>> P.547
CalipersLфDL<фDisengraved6.RelationshipbetweenaccuracyandtemperatureThemainscaleofacaliper(ormountedon)stainlesssteel,andalthoughthelinearthermalexpansioncoefcientisequaltothatofthemostcommonworkpiecematerial,steel,i.e.(10.2±1)×10-6/K,notethatotherworkpiecematerials,theroomtemperatureandtheworkpiecetemperaturemayaffectmeasurementaccuracy.7.HandlingCaliperjawsaresharp,andthereforetheinstrumentmustbehandledwithcaretoavoidpersonalinjury.Avoiddamaginganidenticationnumberorotherinformationonitwithanelectricmarkerpen.Avoiddamagingacaliperbysubjectingittoimpactwithhardobjectsorbydroppingitonabenchortheoor.anddonotadigitalscaleofengravecaliperthe8.MaintenanceofbeamslidingsurfacesandmeasuringfacesWipeawaydustanddirtfromtheslidingsurfacesandmeasuringfaceswithadrysoftclothbeforeusingthecaliper.thejawsandensure9.CheckingandsettingtheoriginbeforeuseClosebeforeusingthecaliper.Whenusingreplacingthebattery.thevernierscaleaDigimatictheorigincaliper,resetthat(ordisplay)readszero(ORIGINbutton)afterCalipers10.HandlingafteruseAfterusingthecaliper,completelywipeoffanywaterandoilandlightlyapplyanti-corrosionoilbeforestorage.Wipeoffwaterfromawaterproofcaliperaswellbecauseitmayalsorust.ORIGINbuttonsetsdisplaytozeroClosejawscompletelyBatteryhighdirectsunlight,temperatures,11.Notesonstorage:Avoidhumidityduringstorage.Ifadigitalcaliperwillnotbeusedformorethanthreemonths,removethebatterybeforestorage.Donotleavethejawsofacalipercompletelyclosedduringstorage.temperatures,highandlow13-202.InsidemeasurementInserttheinsidejawasdeeplyaspossiblebeforemeasurement.Readthemaximumindicatedvalueduringinsidemeasurement.Readtheminimumindicatedvalueduringgroovewidthmeasurement.3.DepthmeasurementReadtheminimumindicatedvalueduringdepthmeasurement.4.ParallaxerrorwhenreadingthescalesLookstraightattheverniergraduationlinewhencheckingthealignmentofverniergraduationlinestothemainscalegraduationlines.Ifyoulookataverniergraduationlinefromanobliquedirection,aparallaxeffectiscausedbythedifferencebetweenthetipofthevernierscaleandthemaintobeoffbyΔXasshowninthegurebelow,resultinginareadingerrorofthemeasuredvalue.Toavoidthiserror,theJISstipulatesthatthestepheightshouldbenomorethan0.3mm.thematchingpositionappearsscale.Consequently,HHΔXfaceprovides5.MovingJawTiltErrorslider.Consequently,Theguidemeasurementerrorsresultwhenthefacebecomeswarped,asshowninthegure.ThiserrorcanberepresentedbythesamecalculationformulaforerrorscausedbynonconformancetoAbbe'sPrinciple.thebasiscaliper’sΔXtheforℓahℓhfℓExample:Assumethattheerrorslopeofthejawsduetotiltoftheslideris0.01mmin50mmandtheoutsidemeasuringjawsare40mmdeep,thentheerror(atthejawtip)iscalculatedas(40/50)x0.010mm=0.008mm.f=40mm×0.01÷50=0.008mmTheeffectsofaguidefacethatiswornordeformedbecauseitwashandledcarelesslycannotbeignored.
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