Measurement and control instrument is a kind of instrumentation device for measuring, controlling and monitoring industrial processes, which can measure, control and display various industrial process parameters and transmit these parameters to the control system. It is an advanced intelligent, digital front-end acquisition component, has been widely used in various control systems, SCADA systems and energy management systems. The measurement and control instrument can replace the conventional power transmitter and measurement instrument, adopting AC sampling technology, it can measure the parameters of current, voltage, power, power factor and electric energy in the power grid respectively, and the multiplier can be set through the panel membrane switch with RS485 communication, alarm output, switching input/output and other functions.