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MEP1 is a powerful multifunction power meter with modular design, which can be applied for monitoring and controlling of the electrical system. MEP1 can measure and analyze real time data, such as U, I, P, Q, S, COSΦ, F, kWh, knar, etc. MEP1 has the following functions: RS-485 communication port, 2 energy pulse output (include active energy and reactive energy), Max/min data record, and SOE event record. MEP1 can extend functions by choosing the external optional modules: harmonic analysis, 8 remote signals on/off mode, programmable 4 analog outputs (0~5V or 4~20mA optional), data storage, Profile bus Com. Protocol, Ethernet communication functions. The multi-tariff function allows the user to measure energy in any interval (the min. interval is 30min.), which can read the sum, sharp, peak, valley, flat energy data in 30 days, and measure 2nd to 63rd harmonics in statistics. All our instruments fulfill all important requirements and regulations concerning electromagnetic compatibility and safety isolation (IEC61000, IEC1010 standard and EN61010 standard). The devices have been developed, manufactured and tested in accordance with Quality Assurance System ISO 9001.