【英文标准名称】:Cablenetworksfortelevisionsignals,soundsignalsandinteractiveservices-Performancerequirementsforsignalsdeliveredatthesystemoutletinoperation
【原文标准名称】:电视信号、声音信号和交互式设备用电缆网络.运行系统出口信号传输的性能要求
【标准号】:BSEN60728-1-2-2009
【标准状态】:现行
【国别】:英国
【发布日期】:2010-01-31
【实施或试行日期】:2010-01-31
【发布单位】:英国标准学会(GB-BSI)
【起草单位】:BSI
【标准类型】:()
【标准水平】:()
【中文主题词】:天线系统;音频信号;电缆分布系统;电缆电视;电缆电视系统;电缆分配系统;共用天线电视;同轴;同轴电缆;兼容性;定义;电气工程;交互式的;测量;测量技术;性能;性能要求;评定;接收天线;信号传输;声音广播;规范(验收);电视广播;电视传输;电视信号
【英文主题词】:Antennasystems;Audiosignals;Cabledistributionsystems;Cabletelevision;Cabletelevisionsystem;Cableddistributionsystems;CATV;Coaxial;Coaxialcables;Compatibility;Definitions;Electricalengineering;Interactive;Measurement;Measuringtechniques;Performance;Performancerequirements;Ratings;Receptionantennae;Signaltransmission;Soundbroadcasting;Specification(approval);Televisionbroadcasting;Televisiontransmission;Visionsignals
【摘要】:ThispartofIEC60728providestheminimumperformancerequirementstobefulfilledinoperationatthesystemoutletorterminalinputanddescribesthesummationcriteriafortheimpairmentspresentinthereceivedsignalsandthoseproducedbytheCATV/MATV/SMATVcablenetwork,includingindividualreceivingsystems.NOTE1Whenachangeofsignalformatismadeattheheadend,thesummationoftheimpairmentsdoesnotapply(seealsoClause57H7).Inabuildingdividedintoapartmentblocks,thesignalsreceivedbytheantennasaredistributedbytheMATV/SMATVcablenetworkuptothehomenetworkinterface(HNI);thetelevisionsignalsarethendistributed(insidethehome)byhomenetworks(HN)ofvarioustypesuptothesystemoutletorterminalinput.Thecablenetworkcansupporttwowayoperation,fromthesystemoutlet(orterminalinput)towardstheheadend.Thehomenetworkcanusecoaxialcables,balancedpaircables,fibreopticcables(glassorplastic)andalsowirelesslinksinsidearoom(orasmallnumberofadjacentrooms)toreplacewiredcords.ThispartofIEC60728isapplicabletocablenetworksintendedfortelevisionsignals,soundsignalsandinteractiveservicesoperatingbetweenabout5MHzand3000MHz.Thefrequencyrangeisextendedto6000MHzforhomedistributiontechniquesthatreplacewiredcordswithawirelesstwowaycommunicationinsidearoom(orasmallnumberofadjacentrooms)thatusesthe5GHzto6GHzfrequencyband.64H64H64H58HFigure1showsthemainsectionsofageneralCATV/MATV/SMATVsystem,indicatingthepartsoftheIEC60728-1seriesdocumentswheretherelevantperformancerequirementsareindicated.?TherequirementsforthesignalsreceivedattheheadendaregiveninClause6ofIEC60728-1.?TherequirementsfortheCATV/MATV/SMATVcablenetwork,assuminganunimpairedinputsignalattheinputoftheheadend,uptothesystemoutletaregiveninIEC60728-1,Clause5.?TherequirementsfortheCATV/MATV/SMATVcablenetworkuptothehomenetworkinterface(HNI)aregiveninIEC60728-1,Clause7,assuminganunimpairedinputsignalattheinputoftheheadend.?ThespecificrequirementsfromHNItothesystemoutletorterminalinputaregiveninIEC60728-1-1,Clause5,assuminganunimpairedinputsignalattheHNI.?TherequirementsatthesystemoutletinoperationaregiveninClause7ofthisstandard.Theexpression“inoperation”meansthatthereceivedsignals,withtheirimpairments,areappliedtotheheadendinputoftheCATV/MATV/SMATVcablenetwork.Therequirementsatthesystemoutlet“inoperation”arederived,therefore,bysummingtheimpairmentsofthevariouscascadedpartsofthesystemandoftheinputsignal.Whenachangeofsignalformatfromanaloguetoanalogue(e.g.fromFMtoAM-VSB)orfromdigitaltodigital(e.g.fromQPSKtoQAM)orfromdigitaltoanalogue(e.g.fromDVB-S/S2toAM-VSBorDVB-TtoAM-VSB)ismadeattheheadend,thesummationoftheimpairmentsthatproducearelaxationofrequirementsatsystemoutletdoesnotapply.Suchacasewillbetheequivalenceofunimpairedsignalsappliedattheheadendinput.ThereforetherequirementsatsystemoutletgiveninIEC60728-1apply.Thisstandardalsoprovidesreferencesforthebasicmethodsofmeasurementoftheoperationalcharacteristicsofthedownstreamcablenetworkinordertoassessitsperformance.Allrequirementsrefertotheperformancelimitstobeachievedinoperationatanysystemoutletwhenterminatedinaresistanceequaltothenominalloadimpedanceofthesystem,unlessotherwisespecified.Wheresystemoutletsarenotused,theaboveappliestotheterminalinput.
【中国标准分类号】:M60
【国际标准分类号】:33_120_10;33_160_01;35_110
【页数】:38P.;A4
【正文语种】:英语


【英文标准名称】:StandardTestMethodforRubber-CompositionalAnalysisbyThermogravimetry(TGA)
【原文标准名称】:用热重力法对橡胶组成分析的标准试验方法
【标准号】:ASTMD6370-1999(2009)
【标准状态】:现行
【国别】:美国
【发布日期】:1999
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:D11.11
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:ash;carbonblack;filler;oil;organics;plasticizer;polymer;rubber;thermogravimetry;Thermogravimetricanalysis(TGA);Compositionanalysis--rubber;Rubbercompositionalanalysis
【摘要】:Thistestmethodisintendedforuseinqualitycontrol,materialscreening,andrelatedproblemsolvingwhereacompositionalanalysis,orcomparisontoaknownmaterial,isdesired.Theparametersdescribedareguidelinesandmaybealteredtosuittheanalysisofotherrubbercompounds.Thistestmethodisnotsuitableforrubbercompoundscontainingfillermaterialswhichdecomposeinthetemperaturerangeof50to800x00B0;C,forexample,CaCO3,Al(OH)3(3H2O),etc.Analysisofcompoundscontainingfillersofthistyperequiresknowledgeofthefillertypeandsomecorrectionformassloss.1.1Thistestmethodprovidesathermogravimetric(TGA)techniquetodeterminetheamountsoforganics(oil,polymer),carbonblackandash(filler)inarubbercompound.1.2Theamountofplasticizer/oilmaybedeterminedseparatelyusingTestMethodD297.1.3Thistestmethodutilizespreviouslycalibrated,manualorcomputerassistedTGAinstrumentation.1.4ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:G34
【国际标准分类号】:83_060
【页数】:4P.;A4
【正文语种】:英语