Designation:E2867−14StandardPracticeforEstimatingUncertaintyofTestResultsDerivedfromSpectrophotometry1ThisstandardisissuedunderthefixeddesignationE2867;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticedescribesaprotocoltobeutilizedbymeasurementlaboratoriesforestimatingandreportingtheuncertaintyofameasurementresultwhentheresultisderivedfromameasurandthathasbeenobtainedbyspectrophotom-etry.1.2Thispracticeisspecificallylimitedtothereportingofuncertaintyofcolormeasurementresultsthatarereportedascolor-differencesin∆Eformat,eventhoughthemeasurementitselfmaybereportedinotherunitssuchaspercentreflectanceortransmittance.1.3Theproceduresdefinedherearenotintendedtobeapplicabletonationalstandardizinglaboratoriesortransferlaboratories.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D2244PracticeforCalculationofColorTolerancesandColorDifferencesfromInstrumentallyMeasuredColorCoordinatesE29PracticeforUsingSignificantDigitsinTestDatatoDetermineConformancewithSpecificationsE284TerminologyofAppearance2.2ISOStandards:3ISO9001QualityManagementSystems—RequirementsISO/IEC17025GeneralRequirementsfortheCompetenceofCalibrationandTestingLaboratories2.3OtherStandard:4QS9000QualitySystemsRequirementsChryslerCorporation,FordMotorCompany,GeneralMotorsCor-poration3.Terminology3.1Definitions:Fordefinitionsoftermsusedinthisstan-dardrefertoTerminologyE284.3.2DefinitionsofTermsSpecifictoThisStandard:3.2.1uncertainty,n—aparameterassociatedwithamea-surementresultortestresultthatreasonablycharacterizesthedispersionofresultsattributabletothepa...
