1.1 目的- 本规程以MIL-STD-414为基础，建立了批量或分批抽样计划和程序，用于通过变量进行检验，以对AQL索引的稳定批次流进行抽样。 1.2 本规程提供了ASTM格式的MIL-STD-414抽样计划，供ASTM委员会和其他机构使用。它承认在ASTM支持的行业中继续使用MIL-STD-414。MIL-STD-414中的大部分原文保存在章节中 6 – 9 这种做法。 1.3 以英寸-磅为单位的数值应视为标准值。 本标准不包括其他计量单位。 1.4 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 本规程旨在满足客户采购、供应和储存以及维护检验操作中使用标准抽样计划进行变量检验的日益增长的需求。变量抽样计划适用于可在连续尺度上测量的单个质量特征，质量以缺陷百分比表示。变量抽样计划（包括运行特性曲线）制定的理论假设质量特性的测量值是独立的、同分布的正态随机变量。 5.2 与属性抽样计划相比，变量抽样计划的优点是通常可以节省大量样本量，以确保判断单个质量特征时决策的正确性，或者对于相同的样本量，使用变量计划可以获得更大的保证。属性采样计划的优点是更简单，适用于单个或多个质量特征，并且不需要了解任何质量特征的连续测量值的分布。 5.3 重要的是要注意，变量采样计划不能随意使用，因为可以获得变量测量数据。在考虑可能质疑正态性或独立性假设的应用时，建议用户咨询其技术机构，以确定应用的可行性。 5.4 应用程序- 本出版物中指定的抽样计划适用于但不限于以下各项的检查: (1) 最终项目， (2) 组件和原材料， (3) 运营或服务， (4) 在制材料， (5) 库存物资， (6) 维护操作， (7) 数据或记录，以及 (8) 行政程序。

1.1 Purpose— This practice establishes lot or batch sampling plans and procedures for inspection by variables using MIL-STD-414 as a basis for sampling a steady stream of lots indexed by AQL. 1.2 This practice provides the sampling plans of MIL-STD-414 in ASTM format for use by ASTM committees and others. It recognizes the continuing usage of MIL-STD-414 in industries supported by ASTM. Most of the original text in MIL-STD-414 is preserved in Sections 6 – 9 of this practice. 1.3 The values stated in inch-pound units are to be regarded as standard. No other units of measurement are included in this standard. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 This practice was prepared to meet a growing need for the use of standard sampling plans for inspection by variables in customer procurement, supply and storage, and maintenance inspection operations. The variables sampling plans apply to a single quality characteristic which can be measured on a continuous scale, and for which quality is expressed in terms of percent defective. The theory underlying the development of the variables sampling plans, including the operating characteristic curves, assumes that measurements of the quality characteristic are independent, identically distributed normal random variables. 5.2 In comparison with attributes sampling plans, variables sampling plans have the advantage of usually resulting in considerable savings in sample size for comparable assurance as to the correctness of decisions in judging a single quality characteristic, or for the same sample size, greater assurance is obtained using variables plans. Attributes sampling plans have the advantage of greater simplicity, of being applicable to either single or multiple quality characteristics, and of requiring no knowledge about the distribution of the continuous measurements of any of the quality characteristics. 5.3 It is important to note that variables sampling plans are not to be used indiscriminately, simply because it is possible to obtain variables measurement data. In considering applications where the normality or independence assumptions may be questioned, the user is advised to consult his technical agency to determine the feasibility of application. 5.4 Application— Sampling plans designated in this publication are applicable, but not limited, to inspection of the following: (1) end items, (2) components and raw materials, (3) operations or services, (4) materials in process, (5) supplies in storage, (6) maintenance operations, (7) data or records, and (8) administrative procedures.