检验 抽样方法 计量检查 双 统计质量控制 抽样表 质量控制 

中国标准分类号：A41

国际标准分类号：03_120_30

摘      要：This British Standard specifies an acceptance sampling system of double sampling schemes for inspection by variables for percent nonconforming. It is indexed in terms of the acceptance quality limit (AQL). The objectives of the methods laid down in this British Standard are to ensure that lots of acceptable quality have a high probability of acceptance and that the probability of non-accepting inferior lots is as high as practicable. This is achieved by means of the switching rules, which provide: a) automatic protection to the consumer (by means of a switch to tightened inspection or discontinuation of sampling inspection) should a deterioration in quality be detected; b) an incentive (at the discretion of the responsible authority) to reduce inspection costs (by means of a switch to a smaller sample size) should consistently good quality be achieved. In this British Standard, the acceptability of a lot is implicitly or explicitly determined from an estimate of the percentage of nonconforming items in the process, based on either one or two random samples of items from the lot. This British Standard is 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. If there are different producers or production processes, this British Standard shall be applied to each one separately; b) where the items of product have a single quality characteristic (for multiple quality characteristics, see Annex A, Annex B and Annex C, which are all informative); c) where the quality characteristic is measurable on a continuous scale; d) where the measurement error is negligible (i.e. with a standard deviation no more than 10 % of the corresponding process standard deviation); e) where production is stable (under statistical control) and the quality characteristic is distributed, at least to a close approximation, according t