Megger manufactures power box, mprt which is the heart of the system. The product is designed to perform routine testing of protective relays used in the operation of electric utilities, power plants and heavy industrials, and eliminates the complexity of relay testing. It employs a variety of new features including unique voltage and current generator with components, which have been combined into one amplifier package. Using multiple vi-gens provides the flexibility to deliver four voltages and four currents or eight current channel capabilities. Power box also incorporates four communication ports, a new constant power output capability. The mprt system is comprised of a `power box, a touchview interface and avts software. The touchview interface [tvi] device and avts basic software are necessary software for the system. The salient features of power box are:
