IEC 60068-2-39:2015提供了在组合温度或温度和湿度与低气压测试下测试设备或部件的测试方法和指南的描述。 第二版取消并取代了1976年出版的第一版，构成了技术修订。与上一版相比，此版本包括以下重大技术变更: a)IEC 60068系列的优选严重性； b)温度、湿度和低气压的组合。

IEC 60068-2-39:2015 provides a description of test methods and guidance for testing of equipment or components under combined temperature or temperature and humidity with low air pressure tests. This second edition cancels and replaces the first edition published in 1976 and constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
a) preferred severities of the IEC 60068 series;
b) combined temperature, humidity and low air pressure.