ANSI/ASTM D257-2007 绝缘材料的直流电阻或电导系数用试验方法

标准号：ANSI/ASTM D257-2007
中文标准名称：绝缘材料的直流电阻或电导系数用试验方法
英文标准名称：Test Methods for DC Resistance or Conductance of Insulating Materials
标准类型：K15
发布日期：2007/5/22 12:00:00
实施日期：1999/12/31 12:00:00
中国标准分类号：K15
国际标准分类号：29.035.01
适用范围： 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 conductances and conductivities.These test methods are not suitable for use in measuring the electrical resistance/conductance of moderately conductive materials. Use Test Method D 4496 to evaluate such materials.This standard describes several general alternative methodologies for measuring resistance (or conductance). Specific materials can be tested most appropriately by using standard ASTM test methods applicable to the specific material that define both voltage stress limits and finite electrification times as well as specimen configuration and electrode geometry. These individual specific test methodologies would be better able to define the precision and bias for the determination. The procedures appear in the following sections: This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.