ASTM E 2550-2007 热重分析法测定热稳定性的标准试验方法

上一篇: BS EN 14702-2-2006 淤泥特性.沉降性能.第2部分:增稠性的测定
下一篇: ASTM A 924/A 924M-2007 热浸金属涂层钢薄板一般要求的标准规范

【英文标准名称】:Fibreorganisersandclosurestobeusedinopticalfibrecommunicationsystems.Productspecifications.Singlemodemechanicalfibresplice
【原文标准名称】:用于光纤传递系统的纤维形成体和闭路.产品规范.单模光纤机械接头
【标准号】:BSEN50411-3-2-2011
【标准状态】:现行
【国别】:英国
【发布日期】:2011-04-30
【实施或试行日期】:2011-04-30
【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】:
【英文主题词】:Cables;Components;Connectiontechnology;Electricplugs;Electronicequipmentandcomponents;Environment;Environmentalcondition;Fasteners;Fibreoptics;Glassfibrecables;Glassfibres;Measurement;Measuringtechniques;Monomodefibres;Opticalwaveguides;Performanceinservice;Specification(approval);Splices;Testreports;Testing
【摘要】:1.1ProductdefinitionThisEuropeanStandardcontainstheinitial,startoflifedimensional,optical,mechanicalandenvironmentalperformancerequirements,whichasinglemodemechanicalspliceshallmeetinorderforittobecategorisedasanENstandardproduct.Sincedifferentvariantsandgradesofperformancearepermitted,productmarkingandidentificationdetailsaregivenin3.5.AlthoughinthisdocumenttheproductisqualifiedforEN60793-2-50typesB1.1andB1.3singlemodefibres,itmayalsobesuitableforotherfibretypes.1.2InteroperabilityTheinstalledmechanicalsplicefitsintoafibremanagementsystemwithopticalfibresplicecassettesorsplicetrays.ThisEuropeanStandardspecifiesthefollowingtwophysicalinterfacedimensions:a)crosssectionalprofilewithwidth,heightordiameter(inmillimetres);b)length(inmillimetres).1.3ExpectedperformanceInthisdocument,theperformanceofamechanicalspliceisgivenwithidenticalfibresonly.Lossesassociatedwithfibrecladdingdiameterandmodefieldmismatcharenottakenintoaccount.Themeasuredattenuationisafunctionofthecoreconcentricity,claddingnon-circularityandalignmentcapability.Theopticalreturnlossperformanceisafunctionoftheindexmatchinggelandthefibreendfacepreparation.1.4OperatingenvironmentThetestsselectedcombinedwiththeseveritiesanddurationsarerepresentativeofanoutdoorenclosedenvironmentdefinedascategoryUinEN61753-1.Toensurethattheproductcanbeusedinclosures,boxesorstreetcabinetforcategoriesA,GandS(asdefinedEN61753-1)thespecifiedlowertemperatureisextendedto-40°Candrequirementsfortemporaryfloodinghavebeenadded.1.5ReliabilityWhilsttheanticipatedservicelifeexpectancyoftheproductinthisenvironmentis20years,compliancewiththisspecificationdoesnotguaranteethereliabilityoftheproduct.Thisshouldbepredictedusingarecognisedreliabilityassessmentprogramme.1.6QualityassuranceCompliancewiththisspecificationdoesnotguaranteethemanufacturingconsistencyoftheproduct.Thisstandarddoesnotcoverqualityinsurance.
【中国标准分类号】:M33
【国际标准分类号】:33_180_20
【页数】:24P.;A4
【正文语种】:英语

标准名称：	建设工程劳动定额 市政工程-道路工程
替代情况：	替代LD/T 99.5-1997
发布部门：	人力资源和社会保障部
发布日期：	2009-01-08
实施日期：	2009-03-01
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