ISO 3951-1:2022 变量检验用取样程序 第1部分：按合格质量水平（AQL）检索的单一质量特征和单一AQL逐批检验用单一抽样计划规范

标准编号：ISO 3951-1:2022

中文名称：变量检验用取样程序 第1部分：按合格质量水平（AQL）检索的单一质量特征和单一AQL逐批检验用单一抽样计划规范

英文名称：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 characteristi

发布日期：2022-08

标准范围

本文件规定了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种生产工艺提供；b)其中仅考虑这些产品的单个质量特性x，其可在连续尺度上测量；c)其中生产处于统计控制之下，并且质量特性x根据正态分布或接近正态分布的近似分布；d)其中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满足以下不等式之一，则该项目被认为是合格的:1)？x？≥？L（即不违反质量标准下限）；2)？x？≤？U（即不违反质量标准上限）；3)？x？≥？L和x？≤？U（即既不违反质量标准的下限也不违反上限）。不等式1）和2）是具有单规格极限的情况，3）是具有双规格极限的情况。在适用双质量标准限度的情况下，本文件假设符合两个质量标准限度对产品的完整性同等重要。在这种情况下，将单个AQL应用于超出两个质量标准限度的产品的组合百分比是合适的。这被称为组合控制。

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.

标准预览图