Designation:F811−02(Reapproved2010)StandardPracticeforAccelerometerUseinVehiclesforTireTesting1ThisstandardisissuedunderthefixeddesignationF811;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticecoversguidelinesforusingaccelerometersintestvehiclestoevaluatedynamicaccelerationsresultingfromvariousmaneuverssuchasbraking,accelerating,orcornering.1.2Thispracticeisapplicabletoaccelerometersthatarerigidlyattachedtothebodyofthetestvehicleorstabilizedtotheearth-fixedaxissystembymeansofagyroscope.1.3ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.Specificprecau-tionsaregiveninSection6.2.ReferencedDocuments2.1ASTMStandards:2F538TerminologyRelatingtotheCharacteristicsandPer-formanceofTires3.Terminology3.1Definitions:3.1.1accelerometer,n—aninstrumentthatsensesinertialreactiontomeasurelinearorangularacceleration.F5383.1.2bandwidth,[1/T],n—therangeoffrequencieswithinwhichcertainperformancecharacteristicsoccur;specificlimitsnormallyapply.F5383.1.3g,n—aunitofaccelerationwhere1gisequaltotheaccelerationofgravity,9.8m/s2(32.2ft/s2).F5383.1.4gyro-stabilizedaccelerometer,n—aprecisionverticalgyroscopefittedwithonetothreeaccelerometerstoprovideorthogonalmeasurementsreferencedtotheearth-fixedaxissystem.F5383.1.5servoaccelerometer,n—anaccelerometercontainingservomechanisms,electronics,andaseismicelementtosenseinertialreaction.F5383.1.6straingageaccelerometer,n—anaccelerometerusingstraingagestosensethemotionoftheseismicelement.F5383.2DefinitionsofTermsSpecifictoThisSt...
