摘要单相电表检测仪是用于现场检验低压单相电能表计量是否准确的专用仪器。本文针对检测仪的技术要求，阐述了系统的总体方案设计、硬件电路设计和软件设计，分析了影响测量精度的主要原因及解决方法。本文的主要研究内容是针对低压单相电能表的现场检验，实现系统要求的检测功能和技术指标。采取的技术方案是以微控制器为核心，利用微型电压互感器和钳形电流互感器分别将单项供电电压和电流变换为弱电信号，实现对供电电路的电压和电流进行实时检测，同时通过电能计量芯片测量实际的有功功率，充分利用微控制器较强的运算功能，计算出一定时间内消耗的电能，同时利用光电采样器对被测表的计量的电能进行检测，从而计算出被测电能表的误差。现场检验的特点是不停电接线，对于电流检测需采用钳形电流互感器，而钳形电流互感器的开口接触面存在空气间隙，使互感器的线形变差并存在较大的相移，且一致性较差。采用分段线性化处理，可以提高测量的精度。本文内容涉及微控制器、电气测量技术等多项应用技术，具有一定的应用价值与实际意义。关键词：微控制器；低压单相电能表；现场检测TitleThedesignoflocalcalibratinginstrumentforlow-voltageWatt-hourmeterbasedonMCUAbstractThelocalcalibratinginstrumentforthesingle-phasewatt-hourmeterisaspecialdevicethatisusedtomeasuretheaccuracyoflow-voltageWatt-hourmeterinsceneexamine.Thispaper,accordingtothetechnicalrequirementsofdetectors,tellsustheoveralldesignofthesystem,hardwareandsoftwarecircuit,andanalyzesthereasonoftheimpactofmeasurementaccuracyandthemainmeasurestosolution.Themainresearchcontentisthelow-voltagesingle-phasewatt-hourmeteron-siteinspection,therealizationofthedetectionsystemrequirementsandtechnicalindicators.Thetechnicalplanistakingthemicro-controllerasthecore,usingthemini-voltagetransformerandclampcurrenttransformerrespectivelytotransformthesinglepowersupplyvoltageandcurrenttransformationtotheweakelectricalsignal,andtorealizethereal-timedetectionforthepowersupplycircuitofvoltageandcurrent,atthesametime,energymeteringchipcanmeasurethetruevalue,takefulladvantageofstrongcomputingmicrocontrollerfunctions,tocalculatewithinacertainperiodoftimethepowerconsumption,whileusingtheoptoelectronicsamplermeasurementtomeasurethewatt-hourmeter,thencalculatingtheerrorofthismeter.Thecharacteristicsoftheon-siteinspectionisNon-powercables,Theclampcurrenttransformerisusedtocurrentdetection,buttheclampcurrenttransformer’sinterfaceexistairgap,causesthelineoftransducerbecomeerrandandexistinabiggerphase-shift,alsotheuniformitybecomeworse.Usingpartitionlinearityprocessing,thatmayenhancethesurveyprecision.Thisarticlerelatedtomicro-controllers,anumberofelec