IEC 60247 pdf download Insulating liquids – Measurement of relative permittivity, dielectric dissipation factor (tan δ δ ) and d.c. resistivity 1 scope This International standard describes methods for the determination of the dielectric dissipationfactor (tan o), relative permittivity and d.c. resistivity of any insulating liquid material at the testtemperature. The methods are primarily intended for making reference tests on...