基于SOPC的手持式电能表现场校验仪设计

摘要

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.%设计一种基于SOPC的手持式电能表现场校验仪.该现场校验仪用NIOS-Ⅱ软核处理器作为核心控制器实现数据的高速运算、处理并显示;使用数字锁相倍频技术,对三相电压、三相电流进行同步采样;采用捕获脉冲计数比较的校验算法实现了对电能表的准确校验.给出了校验算法、系统原理图和主要的软件流程图.实验表明该仪器精度优于0.1级.