A-Reference-Design-for-High-Performance--Low-Cost-Weigh-Scales.doc


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AReferenceDesignforHigh-Performance,Low-CostWeighScalesByColmSlattery, (@)MariahNie, (@)uracyandlowercosthasproducedanincreaseddemandforhigh-;mostweighscalesoutputthefinalweightvalueataresolutionof1:3,000or1:10,000,whichiseasilymet(apparently)bya12-bitto14-bitADC(analog-to-digitalconverter).However,plished;infact,,wediscusssomeofthesystemspecificationsofweighscalesanddealwithconsiderationsfordesigningandbuildingaweigh--to-peak-noiseresolution,A/D-converterdynamicrange,gaindrift,,usingaweigh--monweigh-scaleimplementationistouseabridge-typeload-cellsensor,-cellbridgeisillustratedinFigure1;itisa4-resistorbridgecircuitwithatleasttwovariablearms,mon-(one-halfthesupplyvoltage)., totalerror,and ’selectricalsensitivity,definedastheratioofthefull-loadoutputtotheexcitationvoltage,is2 mV/-mV/Vsensitivityand5-Vexcitation,thefull-,inordertousethemostlinearportionoftheloadcell’sspan,onlyabouttwo- 6-mV full-scalerangeinsuchawayastogetthehighestachievableperformance—%.Itisaveryimportantspecification,uracythatcouldbereachedwithanidealsignalconditio

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