Designation:G183−15StandardPracticeforFieldUseofPyranometers,PyrheliometersandUVRadiometers1ThisstandardisissuedunderthefixeddesignationG183;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticedescribesdeploymentconditions,mainte-nancerequirements,verificationproceduresandcalibrationfrequenciesforuseofpyranometers,pyrheliometersandUVradiometersinoutdoortestingenvironments.Thispracticealsodiscussestheconditionsthatdictatethelevelofaccuracyrequiredforinstrumentsofdifferenttypes.1.2WhilebothpyranometersandUVradiometersmaybeemployedindoorstomeasurelightradiationsources,themeasurementofultravioletandlightradiationinacceleratedweatheringenclosuresusingmanufacturedlightsourcesgen-erallyrequiresspecializedradiometricinstruments.UseofradiometricinstrumentationtomeasurelaboratorylightsourcesiscoveredinISO9370.NOTE1—AnASTMstandardthatissimilartoISO9370isunderdevelopmentanddealswiththeinstrumentaldeterminationofirradianceandradiantexposureinweatheringtests.1.3Thecharacterizationofradiometersisoutsidethescopeoftheactivitiesrequiredofusersofradiometers,ascontem-platedbythisstandard.2.ReferencedDocuments2.1ASTMStandards:2E772TerminologyofSolarEnergyConversionG7PracticeforAtmosphericEnvironmentalExposureTest-ingofNonmetallicMaterialsG24PracticeforConductingExposurestoDaylightFilteredThroughGlassG90PracticeforPerformingAcceleratedOutdoorWeather-ingofNonmetallicMaterialsUsingConcentratedNaturalSunlightG113TerminologyRelatingtoNaturalandArtificialWeath-eringTestsofNonmetallicMaterials2.2ISOStandards:3ISO877Plastics—MethodsofExposuretoDirectWeathering,IndirectWeatheringUsingGlass-FilteredDaylightandIndirectWeatheringbyDaylightUsingFresnelMirrorsISO9060SolarEnergy—SpecificationandClassificationofInstrumentsforMeasuringHemisphericalSolarandDi-rectSolarRadiat...
