变量检验的抽样程序.第1部分:单个质量特性和单个AQL的逐批检验用验收质量限（AQL）索引的单个抽样计划规范

[中文适用范围]： 本文件规定了在以下条件下逐批检验的单次抽样计划： a) 检验程序适用于一系列连续批次的离散产品，所有产品均由一个生产商使用一个生产过程提供； b) 仅考虑这些产品的单一质量特性 x，该质量特性可在连续范围内测量； c) 生产处于统计控制之下且质量特性 x 根据正态分布或接近正态分布的分布； d) 合同或标准定义了规格下限 L、规格上限 U 或两者。 如果一个项目的测量质量特性 x 适当地满足以下不等式之一，则该项目被认定为合格： 1) x ≥ L（即不违反规格下限）； 2) x ≤ U（即不违反规格上限）； 3) x ≥ L 且x ≤ U（即不违反规格下限或规格上限）。 不等式 1) 和 2) 是具有单规格限的情况，3) 是具有双规格限的情况。 在适用双重规格限值的情况下，本文件假定符合两个规格限值对于产品的完整性同样重要。 在这种情况下，适当的做法是对超出两个规格限值的产品的总百分比应用单一 AQL。 这被称为组合控制。 [外文原描述]： 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.