標(biāo)準(zhǔn)號(hào)：DIN ISO 3951-1-2008
中文標(biāo)準(zhǔn)名稱：變量檢驗(yàn)用取樣程序.第1部分:按接收質(zhì)量限(AQL)檢索的單一質(zhì)量特性和單一AQL的逐批檢驗(yàn)一次抽樣計(jì)劃的規(guī)范
英文標(biāo)準(zhǔn)名稱：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 (ISO 3951-1:2005); Text in German an
標(biāo)準(zhǔn)類型：A41
發(fā)布日期：1999/12/31 12:00:00
實(shí)施日期：1999/12/31 12:00:00
中國標(biāo)準(zhǔn)分類號(hào)：A41
國際標(biāo)準(zhǔn)分類號(hào)：03.120.30
引用標(biāo)準(zhǔn)：ISO 2859-1;ISO 3534-1;ISO 3534-2
適用范圍：This part of ISO 3951 specifies an acceptance sampling system of single sampling plans for inspection byvariables, in which the acceptability of a lot is implicitly determined from an estimate of the percentage ofnonconforming items in the process, based on a random sample of items from the lot.This part of ISO 3951 is primarily designed for application 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 only a single quality characteristic x of these products is taken into consideration, which must be measurable on a continuous scale;c) where the measurement error is negligible, i.e. with a standard deviation no more than 10 % of the process standard deviation;d) 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;e) 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: 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 ≥ Land x ≤ U (i.e. neither the lower nor the upper specification limit is violated).Inequalities 1) and 2) are called cases with a single specification limit, and 3) a case with double specificationlimits.If double specification limits apply, it is assumed in this part of ISO 3951 that conformance to bothspecification limits is equally important to the integrity of the product; in such cases it is appropriate to apply asingle AQL to the combined percentage of product outside the two specification limits. This is referred to ascombined control.