Designation:D2520−13StandardTestMethodsforComplexPermittivity(DielectricConstant)ofSolidElectricalInsulatingMaterialsatMicrowaveFrequenciesandTemperaturesto1650°C1ThisstandardisissuedunderthefixeddesignationD2520;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thesetestmethodscoverthedeterminationofrelative(Note1)complexpermittivity(dielectricconstantanddissipa-tionfactor)ofnonmagneticsoliddielectricmaterials.NOTE1—Theword“relative”isoftenomitted.1.1.1TestMethodAisforspecimenspreciselyformedtotheinsidedimensionofawaveguide.1.1.2TestMethodBisforspecimensofspecifiedgeometrythatoccupyaverysmallportionofthespaceinsidearesonantcavity.1.1.3TestMethodCusesaresonantcavitywithfewerrestrictionsonspecimensize,geometry,andplacementthanTestMethodsAandB.1.2Althoughthesemethodsareusedoverthemicrowavefrequencyspectrumfromaround0.5to50.0GHz,eachoctaveincreaseusuallyrequiresadifferentgeneratorandasmallertestwaveguideorresonantcavity.1.3Testsatelevatedtemperaturesaremadeusingspecialhigh-temperaturewaveguideandresonantcavities.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2A893/A893MTestMethodforComplexDielectricConstantofNonmetallicMagneticMaterialsatMicrowaveFre-quenciesD150TestMethodsforACLossCharacteristicsandPermit-tivity(DielectricConstant)ofSolidElectricalInsulationD1711TerminologyRelatingtoElectricalInsulation3.Terminology3.1DefinitionsofTerms.Fordefinitionsoftermsusedinthistestmethod,refertoTerminologyD1711.3.2DefinitionsofTermsSpecifictoThisStandard:3.2.1neper,n—adivisionofthelogarithmicscalewhereinthenumberofnepersisequal...
