DIN EN 60721-3-9/A1:1995
環境條件分類.第3部分:環境參數及其嚴酷度分級.第9節:產品內微型氣候
Classification of environmental conditions - Part 3: Classification of groups of environmental parameters and their severities; section 9: Microclimates inside products (IEC 60721-3-9:1993/A1:1994); German version EN 60721-3-9:1993/A1:1995