In power systems, railway systems, and large petrochemical plants and mines, enterprises have a large number of electrical equipment, and their internal insulation is mostly oil filled insulation type. The dielectric strength of insulation oil is a routine test that must be measured. To meet market demand, our company has independently developed and produced a series of insulation oil dielectric strength testers based on national standard GB/T507-2002, industry standard DL429.9-91, and the latest power industry standard DL/T846.7-2004. This instrument is based on a single-chip microcomputer, which realizes full automation of testing, high measurement accuracy, greatly improves work efficiency, and also greatly reduces the labor intensity of staff.