Working principle of current sensor

Current sensors can be divided into: transformer, electromagnetic induction principle, can only measure alternating current, generally used to measure power frequency alternating current Hall current sensor, Hall effect principle, generally used to measure AC and DC current; Rogowski coil, Electromagnetic induction and the ampere loop law can only measure alternating current, with good high frequency characteristics; shunt, Ohm's law, generally used to measure direct current; AnyWay variable frequency power sensor, a new digital sensor, suitable for high accuracy variable frequency current and power Metering.