The XHYY102 series insulating oil dielectric strength tester executes the program strictly according to the preset parameters through the single-chip microcomputer. After running, the results can be printed as needed. The instrument has strong anti-interference and simple operation, with only three buttons for boost, stop and step down. It has adjustable boost speed, overpressure, overcurrent, automatic return to zero, automatic stirring after breakdown, automatic locking of breakdown data and accurate values. The oil cup is placed with protective devices such as power supply chain, safe and practical. The instrument is small in size, easy to carry, strong in anti-interference ability, and has a wide range of applications.