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PTC 8320D three phase energy auto-calibration system is a new generation, high precision, energy meter calibration equipment. It uses the advanced technology and components available in update technology, follows the national standard and regulation to develop and design. This bench can be used to test both single / 3 phase energy meter (up to class 0.2%). This bench is using the aluminum compound configuration to form with digital controlled signal source with PWM amplifier, HC3100 standard precision instrument, error processor system and auto-testing software.