Single-phase Electric Parameter Measuring Instrument Based on STM32F407

With high precision meter IC CS5460A as the core of measurement,this paper designs single-phase electric parameter measuring instrument based on STM32F407 microcontroller. Cooperating with voltage and current sampling circuit with mutual inductance,the system uses A / D converter of chip CS5460A by instantaneous sampling method to measure the effective values of voltage and current and calculates the apparent power,active power and reactive power. The 12864 LCD is used for showing each parameter. The experimental results show that the design of system is reasonable and its work is stable.