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1、ASSUMPTIONUNIVERSITYFacultyofEngineeringPhysicsLaboratoryName:_________________________________________Code:_________________Sec:______1.Experiment:Verniercalipers2.Objective:Todeterminethedimensionsofgivensmallobjectsbyusingverniercalipers.3.Apparatus:Verniercalipers,rectan

2、gularobject,cylindricalobjectandelectronicdigitalscale.4.Theory:TheVernierCalipersisaprecisioninstrumentthatcanbeusedtomeasureinternalandexternaldimensionsofsmallobjectsextremelyaccurately.Theverniercalipersenableustoobtainanaccurateresultuptotheseconddecimalplaceinmillimete

3、r.(e.g.0.05mmand0.02mm)Themainscaleandvernierscalearemarkedontheinstrument.Thesumofabovetwoscalemeasurementsandzeroerrorreading(or)zeroerrorcorrectionoftheverniercaliperistherequireddimensionofthemeasurementoftheobjectTousethevernierscale,Leastcount(LC)andzeroerrorreading(or

4、)zeroerrorcorrectionoftheverniercalipermustbecheckedandrecordedbeforemeasuringtheobject.(a)LeastCountofverniercalipersLeastCount(LC)foraninstrumentistheminimummeasurementthatcanbemadeaccuratelybyameasuringdevice.Ameasuringinstrumentcannotmeasureanythingwhosedimensionsareless

5、thanthemagnitudeofleastcount.Theinstrumentwillhavemoreprecisemeasurementifthemagnitudeofleastcountissmallervalue.LastCountofverniercalipersistheminimummeasurementbyverniercalipers.Themagnitudeofleastcountofverniercalipersisdependingonthenatureofthescale(mm,cm,inch,etc.)andth

6、enumberofdivisiononvernierscale.Theleastcountofverniercaliperscanbecalculatedbythedifferenceofonevernierscaledivisionandmainscaledivision(s),whichisnearesttotheonevernierdivision.(Or)LastCountofverniercaliperscanbecalculatedbytakingreciprocalofnumberofvernierdivisions.Exampl

7、esofleastcountcalculationfordifferentvernierscaledivisionsExampleI1maindivision=1mmCalculationMethod(I)Leastcountofverniercaliperscanbecalculatedbythedifferenceofonevernierscaledivisionandmainscaledivision(s),whichisnearesttotheonevernierdivision.10vernierdivision=9maindivis

8、ion1vernierdivision=0.9maindivision1vernierdivision=0.9mmAccordingtothediag