标准编号：ISO/TR 8550-3:2007
中文名称：批中离散项检验用进料抽样系统的选择和使用指南 第3部分：变量抽样
英文名称：Guidance on the selection and usage of acceptance sampling systems for inspection of discrete items in lots — Part 3: Sampling by variables
发布日期：2007-06
标准范围
The guidance in this part of ISO/TR 8550 is confined to acceptance sampling of products that are supplied inlots and that can be classified as consisting of discrete items (i.e. discrete articles of product). Each item in alot can be identified and segregated from the other items in the lot and has an equal chance of being includedin the sample. Each item of product is countable and has specific characteristics that are measurable on acontinuous scale. Each characteristic has, at least to a good approximation, a normal distribution or adistribution that can be transformed so that it closely resembles a normal distribution.Standards on acceptance sampling by variables are applicable to a wide variety of inspection situations.These include, but are not limited to, the following:a) end items, such as complete products or sub-assemblies;b) components and raw materials;c) services;d) materials in process;e) supplies in storage;f) maintenance operations;g) data or records;h) administrative procedures.Although this part of ISO/TR 8550 is written principally in terms of manufacture and production, it should beinterpreted liberally as it is applicable to the selection of sampling systems, schemes and plans for all types ofproduct and processes as defined in ISO 9000.
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