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BS EN 61280-4-1-2004 纤维光学通信子系统试验程序.光缆设施和链路.多模光缆设施衰减测量

作者:标准资料网 时间:2024-05-10 18:24:08  浏览:9280   来源:标准资料网
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【英文标准名称】:Fibre-opticcommunicationsubsystemtestprocedures-Cableplantandlinks-Multimodefibreopticcableplantattenuationmeasurement
【原文标准名称】:纤维光学通信子系统试验程序.光缆设施和链路.多模光缆设施衰减测量
【标准号】:BSEN61280-4-1-2004
【标准状态】:作废
【国别】:英国
【发布日期】:2004-07-09
【实施或试行日期】:2004-07-09
【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】:电缆;衰减因子;纤维光学;光波导;光学;测量;衰减常数;精密度;衰减;电缆设备;多模纤维;电信;装置;电气工程;试验
【英文主题词】:Attenuationconstant;Attenuationfactors;Attenuations;Cableplants;Cables;Electricalengineering;Fibreoptics;Installations;Measurement;Multimodefibres;Opticalwaveguides;Optics;Precision;Telecommunications;Testing
【摘要】:ThispartofIEC61280establishespreferredmeasurementprinciplesandpracticestoassurethatmeaningfuldatadescribingtheopticallossperformanceofinstalledcableplantscanbeobtained.Itisnotintendedforcomponenttesting,nordoesitdefinethoseelementsofaninstallationthatneedtobemeasured.Establishmentofrequirementsforinstallation,maintenance,repairorconformancetestingislefttothespecifierofthistestmethod.ThisprocedureisaspecifictestassociatedwithIEC61281-1.Thisprocedurecanbeusedtomeasuretheopticallossbetweenanytwopassivelyconnectedpoints,includingendterminations,ofamultimodeopticalfibrecableplant.Theopticalfibrecableplant,asthetermisusedhere,mayconsistofopticalfibrecables,connectors,mountingpanels,jumpercables,andotherpassivecomponents,butmaynotincludeactivecomponents.AnexampleofacableplantcouldbeaportionofaLED(lightemittingdiode)-basedlocalareanetwork.Thiscouldincludeopticalswitchesorcouplers,butwouldexcludegainelementsintheconnectedpath.Theaccuracyofthistestmethoddependsuponproperselectionofthetestmethodscontainedhereinandotherfactors.RefertoAnnexBforadditionalinformation.Thistestmethodutilizestestjumperstofacilitateafieldmeasurementthatincludesalllosselementswithinthecableplant.Itmay,thereforedependingonthemethodchosen,includeconnectionlossesthatdonotappearinmethodBofIEC60793-1-40-insertionlosstechnique(forfibres).Forguidanceinselectingamethod,refertoAnnexB.
【中国标准分类号】:M33
【国际标准分类号】:33_180_10
【页数】:22P.;A4
【正文语种】:英语


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【英文标准名称】:Plastics-Determinationoftheviscosityofpolymersindilutesolutionusingcapillaryviscometers-Poly(vinylchloride)resins
【原文标准名称】:塑料.用毛细粘度计测定稀释溶液中聚合物的粘度值.聚氯乙烯树脂
【标准号】:BSENISO1628-2-2000
【标准状态】:现行
【国别】:英国
【发布日期】:2000-04-15
【实施或试行日期】:2000-04-15
【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】:试验条件;化学分析和试验;变换;催化剂;高聚物;试验设备;精密度;分子量;单体;均聚物;塑料;共聚物;粒状材料;聚氯乙烯;乳化剂;塑料和橡胶技术;粘度测量;污染物;浓度(化学);粘度计;聚合;毛细管;氯乙烯
【英文主题词】:Determination;Dilution;Measurement;Measuringtechniques;Plastics;Polymers;Polyvinylchloride;Resins;Solutions;Solvents;Testing;Vinylchloride;Viscometers;Viscosity;Viscositynumbers
【摘要】:ThispartofISO1628specifiesconditionsforthedeterminationofthereducedviscosity(alsoknownasviscositynumber)andK-valueofPVCresins.Itisapplicabletoresinsinpowderformwhichconsistofhomopolymersofthemonomervinylchlorideandcopolymers,terpolymers,etc.,ofvinylchloridewithoneormoreothermonomers,butwherevinylchlorideisthemainconstituent.Theresinsmaycontainsmallamountsofunpolymerizedsubstances(e.g.emulsifyingorsuspendingagents,catalystresidues,etc.)andothersubstancesaddedduringthecourseofthepolymerization.ThispartofISO1628isnotapplicable,however,toresinshavingavolatile-mattercontentinexcessof0,5%±0,1%,whendeterminedinaccordancewithISO1269.Inadditiontothis,itisnotapplicabletoresinswhicharenotentirelysolubleincyclohexanone.ThereducedviscosityandK-valueofaparticularresinarerelatedtoitsmolecularmass,buttherelationshipvariesdependingontheconcentrationandtype(s)ofothermonomer(s)present.HencehomopolymersandcopolymershavingthesamereducedviscosityorK-valuemaynothavethesamemolecularmass.ThevaluesdeterminedforreducedviscosityandK-value,foraparticularsampleofPVCresin,areinfluenceddifferentlybytheconcentrationofthesolutionchosenforthedetermination.HencetheuseoftheproceduresdescribedinthispartofISO1628willonlygivevaluesforreducedviscosityandK-valuethatarecomparablewhentheconcentrationsofthesolutionsusedareidentical.LimitingviscositynumberisnotusedforPVCresins.TheexperimentalproceduresdescribedinthispartofISO1628canalsobeusedtocharacterizethepolymericfractionobtainedduringthechemicalanalysisofaPVCcomposition.However,thevaluescalculatedforthereducedviscosityandK-valueinthesecircumstancesmaynotindicatetheactualvaluesfortheresinusedtoproducethecompositionbecauseoftheimpurenatureoftherecoveredpolymerfraction.
【中国标准分类号】:G31
【国际标准分类号】:83_080_20
【页数】:24P;A4
【正文语种】:英语


【英文标准名称】:Implantsforsurgery-Wearoftotalknee-jointprostheses-Part3:Loadinganddisplacementparametersforwear-testingmachineswithdisplacementcontrolandcorrespondingenvironmentalconditionsfortest
【原文标准名称】:外科植入物.全膝关节假肢的磨损.第3部分:带位移控制和相应试验环境条件的磨损试验机用负载和位移参数
【标准号】:ISO14243-3TechnicalCorrigendum1-2006
【标准状态】:现行
【国别】:国际
【发布日期】:2006-02
【实施或试行日期】:
【发布单位】:国际标准化组织(ISO)
【起草单位】:ISO/TC150
【标准类型】:()
【标准水平】:()
【中文主题词】:磨蚀试验;位移;环境条件;关节;连接件(活接头);膝关节;膝;负荷;材料试验机;材料;医疗设备;医学科学;参数;特性;修复装置;额定值;外科学;外科植入物;试验;磨损
【英文主题词】:Abrasiontests;Displacement;Displacements;Environmentalcondition;Implants(surgical);Joints(anatomy);Joints(articulations);Kneejoint;Knees;Loading;Materialtestingmachines;Materials;Medicalequipment;Medicalsciences;Parameters;Properties;Prostheticdevices;Ratings;Surgery;Surgicalimplants;Testing;Wear
【摘要】:ThisstandardisImplantsforsurgery-Wearoftotalknee-jointprostheses-Part3:Loadinganddisplacementparametersforwear-testingmachineswithdisplacementcontrolandcorrespondingenvironmentalconditionsfortest
【中国标准分类号】:C35
【国际标准分类号】:11_040_40
【页数】:1P.;A4
【正文语种】:英语



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