Designation:F2544−11AnAmericanNationalStandardStandardTestMethodforDeterminingA-WeightedSoundPowerLevelofCentralVacuumPowerUnits1ThisstandardisissuedunderthefixeddesignationF2544;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1ThistestmethodcalculatestheoverallA-weightedsoundpowerlevelemittedbycentralvacuumpowerunits,intendedforoperationindomesticapplications.Thisstandardappliestothepowerunitonlyatthepowerunitlocation.Totestthesoundpowerlevelofacentralvacuumattheuser’slocation,refertoTestMethodF1334.1.2A-weightedsoundpressuremeasurementsareper-formedonamountedcentralvacuumpowerunitinasemi-reverberantroom.Thistestmethoddeterminessoundpowerbyacomparisonmethodforsmallnoisesources,thatis,compari-sontoabroadbandreferencesoundsource.1.3ThistestmethoddescribesaprocedurefordeterminingtheA-weightedsoundpowerlevelofsmallnoisesources.Thistestmethodusesanon-specialsemi-reverberantroom.1.4ResultsareexpressedasA-weightedsoundpowerlevelindecibels(referencedto1pW).1.5Thevaluesstatedininchpoundunitsaretoberegardedasthestandard.Thevaluesinparenthesesareforinformationonly.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2C634TerminologyRelatingtoBuildingandEnvironmentalAcousticsE177PracticeforUseoftheTermsPrecisionandBiasinASTMTestMethodsE691PracticeforConductinganInterlaboratoryStudytoDeterminethePrecisionofaTestMethodF820TestMethodforMeasuringAirPerformanceCharac-teristicsofCentralVacuumCleaningSystemsF1334TestMethodforDeterminingA-WeightedSoundPowerLevelofVacuumCleaners2.2ANSIStandards:3S1.10MethodfortheCalibrationofMicrophonesS1.26Met...
