描述了在试验温度下测定任何绝缘液体材料的介电损耗因子、相对介电常数和直流电阻率的方法。 这些方法主要用于对未使用的液体进行参考试验。它们也可用于变压器、电缆和其他电气设备中使用的液体。然而，该方法仅适用于单相液体。当需要进行常规测定时，可采用附录C中所述的简化程序。 对于碳氢化合物以外的绝缘液体，可能需要其他清洁程序。 上一版的主要变化涉及首选测量方法。

Describes methods for the determination of the dielectric dissipation factor, relative permittivity and d.c. resistivity of any insulating liquid material at the test temperature. The methods are primarily intended for making reference tests on unused liquids. They can also be applied to liquids in service in transformers, cables and other electrical apparatus. However the method is applicable to a single phase liquid only. When it is desired to make routine determinations, simplified procedures, as described in Annex C, may be adopted. With insulating liquids other than hydrocarbons, alternative cleaning procedures may be required. The main changes from the previous edition deal with the preferred measurement method.