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

LI Yong-jun1,XU Xiao-rong2,XIAO Hai-hong3,LIANG Yong1(1.Henan University,Kaifeng 475001,China;2.Hunan University of Arts and Science,Changde 415000,China;3.Zhenzhou Huate MAC the New Technique CO.,LTD.Zhenzhou 450052,China)  
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.
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