Electrical measurement of free space electric field sensors

Free space electric field sensor is the important load of satellite to obtain the information of electric field. Analysis of electric field offers a lot of information to the study area of earthquake monitoring, thunderstorm monitoring and radio wave propagation, improving the ability of major natural disasters monitoring. Owing to the high precision of sensors, it's necessary to test the electrical character aground before working in outer space. The paper describes the measurement method, system and results of free space electric sensor.