ASTM D257绝缘材料直流电阻或电导率标准试验方法
日期:2012-02-10 11:07
ASTM D257 Standard Test Methods for DC Resistance or Conductance of Insulating Materials
ASTM D257绝缘材料直流电阻或电导率标准试验方法
1. Scope
1.1 These test methods cover direct-current procedures for the measurement of dc insulation resistance, volume resistance, and surface resistance. From such measurements and the geometric dimensions of specimen and electrodes, both volume and surface resistivity of electrical insulating materials can be calculated, as well as the corresponding conductanc
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