Electric car ac charging pile checking instrument, the electric car is dc charging machine checking instrument electric vehicle charging pile/machine measurement standard, it is accurate and reliable measuring instruments to check the value of the electric vehicle charging pile/machine provides the guarantee; Through to the domestic electric vehicle charging pile/machine long-term comprehensive verification test and theoretical study, a comprehensive mastery of the electric vehicle charging pile/machine check production levels and quality state, in a large amount of actual data, the minimum current, temperature coefficient, distortion, ripple source of study, such as master key parameter values and detection methods, writing to lay a solid foundation for the construction of national regulations.