No-load metering and online inspection tester for electric energy meter

The invention belongs to the technical field of electric energy metering and detection and in particular relates to a no-load metering and online inspection tester for an electric energy meter. The technical problem to be solved is to provide the no-load metering and online inspection tester for an electric energy meter, which is used for judging whether wiring circuit polarities and phases of a mutual inductor and an electric energy meter are accurate on line by using no load or false actuation of electric lines. With the adoption of the technical scheme, the no-load metering and online inspection tester for the electric energy meter is characterized by comprising an MCU (Micro Control Unit) microprocessor, an AD (Analog/Digital) converter, an LCD (Liquid Crystal Display), a zero-crossing detection circuit, a filter, a sampling voltage transformer and an amplifier, wherein the zero-crossing detection circuit comprises a first zero-crossing detection circuit GL1, a second zero-crossing detection circuit GL2 a