ElectroMagnetic Compatibility and Radio Spectrum Matters (ERM); Ground-based VHF hand-held, mobile and fixed radio transmitters, receivers and transceivers for the VHF aeronautical mobile service using amplitude modulation; Technical characteristics and methods of measurement

REN/ERM-RP05-014

Elektromagnetna združljivost in zadeve v zvezi z radijskim spektrom (ERM) – Talni VHF ročni, mobilni in fiksni radijski oddajniki, sprejemniki in sprejemniki-oddajniki za VHF aeronavtično mobilno storitev, ki uporablja amplitudno modulacijo – Tehnične karakteristike in merilne metode

General Information

Status
Published
Publication Date
17-May-2000
Technical Committee
Current Stage
12 - Completion
Due Date
05-May-2000
Completion Date
18-May-2000
Standard
EN 300 676 V1.2.1:2003
English language
45 pages
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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.SUHMHPQLNLRGGDMQLNLElectroMagnetic Compatibility and Radio Spectrum Matters (ERM); Ground-based VHF hand-held, mobile and fixed radio transmitters, receivers and transceivers for the VHF aeronautical mobile service using amplitude modulation; Technical characteristics and methods of measurement49.090On-board equipment and instruments33.100.01Elektromagnetna združljivost na splošnoElectromagnetic compatibility in general33.060.20Sprejemna in oddajna opremaReceiving and transmitting equipmentICS:Ta slovenski standard je istoveten z:EN 300 676 Version 1.2.1SIST EN 300 676 V1.2.1:2003en01-december-2003SIST EN 300 676 V1.2.1:2003SLOVENSKI
STANDARD
ETSIEN300676V1.2.1(2000-05)EuropeanStandard(Telecommunicationsseries)ElectromagneticcompatibilityandRadiospectrumMatters(ERM);Ground-basedVHFhand-held,mobileandfixedradiotransmitters,receiversandtransceiversfortheVHFaeronauticalmobileserviceusingamplitudemodulation;TechnicalcharacteristicsandmethodsofmeasurementSIST EN 300 676 V1.2.1:2003

ETSIETSIEN300676V1.2.1(2000-05)2ReferenceREN/ERM-RP05-014Keywordsaeronautical,AM,DSB,radio,testing,VHFETSI650RoutedesLuciolesF-06921SophiaAntipolisCedex-FRANCETel.:+33492944200Fax:+33493654716SiretN°34862356200017-NAF742CAssociationàbutnonlucratifenregistréeàlaSous-PréfecturedeGrasse(06)N°7803/88ImportantnoticeIndividualcopiesofthepresentdocumentcanbedownloadedfrom:http://www.etsi.orgThepresentdocumentmaybemadeavailableinmorethanoneelectronicversionorinprint.Inanycaseofexistingorperceiveddifferenceincontentsbetweensuchversions,thereferenceversionisthePortableDocumentFormat(PDF).Incaseofdispute,thereferenceshallbetheprintingonETSIprintersofthePDFversionkeptonaspecificnetworkdrivewithinETSISecretariat.Usersofthepresentdocumentshouldbeawarethatthedocumentmaybesubjecttorevisionorchangeofstatus.InformationonthecurrentstatusofthisandotherETSIdocumentsisavailableathttp://www.etsi.org/tb/status/Ifyoufinderrorsinthepresentdocument,sendyourcommentto:editor@etsi.frCopyrightNotificationNopartmaybereproducedexceptasauthorizedbywrittenpermission.Thecopyrightandtheforegoingrestrictionextendtoreproductioninallmedia.©EuropeanTelecommunicationsStandardsInstitute2000.Allrightsreserved.SIST EN 300 676 V1.2.1:2003

ETSIETSIEN300676V1.2.1(2000-05)3ContentsIntellectualPropertyRights.7Foreword.7Introduction.71Scope.82References.83Definitionsandabbreviations.83.1Definitions.83.2Abbreviations.94Generalrequirements.94.1Controlsandindicators.94.2Classofemissionandmodulationcharacteristics.104.3Warmup.105Testconditions,powersourcesandambienttemperatures.105.1Normalandextremetestconditions.105.2Testpowersource.105.3Normaltestconditions.105.3.1Normaltemperatureandhumidity.105.3.2Normalpowersources.115.3.2.1Mainsvoltageandfrequency.115.3.2.2Regulatedlead-acidbatterypowersourcesusedonvehicles.115.3.2.3Otherpowersources.115.4Extremetestconditions.115.4.1Extremetemperatures.115.4.2Extremevaluesoftestpowersources.115.4.2.1Mainsvoltage.115.4.2.2Otherpowersources.115.5Performancetest.125.6Environmentaltests.125.6.1General.125.6.2Procedurefortestsatextremetemperatures.125.6.3Temperaturetests.135.6.3.1Hightemperature.135.6.3.2Lowtemperature.136Generalconditionsofmeasurement.136.1Receivertestsignalarrangement.136.1.1Testsignalsources.136.1.2Nominalfrequency.136.1.3Normaltestsignal.136.1.4Squelch.136.1.5Normalaudiooutputpower.146.1.6AudioAGC.146.2Transmittertestsignalarrangement.146.2.1Coaxialtermination.146.2.2Signalsources.146.2.3Normaltestsignal.146.3Testchannels.147Transmitter.147.1Protectionofthetransmitter.147.1.1Definition.147.1.2Methodofmeasurement.147.1.3Requirement.15SIST EN 300 676 V1.2.1:2003

ETSIETSIEN300676V1.2.1(2000-05)47.2Frequencyerror.157.2.1Definition.157.2.2Methodofmeasurement.157.2.3Limits.157.3Carrierpower.157.3.1Definitions.157.3.2Methodofmeasurement.157.3.3Tolerances.167.3.3.1Normaltestconditions.167.3.3.2Extremetestconditions.167.4Amplitudemodulationcharacteristic.167.4.1Modulationdepth(speech).167.4.1.1Definitions.167.4.1.2Methodofmeasurement.167.4.1.3Limits.167.4.1.4Modulationdepth(datamode).167.4.1.5Methodofmeasurement.167.4.1.6Limits.167.4.2Modulationcompression(speechmode).177.4.2.1Definition.177.4.2.2Methodofmeasurement.177.4.2.3Limits.177.4.3Amplitudemodulationdistortion.177.4.3.1Definition.177.4.3.2Methodofmeasurement.177.4.3.3Limits.177.4.4Audiofrequencyresponse.187.4.4.1Definition.187.4.4.2Methodofmeasurement.187.4.4.3Limits8,33kHzchannelspacing.187.4.4.4Limits25kHzchannelspacing.187.4.5Groupdelayvariation(datamodeonly).197.4.5.1Definition.197.4.5.2Transmittermethodofmeasurement.197.4.5.3Limits.197.5Adjacentchannelpower.207.5.1Definition.207.5.2Measurement.207.5.3Limits.207.6Broadbandnoisemeasurement.207.6.1Definition.207.6.2Methodofmeasurement.217.6.3Limit.217.7Conductedspuriousemissions.227.7.1Definition.227.7.2Methodofmeasurement.227.7.3Limits.227.8Intermodulationattenuation.237.8.1Definition.237.8.2Methodofmeasurement.237.8.3Limits.237.9RFpowerattacktimeandreleasetime.247.9.1Definitions.247.9.2Methodofmeasurement.247.9.2.1Attacktime.247.9.2.2Releasetime.257.9.3Limits.257.10KeyingTransientfrequencybehaviorofthetransmitter.257.10.1Definitions.257.10.2Methodofmeasurement.26SIST EN 300 676 V1.2.1:2003

ETSIETSIEN300676V1.2.1(2000-05)57.10.3Limits.268Receiver.268.1Sensitivity.268.1.1Definition.268.1.2Methodofmeasurement.278.1.3Limits.278.2Harmonicdistortion.278.2.1Definition.278.2.2Methodofmeasurement.278.2.3Limits.278.3Audiofrequencyresponse.288.3.1Definition.288.3.2Methodofmeasurement.288.3.3Limits.288.3.4LimitforACARSOperation.288.4Audionoise.288.4.1Definition.288.4.2Methodofmeasurement.288.4.3Limits.288.5EffectiveAcceptanceBandwidth.298.5.1Definition.298.5.2MethodofMeasurement.298.5.3Limits.298.6Adjacentchannelrejection.298.6.1Definition.298.6.2Methodofmeasurement.298.6.3Limits.308.7Spuriousresponserejection.308.7.1Definition.308.7.2Introductiontothemethodofmeasurement.308.7.3Methodofsearchofthelimitedfrequencyrange.318.7.4Methodofmeasurement.318.7.5Limit.318.8Intermodulationresponserejection.318.8.1Definition.318.8.2Methodofmeasurement.328.8.3Limit.328.9Blockingordesensitization.328.9.1Definition.328.9.2Methodofmeasurement.338.9.3Limit.338.10Conductedspuriousemissions.338.10.1Definition.338.10.2Methodofmeasuringthepowerlevel.338.10.3Limits.348.11Squelchoperation.348.11.1Definition.348.11.2Methodofmeasurement.348.11.3Limits.358.12Crossmodulationrejection.358.12.1Definition.358.12.2Methodofmeasurement.358.12.3Limits.368.13Receiverdynamicrange.368.13.1Definition.368.13.2Methodofmeasurement.368.13.3Limit.368.14AGCattacktimeandreleasetime(datamodeonly).368.14.1Definitions.368.14.2Methodofmeasurement.36SIST EN 300 676 V1.2.1:2003

ETSIETSIEN300676V1.2.1(2000-05)68.14.2.1Attacktime.368.14.2.2AGCDecaytime.378.14.3Limits.378.15AFAGC.378.15.1Definition.378.15.2MethodofMeasurement.378.15.3Limit.378.16Groupdelayvariation(datamodeonly).388.16.1Definition.388.16.2Receivermethodofmeasurement.388.16.3Limits.389Measurementuncertaintyandinterpretationofthemeasuredresults.399.1Maximummeasurementuncertainties.399.2Interpretationofthemeasurementresults.40AnnexA(normative):Auxiliarycables.41AnnexB(normative):Specificationforadjacentchannelpowermeasurementarrangements.42B.1Powermeasuringreceiverspecification.42B.1.1IFfilter.42B.1.2Attenuationindicator.43B.1.3RMSvalueindicator.43B.1.4Oscillatorandamplifier.43Bibliography.44History.45SIST EN 300 676 V1.2.1:2003

ETSIETSIEN300676V1.2.1(2000-05)7IntellectualPropertyRightsIPRsessentialorpotentiallyessentialtothepresentdocumentmayhavebeendeclaredtoETSI.TheinformationpertainingtotheseessentialIPRs,ifany,ispubliclyavailableforETSImembersandnon-members,andcanbefoundinSR000314:"IntellectualPropertyRights(IPRs);Essential,orpotentiallyEssential,IPRsnotifiedtoETSIinrespectofETSIstandards",whichisavailablefromtheETSISecretariat.LatestupdatesareavailableontheETSIWebserver(http://www.etsi.org/ipr).PursuanttotheETSIIPRPolicy,noinvestigation,includingIPRsearches,hasbeencarriedoutbyETSI.NoguaranteecanbegivenastotheexistenceofotherIPRsnotreferencedinSR000314(ortheupdatesontheETSIWebserver)whichare,ormaybe,ormaybecome,essentialtothepresentdocument.ForewordThisEuropeanStandard(Telecommunicationsseries)hasbeenproducedbyETSITechnicalCommitteeElectromagneticcompatibilityandRadiospectrumMatters(ERM).NationaltranspositiondatesDateofadoptionofthisEN:21April2000DateoflatestannouncementofthisEN(doa):31July2000DateoflatestpublicationofnewNationalStandardorendorsementofthisEN(dop/e):31January2001DateofwithdrawalofanyconflictingNationalStandard(dow):31January2001IntroductionThepresentdocumentstatestheminimumperformancerequirementsforgroundbasedradiotransmitters,transceiversandreceiversfortheaeronauticalmobileserviceoperatingintheVHFband(118MHzto136,975MHz),usingDoubleSidebandAmplitudeModulationwith8,33kHzor25kHzchannelspacing.Thepresentdocumentmaybeusedbyaccreditedtestlaboratoriesfortheassessmentoftheperformanceoftheequipment.Theperformanceoftheequipmentsubmittedfortypetestingshouldberepresentativefortheperformanceofthecorrespondingproductionmodel.Thepresentdocumenthasbeenwrittenontheassumptionthat:-thetypetestmeasurementswillbeperformedonlyonce,inanaccreditedtestlaboratoryandthemeasurementsacceptedbythevariousauthoritiesinordertogranttypeapproval;-ifequipmentavailableonthemarketisrequiredtobecheckeditwillbetestedinaccordancewiththemethodsofmeasurementspecifiedinthepresentdocument.SIST EN 300 676 V1.2.1:2003

ETSIETSIEN300676V1.2.1(2000-05)81ScopeThepresentdocumentstatestheminimumperformancerequirementsforradiotransmittersreceiversandtransceiversatground-basedaeronauticalstationsoperatingintheVHFband(118MHzto136,975MHz)allocatedtotheaeronauticalmobileservice.ThepresentdocumentappliestoDSBAMsystems,withchannelseparationsof8,33kHzor25kHzintendedforanaloguespeechandgroundbasestationswithachannelspacingof25kHzintendedforACARSdatacommunication.Thescopeofthepresentdocumentislimitedtogroundbasestations,groundmobileandhandheldradiosforgrounduse.2ReferencesThefollowingdocumentscontainprovisionswhich,throughreferenceinthistext,constituteprovisionsofthepresentdocument.• Referencesareeitherspecific(identifiedbydateofpublication,editionnumber,versionnumber,etc.)ornon-specific.• Foraspecificreference,subsequentrevisionsdonotapply.• Foranon-specificreference,thelatestversionapplies.• Anon-specificreferencetoanETSshallalsobetakentorefertolaterversionspublishedasanENwiththesamenumber.[1]ETSIETR028:"RadioEquipmentandSystems(RES);Uncertaintiesinthemeasurementofmobileradioequipmentcharacteristics".[2]ICAOAnnex10VolumeV(1996):"AeronauticalRadioFrequencySpectrumUtilization".[3]ITU-TRecommendationP.53:"Psophometerforuseontelephone-typecircuits".[4]ISO7637Roadvehicles,Electricaldisturbancebyconductingandcoupling(Parts1&2).3Definitionsandabbreviations3.1DefinitionsForthepurposesofthepresentdocument,thefollowingtermsanddefinitionsapply:Typesofmeasurements:conductedmeasurements:measurementswhicharemadeusingadirectRFconnectiontotheequipmentundertestradiatedmeasurements:measurementswhichinvolvethemeasurementofaradiatedfieldaeronauticalmobileservice:mobileservicebetweenaeronauticalstationsandaircraftstations,orbetweenaircraftstations,inwhichsurvivalcraftstationsmayparticipateTypeofstation:groundbasestation:aeronauticalstationequipment,intheaeronauticalmobileservice,forusewithanexternalantennaandintendedforuseatafixedlocationmobilestation:radioequipmentdesignedforpermanentortemporaryvehicleinstallationandoperation,includingprovisionforvehicleDCpowersupply,andconnectionsforexternalantenna,PTTkey,microphone,speakerand/orheadphoneSIST EN 300 676 V1.2.1:2003

ETSIETSIEN300676V1.2.1(2000-05)9portablestation:radioequipmentwithintegralbatteryforindependenthand-carrieduse.Provisionsmaybemadeforconnectionsofanexternalantenna,PTTkey,microphone,headphoneandcharger,butprincipallytobeoperatedasaselfcontainedunithandheld:radioequipmentwithintegralbatteries,designedtobehandportableandoperatedhandheldintegralantennaequipment:radiocommunicationsequipmentwithanantennaintegratedintotheequipmentwithouttheuseofanexternalconnectorandconsideredtobepartoftheequipment.Anintegralantennamaybeinternalorexternaltotheequipment.Inequipmentofthistype,a50ΩRFconnectionpointshallbeprovidedfortestpurposes.AconnectionpointforanAFmodulatinginputandforAFoutputmeasurementsshallalsobeprovidednon-integralantennaequipment:radiocommunicationsequipmentwithaconnectorintendedforconnectiontoanantenna3.2AbbreviationsForthepurposesofthepresentdocument,thefollowingabbreviationsapply:ACARSAircraftCommunicationsAddressingandReportingSystemAFAudioFrequencyAGCAutomaticGainControlAMAmplitudeModulationdBcdBrelativetothecarrierpowerDSBDoubleSideBandI/PInputICAOInternationalCivilAviationOrganizationIFIntermediateFrequencyO/POutputppmpartspermillionRFRadioFrequencyrmsrootmeansquareSINAD(Signal+Noise+Distortion)/(Noise+Distortion)VSWRVoltageStandingWaveRatio4Generalrequirements8,33kHzequipmentshallbeabletooperateonallchannelsintheListofAssignableFrequenciesdefinedinAppendix2,chapter4,GroupF(subclause4.1.8.1.2)oftheICAOAnnex10VolumeV[2].Thechannellabellingusedfor8,33kHzchannelspacingisbasedonafrequency-channelpairinginaccordancewithtable4.1(bis)ofICAOAnnex10VolumeV[2]subclause4.1.2.4.25kHzequipmentshallbeabletooperateonthefrequencies118,0MHzto136,975MHzinaccordancewithICAOAnnex10VolumeV[2],AppendixtoChapter4.Itshallnotbepossibletotransmitwhileanyfrequencysynthesizerusedwithinthetransmitterisoutoflock.Itshallnotbepossibletotransmitduringchannelswitchingoperations.4.1ControlsandindicatorsTheequipmentshallhavethefollowingcontrolsandindicatorsasaminimum:-avisualindicationthatthedeviceisswitchedon;-afacilitytodisablethesquelchfortestpurposes;-avisualindicationthatthecarrierisbeingproduced.SIST EN 300 676 V1.2.1:2003

ETSIETSIEN300676V1.2.1(2000-05)10Theequipmentshallalsomeetthefollowingrequirements:-theusershallnothaveaccesstoanycontrolwhich,ifwronglyset,mightimpairthetechnicalcharacteristicsoftheequipment.4.2ClassofemissionandmodulationcharacteristicsTheequipmentshalluseDoubleSideBand(DSB)AmplitudeModulation(AM)fullcarrier,(6K80A3EJNfor25kHz,5K00A3EJNfor8,33kHz),forspeechand13k0A2Dfordata.Theequipmentshallbedesignedtooperatesatisfactorilywithachannelseparationof8,33kHzor25kHz.4.3WarmupAfterbeingswitchedontheequipmentshallbeoperationalwithinfiveseconds(tensecondsforhandheldradios)andshallmeettherequirementsofthepresentdocumentwithinoneminuteundernormaltestconditions(subclause5.3).Iftheequipmentincludespartswhichrequiretobeheatedinordertooperatecorrectly(e.g.crystalovens)awarming-upperiodof30minutesofthosepartsshallbeallowed.5Testconditions,powersourcesandambienttemperatures5.1NormalandextremetestconditionsMeasurementsshallbemadeundernormaltestconditions(subclause5.3)andalso,wherestated,underextremetestconditions(subclauses5.4.1and5.4.2appliedsimultaneously).5.2TestpowersourceDuringtesting,theequipmentshallbesuppliedfromatestpowersourcecapableofproducingnormalandextremetestvoltages.Theinternalimpedanceofthetestpowersourceshallbelowenoughforitseffectonthetestresultstobenegligible.Forthepurposeoftestingthepowersourcevoltageshallbemeasuredattheinputterminalsoftheequipment.Duringtesting,thepowersourcevoltagesshallbemaintainedwithinatoleranceof±3%relativetothevoltagelevelatthebeginningofeachtest.5.3Normaltestconditions5.3.1NormaltemperatureandhumidityThenormaltemperatureandhumidityconditionsfortestsshallbeacombinationoftemperatureandhumiditywithinthefollowingranges:-temperature:+15°Cto+35°C;-relativehumidity:20%to75%.Whenitisimpracticabletocarryoutthetestsundertheseconditions,anotetothiseffect,statingtheambienttemperatureandrelativehumidityduringthetests,shallbeaddedtothetestreport.SIST EN 300 676 V1.2.1:2003

ETSIETSIEN300676V1.2.1(2000-05)115.3.2Normalpowersources5.3.2.1MainsvoltageandfrequencyThenormaltestvoltageforequipmenttobeconnectedtothemainsshallbethenominalmainsvoltage.Forthepurposeofthepresentdocument,thenominalvoltageshallbethedeclaredvoltageoranyofthedeclaredvoltagesforwhichtheequipmentwasdesigned.ThefrequencyofthetestpowersourcecorrespondingtotheACmainsshallbebetween49Hzand51Hz.5.3.2.2Regulatedlead-acidbatterypowersourcesusedonvehiclesWhentheradioequipmentisintendedforoperationfromtheusualtypesofregulatedlead-acidbatterypowersourceusedonvehicles,thenormaltestvoltageshallbe1,1timesthenominalvoltageofthebattery(6V,12Vetc.).5.3.2.3OtherpowersourcesForoperationfromotherpowersourcesortypesofbattery(primaryorsecondary),thenormaltestvoltageshallbethatdeclaredbytheequipmentmanufacturer.5.4Extremetestconditions5.4.1ExtremetemperaturesFortestsatextremetemperatures,measurementsshallbemadeinaccordancewithsubclause5.5,atalowertemperatureof-20°Candanuppertemperatureof+55°C.Thistestshallbeperformedatthenominalsupplyvoltageasdefinedinsubclause5.3.25.4.2Extremevaluesoftestpowersources5.4.2.1MainsvoltageTheextremetestvoltagesshallbebetween207Vand253V.Thistestshallbeperformedatthenormaltemperatureandhumidityasdefinedinsubclause5.3.1.Thefrequencyofthetestvoltageshallbebetween49Hzand51Hz.5.4.2.2OtherpowersourcesForequipmentusingotherpowersources,orcapableofbeingoperatedfromavarietyofpowersources,theextremetestvoltagesshallbethoseagreedbetweentheequipmentmanufacturerandthetestinglaboratoryandshallberecordedinthetestreport.EquipmentintendedforvehicleinstallationshallmeetthepowersupplyrequirementsofISO7637[4].SIST EN 300 676 V1.2.1:2003

ETSIETSIEN300676V1.2.1(2000-05)125.5PerformancetestForthepurposesofthepresentdocument,theterm"performancetest"shallbetakentomeanthefollowingmeasurementsandlimits:-forthetransmitter:-frequencyerror:withthetransmitterconnectedtoacoaxialtermination(subclause6.2.1),thefrequencyerrorshallbeasinsubclause7.2;-carrierpower:withthetransmitterconnectedtoacoaxialtermination(subclause6.2.1),thetransmittershallbekeyedwithoutmodulationandtheoutputpowershallbeasdefinedinsubclause7.3;-modulation:withthetransmitterconnectedtoacoaxialtermination(subclause6.2.1),thetransmittershallbekeyed.Themodulationdistortionshallbeasinsubclause7.4.3;-forthereceiver:-sensitivity:withtheAGCoperative,anormaltestsignal(subclause6.1.3)shallbeappliedtothereceiver.Thesensitivityshallbeasdefinedinsubclause8.1.5.6Environmentaltests5.6.1GeneralEnvironmentaltestsshallfollowcheckingtheprotectionofthetransmitter(subclause7.1)whichfollowsthefirstapplicationofthePerformancetest(subclause5.5).5.6.2ProcedurefortestsatextremetemperaturesBeforetestsattheupperextremetemperature,theequipmentshallbeplacedinthetestchamberandleftuntilthermalbalanceisattained.Theequipmentshallthenbeswitchedonfor30minutes.Thetransmittershallthenbekeyedfor1minuteinthetransmitcondition,afterwhichtheequipmentshallmeetthespecifiedrequirements.Transmittersshallbeoperatedinthehighestratedpowertransmitcondition.Fortestsatthelowerextremetemperature,theequipmentshallbeleftinthetestchamberuntilthermalbalanceisattained,thenswitchedtothestandbyorreceiveconditionfor1minuteafterwhichtheequipmentshallmeetthespecifiedrequirements.NOTE:Itisassumedthatequipmentintendedforoff-setcarrieroperationwillbeinstalledinabuildingwithfacilitiessuitabletoprovideprotectionfromtemperatureextremes,thereforeextremetemperaturetestsneednotbeappliedtosuchequipment.SIST EN 300 676 V1.2.1:2003

ETSIETSIEN300676V1.2.1(2000-05)135.6.3Temperaturetests5.6.3.1Hightemperature-Placetheequipmentinachamberandheatto55ºC(±3ºC)andallowtostabilizefor1hour.-Switchontheequipment.-After30minutescarryouttheperformancetestasdetailedinsubclause5.5.-Switchofftheequipmentandallowthechambertocooltoroomtemperatu
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