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【英文标准名称】:Fibreopticcommunicationsubsystemtestprocedures-Digitalsystems-Part2-8:DeterminationoflowBERusingQ-factormeasurements
【原文标准名称】:光纤通信子系统基本试验过程.数字系统.第2-8部分:用品质因数测量法测定低位错率
【标准号】:IEC61280-2-8-2003
【标准状态】:现行
【国别】:国际
【发布日期】:2003-02
【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/SC86C
【标准类型】:()
【标准水平】:()
【中文主题词】:多路传送;数字信号;接收机;接收机;误差;缺陷与故障;电气工程;定义;试验;输入功率;测量设备;光纤;测量;光波导;光学;电信
【英文主题词】:Bitrates;Communicationcables;Defects;Definitions;Digitalsignals;Electricalengineering;Errorlimits;Errors;Fibreoptics;Inputpower;Mathematicalcalculations;Measurement;Measuringequipment;Multiplex;Opticalwaveguides;Optics;Receivers;Telecommunications;Testing
【摘要】:ThispartofIEC61280specifiestwomainmethodsforthedeterminationoflowBERvaluesbymakingacceleratedmeasurements.Theseincludethevariabledecisionthresholdmethod(Clause4)andthevariableopticalthresholdmethod(Clause5).Inaddition,athirdmethod,thesinusoidalinterferencemethod,isdescribedinAnnexB.
【中国标准分类号】:M33
【国际标准分类号】:33_180_01
【页数】:36P.;A4
【正文语种】:英语


【英文标准名称】:StandardTestMethodforSurfaceWaterAbsorptionofTerryFabrics(WaterFlow)
【原文标准名称】:丝绒纺织品表面吸水性的标准试验方法(水流试验法)
【标准号】:ASTMD4772-2009
【标准状态】:现行
【国别】:美国
【发布日期】:2009
【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】:D13.59
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:吸收
【英文主题词】:absorption;surfacewaterabsorption;terryfabric;toweling;water;Absorption--textiles;Bathrooms;Beachtowels;Dishtowels;Facetowels;Handtowels;Kitchenmaterials/applications;Surfacewater;Textilefabrics(general);Towels;Waterabsor
【摘要】:Thistestmethodmaybeusedtotestthesurfacewaterabsorptionofterryfabricsforbathtowels,bathsheets,handtowels,kitchentowels,dishcloths,washcloths,beachwear,bathrobes,andthelike.Differentspecificationsmaybeneededforeachofthesefabricsbecauseofdifferentapplications.Itisrecognizedthatsurfacewaterabsorptionisonlyoneofthecharacteristicsthattheultimateconsumermayuseindeterminingwhichterryfabricisacceptable.ConsultSpecificationD5433forothercharacteristicsthatmaybeapplicabletoterryfabrics.Thistestmethodisrecommendedforqualitycontroltestingofterryfabricsduringmanufacturingandproductcomparisonsofdifferentterryfabricsbymanufacturers,retailers,andusers.Thistestmethodmaybeusedfortheacceptancetestingofcommercialshipmentsofterryfabrics,butcautionisadvisedsinceinterlaboratoryprecisionisknowntobepoor.Comparativetestsasdirectedin5.4.1maybeadvisable.Incaseofadisputearisingfromdifferencesinreportedtestresultswhenusingthistestmethodforacceptancetestingofcommercialshipments,thepurchaserandthesuppliershouldconductcomparativeteststodetermineifthereisastatisticalbiasbetweentheirlaboratories.Competentstatisticalassistanceisrecommendedfortheinvestigationofbias.Asaminimum,thetwopartiesshouldtakeagroupoflaboratorysamplingunits(suchastowels)thatareashomogeneousaspossibleandthatarefromalotofmaterialofthetypeinquestion.Thelaboratorysamplingunitsshouldthenberandomlyassignedinequalnumberstoeachlaboratoryfortesting.Theaverageresultsfromthetwolaboratoriesshouldbecomparedusingappropriatestatisticalanalysisforunpaireddataandanacceptableprobabilitylevelchosenbythetwopartiesbeforethetestingisbegun.Ifabiasisfound,eitheritscausemustbefoundandcorrectedorthepurchaserandsuppliermustagreetointerpretfuturetestresultswithconsiderationoftheknownbias.1.1Thistestmethoddeterminestheabilityofaterryfabrictorapidlyabsorbandretainliquidwaterfromsurfacessuchashumanskin,dishes,andfurniture.1.2Thistestmethodisnotapplicabletonon-terryfabricssuchashucktowels,waffle-weavetowels,crashtowels,flour-sacktowels,andnonwovenwipes.Thesteepangleofthespecimenontheapparatusmaycausealargeamountofwatertorunoffthesenon-pilefabrics,orthelightweight/openstructureofthesefabricsmayallowalargeamountofwatertocompletelypassthroughthespecimen;thusthetestresultmaynotbeavalidmeasureofanon-terryfabric''sabilitytoabsorbwater.1.3Thistestmethodisnotapplicabletodecorativeterryfabricsthatwillnotbeusedtoabsorbwaterfromsurfaces.1.4ThistestmethodiswritteninSIunits.Theinch-poundunitsthatareprovidedarenotnecessarilyexactequivalentsoftheSIunits.Eithersystemofunitsmaybeusedinthistestmethod.IncaseofrefereedecisionstheSIunitswillprevail.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:W55
【国际标准分类号】:59_080_99
【页数】:10P.;A4
【正文语种】:英语