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inaisofantheshifterrorerrorscaleindicationPermissibleMaximumPermissibleErrorofScaleShiftErrorSMPE[JISB7507:2016]Theinsidecalipermeasurement,depthmeasurement,etc.,ifmeasuringsurfacesotherthantheoutsidemeasuringsurfacesareused.insideTheMaximummeasurementisgiveninTable1.TheMaximumPermissibleErrorSMPEofdepthmeasurementisobtainedbyadding0.02mmtoavalueinTable1.ThemaximumpermissibleerrorSMPEofancanbeobtainedbymeasuringtheinsidedimensionsusingtheinsidemeasuringfacesatanypositionwithinthemeasuringrangeusinggaugeblocksoranequivalentorhighergauge(Fig.2)andsubtractingthegaugedimensionfromtheindicatedvalueofthecaliper.insidemeasurementErrorSMPEindicationvaluetheforofGaugeblockFig.2:Determininginsidemeasurementindicationerror(example)CalipersCaliperPerformanceThetermusedthatwas"instrumentalIndustrialStandardinthein2016error"JapaneseJISB(JISB7507:2016)toJISB7507:1993wasCaliperperformancespecified7507forcaliperswasrevised2016:changedto“indicationerror.”Partialsurfacecontacterroristhemostimportantcaliperindicationerror.Theindicationerrorislimitedbythemaximumpermissibleerror(MPE).Inotherwords,MPEhasthesamemeaningastolerance.TherevisedcontentofJIS2016.inspectionmethodfollowingincludingdescribesstandarduntilthetheisanindicationMaximumPermissibleErrorEMPEofPartialMeasuringSurfaceContactErrorinaConventionalCaliper[JISB7507:2016]Thepartialmeasuringsurfacecontacterrorofacalipererrorappliedtotheoutsidemeasurement.Table1showstheMaximumPermissibleErrorEMPEoftheindicationvalueofthepartialmeasuringsurfacecontacterror.ThemaximumpermissibleerrorEMPEofancanbeobtainedbymeasuringtheinsidedimensionsusingtheinsidemeasuringfacesatanypositionwithinthemeasuringrangeusinggaugeblocksoranequivalentorhighergauge(Fig.1)andsubtractingthegaugedimensionfromtheindicatedvalueofthecaliper.insidemeasurementTable1:MaximumpermissibleerrorEMPEofpartialmeasuringfacecontactofconventionalcalipers(Unit:mm)Measurementlength50orlessOver50,100orlessOver100,200orlessOver200,300orlessScaleinterval,graduationorresolution0.05±0.05±0.06±0.07±0.080.02±0.02±0.03±0.04Note:EMPEincludesthemeasurementerrorarisingfromthestraightness,flatnessandparallelismofthemeasuringsurface.GaugeblockFig.1:Determiningofpartialmeasuringsurfacecontacterror(example)Calipers13-21
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