Designation:E1448/E1448M−09(Reapproved2015)StandardPracticeforCalibrationofSystemsUsedforMeasuringVehicularResponsetoPavementRoughness1ThisstandardisissuedunderthefixeddesignationE1448/E1448M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticedescribesequipmentandproceduresforthecalibrationofsystemsusedformeasuringvehicularre-sponsetopavementroughness.Suchsystemsarereferredtoasresponse-typesystems.(SeeTestMethodE1082.)1.2Theresponse-typesystemincludesthedrivenvehicle,thedriverandcontentsofthevehicle,thetowedtrailer(ifoneisusedwiththesystem),andadevicecalledaroadmeterthatmeasuresthevehicleresponsetopavementroughness.Theroadmetermaybemountedinanautomobile,van,orinatowedtrailer.Response-type(roadmeter)devicescoveredinthispracticeinclude:devicesmeasuringtherelativeaxle-bodymotionofavehicle,devicesmeasuringtheverticalaccelera-tionofthevehiclebody,anddevicesmeasuringtheverticalaccelerationofthevehicleaxle.1.3ThecalibrationproceduresdescribedinthispracticearelimitedtotheuseofthesimulationsdescribedinPracticeE1170.1.4Thispracticeisnotintendedtoapplytopavementroughnessmeasuringequipmentwhoseoutputisnotinfluencedbytheresponseofthehostvehicle.1.5ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2E867TerminologyRelatingtoVehicle-PavementSystemsE950TestMethodforMeasu...
