【英文标准名称】:Conductorsforoverheadlines-Roundwireconcentriclaystrandedconductors;GermanversionEN50182:2001
【原文标准名称】:架空线导体.圆线共轴布线标准导体
【标准号】:DINEN50182-2001
【标准状态】:现行
【国别】:德国
【发布日期】:2001-12
【实施或试行日期】:2001-12-01
【发布单位】:德国标准化学会(DIN)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:同心;圆导线;绞线;电气工程;规范(验收);架空线导体;定义;试验;名称与符号;架空线;包装件;电线;机械性能;电性能;电性质和电现象
【英文主题词】:
【摘要】:Thedocumentspecifiestheelectricalandmechanicalcharacteristicsofroundwireconcentriclaybareoverheadelectricalconductorsstrandedinalternatedirections,withorwithoutgreaseasperEN50326,madeofoneoracombinationofanyofthefollowing:a)harddrawnAluminiumasperEN60889designatedAL1,b)AluminiumalloyasperEN50183designatedAL2toAL7,c)ZinccoatedsteelwireasperEN50189withgradeandclassdesignatedST1A,ST2B,ST3D,ST4A,ST5EandST6C,d)Aluminium-cladsteelwireasperEN61232withclassdesignation20SA(gradesAandB),27SA,30SAand40SA.#,,#
【中国标准分类号】:F21
【国际标准分类号】:29_060_10
【页数】:72P;A4
【正文语种】:德语


【英文标准名称】:Opticalfibres-Part1-49:Measurementmethodsandtestprocedures-Differentialmodedelay
【原文标准名称】:光学纤维.第1-49部分:测量方法和试验程序.差分模延迟
【标准号】:IEC60793-1-49-2006
【标准状态】:现行
【国别】:国际
【发布日期】:2006-06
【实施或试行日期】:
【发布单位】:国际电工委员会(IX-IEC)
【起草单位】:IEC/SC86A
【标准类型】:()
【标准水平】:()
【中文主题词】:频带宽度;分类;定义;延迟时间;设计;尺寸;分散;电气工程;光纤;梯度纤维;测量;测量技术;单模纤维;多模纤维;光学测量;光波导;光电子学;特性;质量保证;运转时间;运转时间方法;规范;试验;试验装置;传输时差
【英文主题词】:Bandwidths;Classification;Definitions;Delaytime;Design;Dimensions;Dispersion;Documentations;Electricalengineering;Envelopedelay;Fibreoptics;Gradientfibres;Measurement;Measuringtechniques;Monomodefibres;Multimodefibres;Opticalmeasurement;Opticalwaveguides;Optoelectronics;Properties;Qualityassurance;Runningtime;Runningtimemethod;Specification;Testing;Testingdevices;Transittimedeviation
【摘要】:ThispartofIEC60793appliesonlytomultimode,graded-indexglass-core(categoryA1)fibres.Thetestmethodiscommonlyusedinproductionandresearchfacilities,butisnoteasilyaccomplishedinthefield.Thisstandarddescribesamethodforcharacterizingthemodalstructureofagraded-indexmultimodefibre.Thisinformationisusefulforassessingthebandwidthperformanceofafibreespeciallywhenthefibreisintendedtosupportavarietyoflaunchconditionssuchasthoseproducedbystandardizedlasertransmitters.Withthismethod,theoutputfromafibrethatissingle-modeatthetestwavelengthexcitesthemultimodefibreundertest.Theprobespotisscannedacrosstheendfaceofthefibreundertest,andtheopticalpulsedelayisdeterminedatspecifiedoffsetpositions.Tworesultscanbeproducedfromthesamedata.First,thedifferenceinopticalpulsedelaytimebetweenthefastestandslowestmodegroupsofthefibreundertestcanbedetermined.Theuserspecifiestheupperandlowerlimitsofradialoffsetpositionsoverwhichtheprobefibreisscannedinordertospecifydesiredlimitsofmodalstructure.TheDMDdataisthencomparedtoDMDspecificationsthathavebeendeterminedbymodelingandexperimentationtocorrespondtoaminimumEMBforarangeoftransmitters.Second,theopticalpulseshapescanbecombinedusingspecificweightstodetermineacalculatedeffectivemodalbandwidth(EMBc),andbycalculatingasequenceofEMBcvalueswithdifferentsetsofweights,aminimumEMBccanbecalculated,correspondingtoarangeoftransmitters.Thetestquantifiestheeffectsofinteractionsofthefibremodalstructureandthesourcemodalcharacteristicsexcludingthesourcespectralinteractionswithfibrechromaticdispersion.Addingtheeffectsofchromaticdispersionandsourcespectralwidthwillreducetheoveralltransmissionbandwidth,butthisisaseparatecalculationinmosttransmissionmodels.Inthistest,theeffectsofnon-zerospectralwidthareminimizedbutanyresidualeffectswilltendtoincreasetheDMDvalueanddecreasetheEMBcvalue.
【中国标准分类号】:M33
【国际标准分类号】:33_180_10
【页数】:57P.;A4
【正文语种】:英语