There are a large number of electrical equipment in power systems, factories, mines and enterprises, and most of their internal insulation is oil-filled insulation. In the insulation prevention test of power equipment, the parameters of the insulating oil of the power equipment are required to be measured regularly, and the measurement of the dielectric loss factor and resistivity of the insulating oil is one of the important ones. With the development of electronic technology and the power industry's requirements for small size, light weight, convenient operation, rapid measurement, high precision, etc., our company has developed a leading insulating oil dielectric loss factor and DC resistivity tester in China with reference to relevant instruments at home and abroad. The instrument is designed and manufactured according to GB/T5654 and related standards, using microcomputer control, easy to use, high measurement accuracy, high test efficiency, and greatly reducing the labor intensity of test personnel.