标准摘要
[中文适用范围]： 定义了产品内部组件（基本零件、组件、内置单元）可能受到的微气候条件类别，这些产品在 IEC 721-3-3 和 IEC 721-3-4 部分中分类的气候条件下使用。特点 [外文原描述]： Defines classes of microclimatic conditions, to which components (basic parts, assemblies, built-in units) may be subjected inside products, and which are used under the climatic conditions classified in IEC 60721-3-3 and IEC 60721-3-4.
英文名称Classification of environmental conditions - Part 3: Classification of groups of environmental parameters and their severities - Section 9: Microclimates inside products