Hand-held Design of Field Calibrator for Electric Energy Meter Based on SOPC

Hand-held design of field calibrator for electric energy meter based on SOPC is proposed in this paper.The field calibrator makes a NIOS-II soft-core processor as the core,achieving high-speed data operation,processing and display.It uses digital lock frequency multiplier,the three-phase voltage and three-phase current for synchronous sampling.Capture compared with pulse counting algorithm is used for checking the accuracy of meter calibration.The check algorithm,system diagram,and the software flow chart are provided.Experiments show that the instrument accuracy is better than 0.1.