IEC 62631-3-2:20 23描述了通过施加直流电压测定电绝缘材料的表面电阻和表面电阻率的测试方法。与上一版相比，此版本包括以下重大技术变更: a)已经阐明了电极布置的描述； b)增加了导电装置的新描述； c)增加了一个新的信息性附件B，总结了使用不同电极布置的表面电阻率比较验证研究的结果。

IEC 62631-3-2:2023 describes methods of test for the determination of surface resistance and surface resistivity of electrical insulation materials by applying DC voltage. This edition includes the following significant technical changes with respect to the previous edition:
a) descriptions of the electrode arrangements have been clarified;
b) new descriptions of the conductive means have been added;
c) a new informative Annex B summarizing the results of the comparative verification study on surface resistivities using different electrode arrangements has been added.