Current measurement is indispensable in the field of measurement. It is important to improve product quality、ensure power system safe and stable、protect electrical equipment. Rogowski coil can measure current or the relevant parameter of a variety. Rogowski coil is widely used in the device of metering、monitor and protection. However, there are different index to the performance of sensor in different application environment. For example, metering device require sensor with high accuracy、monitoring device r...