According to the analysis of the process of SDI test
a new automatic test method is designed.It is not operated by hand
so its accuracy is better than the old method.It can get the data automatically.The main parts of intelligent device include embedded MCU and flux meter.Hardware circuit such as embedded system
power system is designed.Displaying system of LCD is set up and a large amount of software program is developed.The SDI index can be automatically tested.The testing error is low than 1 %.The device has the features of easy-operating