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Standard Test Methods for DC Resistance or Conductance of ...

Designation: D257 07An American National StandardStandard Test Methods forDC Resistance or Conductance of Insulating Materials1 This Standard is issued under the fixed designation D257; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon ( ) indicates an editorial change since the last revision or Standard has been approved for use by agencies of the Department of Scope* These test Methods cover direct-current procedures forthe measurement of dc insulation Resistance , volume Resistance ,and surface Resistance . From such measurements and thegeometric dimensions of specimen and electrodes, both vol-ume and surface resistivity of electrical insulating materialscan be calculated, as well as the corresponding conductancesand These test Methods are not suitable for use in measuringthe electrical Resistance / Conductance of moderately conductivematerials.

1.2 These test methods are not suitable for use in measuring the electrical resistance/conductance of moderately conductive materials. Use Test Method D4496 to evaluate such materials. 1.3 This standard describes several general alternative methodologies for measuring resistance (or conductance).

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