【英文标准名称】:Hearingaids-Part6:characteristicsofelectricalinputcircuitsforhearingaids.
【原文标准名称】:助听器.第6部分:助听器输入电路特性
【标准号】:NFC97-626-1999
【标准状态】:现行
【国别】:法国
【发布日期】:1999-12-01
【实施或试行日期】:1999-12-05
【发布单位】:法国标准化协会(AFNOR)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:声学;安全;电缆接头;规范(验收);助听器;作标记;入口;电性质和电现象;安全要求;电的;电插头;输入阻抗;特性;电声学;电气工程;电声器件;安全工程;插接件连接;电气安全
【英文主题词】:
【摘要】:
【中国标准分类号】:L31
【国际标准分类号】:17_140_50
【页数】:8P;A4
【正文语种】:其他


【英文标准名称】:StandardTestMethodforCrimpFrequencyofmanufacturedStapleFibers
【原文标准名称】:纺纱用人造短纤维卷曲率的标准试验方法
【标准号】:ASTMD3937-2007
【标准状态】:现行
【国别】:
【发布日期】:2007
【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】:D13.58
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:化学纤维;试验;纺织纤维;纺织材料
【英文主题词】:crimp;textilefibers
【摘要】:Thistestmethodforthedeterminationofcrimpfrequencyofmanufacturedstaplefibersmaybeusedfortheacceptancetestingofcommercialshipmentsbutcautionisadvisedsincebetween-laboratoryprecisionisknowntobepoor.Comparativetestsconductedasdirectedin5.1.1maybeadvisable.5.1.1Iftherearedifferencesorpracticalsignificancebetweenreportedtestresultsfortwolaboratories(ormore),comparativetestsshouldbeperformedtodetermineifthereisastatisticalbiasbetweenthem,usingcompetentstatisticalassistance.Asaminimum,testsamplesthatareashomogeneousaspossible,drawnfromthematerialfromwhichthedisparatetestresultswereobtained,andrandomlyassignedinequalnumberstoeachlaboratoryfortesting.Thetestresultsfromthetwolaboratoriesshouldbecomparedusingastatisticaltestforunpaireddata,ataprobabilitylevelchosenpriortotestingseries.Ifabiasisfound,eitheritscausemustbefoundandcorrected,orfuturetestresultsforthatmaterialmustbeadjustedinconsiderationoftheknownbias.Thistestmethodisusedforqualitycontrol.Itisanunsophisticatedprocedurewhichisparticularlyusefulindetectingmajordifferencesincrimpfrequency.Thistestmethodisnotconsideredtobeusefulinresearchanddevelopmentwhereminordifferencesormorecompletecrimpcharacterization,includingamplitudeandindex,maybenecessary.Crimpinfiberaffectsthecardingandsubsequentprocessingofthefiberintoeitherayarnoranonwovenfabric.Staplecrimpinfiberwillalsoaffectthebulkoropennessofayarnandthereforethehandandvisualappearanceofthefinishedtextileproduct.1.1Thistestmethodcoversthedeterminationofthecrimpfrequencyofmanufacturedstaplefibers.Thistestmethodisapplicabletoallcrimpedprovidedthecrimpcanbeviewedtwo-dimensionallyasasine-waveconfiguration.1.1.1Itshouldberecognizedthatyarnmanufacturingprocessesortreatmentstomanufacturedyarnscaninfluenceormodifycrimpinfiber.Hence,thevalueforcrimpoffiberstakenfromspunyarnsmaybedifferentthanthatofthesamefiberpriortothemanufacturingortreatmentprocesses.1.2Threeoptionsareprovidedforpreparationofthespecimens.OptionOne(preferred)usessinglefibersforthespecimenswithalowmagnificationavailable,OptionTwo(optionalforstapleortowsamples)usesfiberchipsasthespecimens,andOptionThreeusesprojectedimagesofsinglefibers.1.3ThevaluesstatedinSIunitsaretoberegardedasthestandard.Theinch-poundunitsinparenthesesareforinformationonly.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:W50
【国际标准分类号】:59_060_20
【页数】:4P.;A4
【正文语种】: