The PD7777 series is a next-generation programmable intelligent instrument designed for precise power monitoring and energy measurement. Engineered to meet the demands of power systems, the communications sector, and the construction industry, this multi-functional meter integrates measurement and communication capabilities. It enables real-time monitoring and display of key electrical parameters, including voltage, current, active and reactive power, frequency, power factor, and four-quadrant energy. Featuring an RS485 communication interface, it seamlessly connects with external devices for efficient networked operation.