Designation:D4356–84(Reapproved2002)AnAmericanNationalStandardStandardPracticeforEstablishingConsistentTestMethodTolerances1ThisstandardisissuedunderthefixeddesignationD4356;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticeshouldbeusedinthedevelopmentofanytestmethodinwhichthedeterminationvalueiscalculatedfrommeasurementvaluesbymeansofanequation.Thepracticeisnotapplicabletosuchdeterminationvaluesasthosecalculatedfromcountsofnonconformities,ratiosofsuccessestofailures,gradings,orratings.1.2Thepurposeofthispracticeistoprovideguidanceinthespecifyingofrealisticandconsistenttolerancesformakingmeasurementsandforreportingtheresultsoftesting.1.3Thispracticecanbeusedasaguideforobtainingtheminimumtestresulttolerancethatshouldbespecifiedwithaparticularsetofspecifiedmeasurementtolerances,themaxi-mumpermissiblemeasurementtoleranceswhichshouldbespecifiedtoachieveaspecifiedtestresulttolerance,andmoreconsistentspecifiedmeasurementtolerances.1.4Thesemeasurementandtestresulttolerancesarenotstatisticallydeterminedtolerancesthatareobtainedbyusingthetestmethodbutarethetolerancesspecifiedinthetestmethod.1.5Intheprocessofselectingtestmethodtolerances,thetaskgroupdevelopingorrevisingatestmethodmustevaluatenotonlytheconsistencyoftheselectedtolerancesbutalsothetechnicalandeconomicalfeasibilityofthemeasurementtoler-ancesandthesuitabilityofthetestresulttoleranceforthepurposesforwhichthetestmethodwillbeused.Thispracticeprovidesguidanceonlyforestablishingtheconsistencyofthetestmethodtolerances.1.6Thispracticeispresentedinthefollowingsections:NumberScope1ReferencedDocuments2TERMINOLOGYDefinitions3DiscussionofTerms4ExpressingTestMethodTolerances5ToleranceSymbols6SUMMARYANDUSESSummaryofPractice7UsesandSignificance8MATHEMATICALRELATIONSHIPSPropagationEquations9ToleranceTe...
