This insulating oil dielectric strength tester is designed as per requirements of IEC156 Test Method for Insulation Oil Breakdown Voltage. It has functions of auto boosting, step down, stirring, display and printing out. After breakdown of oil, HV break off will operate within 10 seconds to enable an auto isolation of control system partly; this effectively safeguards the personnel security and equipment safety. It adopts industrial SCM to control which is applied to integrate circuit, new model I/0 connection, particular testing and anti-jamming technology which largely improves the machine's capacity.