Designation:E2428−15aStandardPracticeforCalibrationandVerificationofTorqueTransducers1ThisstandardisissuedunderthefixeddesignationE2428;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thepurposeofthispracticeistospecifytheprocedureforthecalibrationoftorquetransducers.NOTE1—Verificationbydeadweightandaleverarmisanacceptablemethodofverifyingthetorqueindicationofatestingmachine.TolerancesforweightsusedaretabulatedinPracticeE2624;methodsforcalibrationoftheweightsaregiveninNISTTechnicalNote577,MethodsofCalibratingWeightsforPistonGages.21.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Othermetricandinch-poundvaluesareregardedasequivalentwhenrequired.1.3Thispracticeisintendedforthecalibrationofstatictorquemeasuringinstruments.Thepracticeisnotapplicablefordynamicorhigh-speedtorquecalibrationsormeasurements,norcantheresultsofcalibrationsperformedinaccordancewiththispracticebeassumedvalidfordynamicorhighspeedtorquemeasurements.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:3E29PracticeforUsingSignificantDigitsinTestDatatoDetermineConformancewithSpecificationsE2624PracticeforTorqueCalibrationofTestingMachinesandDevices2.2ASMEStandard:B46.1SurfaceTexture42.3BIPMStandard5JCGM200Internationalvocabularyofmetrology–Basicandgeneralconceptsandassociatedterms(VIM)3.Terminology3.1Definitions:3.1.1primarytorquestandard—adeadweightforceappliedthroughaleverarmorwheel,alldisplayingmetrologicaltraceabilitytotheInternationalSystemofUnits(SI).3.1.1.1Discussion—forfurtherdefinitionofthetermmet-rologicaltraceability,refertothelatestrevisio...
