Designation:E1709−09StandardTestMethodforMeasurementofRetroreflectiveSignsUsingaPortableRetroreflectometerata0.2DegreeObservationAngle1ThisstandardisissuedunderthefixeddesignationE1709;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversmeasurementoftheretroreflec-tivepropertiesofsignmaterialssuchastrafficsignsandsymbols(verticalsurfaces)usingaportableretroreflectometerthatcanbeusedinthefield.Theportableretroreflectometerisahand-heldinstrumentwithadefinedstandardgeometrythatcanbeplacedincontactwithsignmaterialtomeasuretheretroreflectioninastandardgeometry.Themeasurementscanbecomparedtominimumrequirementstodeterminetheneedforreplacement.EntranceandobservationanglesspecifiedinthistestmethodarethoseusedcurrentlyintheUnitedStatesandmaydifferfromtheanglesusedelsewhereintheworld.1.2Thistestmethodisintendedtobeusedforthefieldmeasurementoftrafficsignsbutmaybeusedtomeasuretheperformanceofmaterialsbeforeplacingthesigninthefieldorbeforeplacingthesignmaterialonthesignface.1.3Thistestmethodcoversmeasurementsata0.2degreeobservationangle.SeeTestMethodE2540formeasurementsata0.5degreeobservationangle.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesandtodeterminetheapplicabilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2E284TerminologyofAppearanceE808PracticeforDescribingRetroreflectionE809PracticeforMeasuringPhotometricCharacteristicsofRetroreflectorsE810TestMethodforCoefficientofRetroreflectionofRetroreflectiveSheetingUtilizingtheCoplanarGeometryE2540TestMethodforMeasurementofRetroreflectiveSignsUsingaPortableRetroreflectometerata0.5DegreeObservationAngle3.Terminology3.1Theterminologyusedi...
