GB/T 2423.4-2008 in English

《GB/T 2423.4-2008电工电子产品环境试验 第2部分：试验方法 试验Db： 交变湿热（12h＋12h循环）》由TC8（全国电工电子产品环境条件与环境试验标准化技术委员会）归口，TC8SC2（全国电工电子产品环境条件与环境试验标准化技术委员会气候环境试验分会）执行，主管部门为中国电器工业协会。
本部分适用于确定元件、设备或其他产品在高湿度与温度循环变化组合且通常会在试验样品表面产生凝露的条件下使用、运输和贮存的适应性。如果本试验用于检验带包装样品在运输和贮存过程中的性能时,应带包装一起进行试验。

1 Scope

This part determines the suitability of components, equipment or other articles for use, transportation and storage under conditions of high humidity–combined with cyclic temperature changes and, in general, producing condensation on the surface of the specimen. If the test is being used to verify the performance of a specimen whilst it is being transported or stored in packaging then the packaging will normally be fitted when the test conditions are being applied.
For small, low mass specimens, it may be difficult to produce condensation on the surface of the specimen using this procedure; users should consider the use of an alternative procedure such as that given to GB/T 2423.34-2005.

2 Normative References

The following standards contain provisions which, through reference in this Part of GB/T 2423, constitute provisions of this Part. For dated reference, subsequent modification to, or revisions of, any of these publications do not apply. However, all parties coming to an agreement according to this Part are encouraged to study whether the latest edition of these documents is applicable. For undated references, the latest edition of the normative document is applicable to this Part.

Contents
Foreword I
1 Scope
2 Normative References
3 General Descriptions
4 Testing Chamber-Construction Requirements
5 Severities
6 Initial Measurements
7 Conditioning
8 Intermediate Measurements
9 Recovery
10 Final Measurements
11 Information to be Given in the Relevant Specification
Annex A (Informative) Guidance