基于AD7755的掌上型电能表现场校验仪的设计与实现

Design and Implementation of the Palmtop Electric Energy Meter field calibrator based on AD7755

分析了现场校验仪的测量原理,给出了被校电度表的电压、电流、功率、电能表误差等参数的计算公式,并以CPU89C2051为控制计算核心,AD7755为测量核心,配以高精度钳型电流互感器和液晶显示模块,设计和实现了掌上型电能表现场校验仪系统.该系统可在不拆表、不断电的情况下,快速准确地测出被校电度表的电压、电流、功率、电能表误差等参数.

In this paper,the measuring principle of the field calibrator is analyzed,the computational formulas of the voltage,the current,the power and the error of the electric energy meter are given.On the basis of high-precision clamp current transformer and the liquid crystal display model,the system of the palmtop electric energy meter field calibrator is designed and implemented.In this system,the CPU 89C2051 is adopted as the control center,AD7755 is adopted as the measuring center.The result of the experimental shows that this system can measure the voltage,the current,the power and the error of the electric energy meter fast and accurately.