It is designed by 24-bit DSP, 16-bit high precision AD converter and high speed MPU unit, and the human-machine dialogue function control mode is realized through health control and digital display window. The software adopts RTOS design idea. Can measure circuit power, reactive power, apparent power, power factor, voltage, current parameters. The power measurement accuracy is level 1.0, the power factor measurement range is 0.3 ~ 1.0, and the voltage and current range is 500V and 5A. It has rs-485 communication interface and adopts standard modbus-rtu communication protocol. The installation mode is industrial-grade cabinet.