根据热电偶原理,由于镀层和底金属材质不同,故热电性能亦不同的推理,可依据与标准极接触所产生的热电势值来判断镀层的厚度。这种方法在检查镀层厚度小于20～30μ时,最为灵敏,且为线性关系,其准确度不亚于MT2型磁性厚度计。为了提高这种方法的可靠性,被检查件的表面必须用苯清洗。本方法对于软镀层为铅等难于测量。 According to the principle of thermocouple, due to different plating and bottom metal materials, the thermoelectric properties are also different. The thickness of the coating can be judged according to the thermoelectric potential generated by the contact with the standard electrode. This method is most sensitive when checking the coating thickness less than 20 ~ 30μ, and is linear, its accuracy is no less than MT2 magnetic thickness meter. In order to improve the reliability of this method, the surface of the object to be inspected must be cleaned with benzene. This method is difficult to measure for the soft coating lead.