Designation:E2311−04(Reapproved2009)StandardPracticeforQCMMeasurementofSpacecraftMolecularContaminationinSpace1ThisstandardisissuedunderthefixeddesignationE2311;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticeprovidesguidanceformakingdecisionsconcerningtheuseofaquartzcrystalmicrobalance(QCM)andathermoelectricallycooledquartzcrystalmicrobalance(TQCM)inspacewherecontaminationproblemsonspacecraftarelikelytoexist.Carefuladherencetothisdocumentshouldensureadequatemeasurementofcondensationofmolecularconstituentsthatarecommonlytermed“contamination”onspacecraftsurfaces.1.2Acorollarypurposeistoprovidechoicesamongtheflight-qualifiedQCMsnowexistingtomeetspecificneeds.1.3ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2E595TestMethodforTotalMassLossandCollectedVola-tileCondensableMaterialsfromOutgassinginaVacuumEnvironmentE1559TestMethodforContaminationOutgassingCharac-teristicsofSpacecraftMaterials2.2U.S.FederalStandards:3MIL-STD-883StandardTestMethod,MicrocircuitsMIL-S-45743Soldering,ManualType,HighReliabilityElectricalandElectronicEquipmentFED-STD-209EAirborneParticulateCleanlinessClassesinCleanroomsandCleanZonesNOTE1—AlthoughFED-STD-209Ehasbeencancelled,itstillmaybeusedanddesignationsinFED-STD-209EmaybeusedinadditiontotheISOdesignations.2.3ISOStandards:4ISO14644-1CleanroomsandAssociatedControlledEnvironments—Part1:ClassificationofAirCleanlinessISO14644-2CleanroomsandAssociatedControlledEnvironments—Part2:Specif...
