【英文标准名称】:Helical-scanvideotapecassettesystemusing12,65mm(0,5in)magnetictapeontypebetaformat;FMaudiorecording;part2:525line-60fieldsystems
【原文标准名称】:使用B型格式12.65mm(0.5in)磁带的螺旋扫描盒式磁带录像系统调频录音第2部分:525行-60场体系
【标准号】:IEC61053-2-1991
【标准状态】:现行
【国别】:国际
【发布日期】:1991-02
【实施或试行日期】:
【发布单位】:国际电工委员会(IEC)
【起草单位】:IEC/TC100
【标准类型】:()
【标准水平】:()
【中文主题词】:特性;磁带;电气工程;录像磁带;盒式磁带;β型;视频;螺旋扫描记录(法);视频记录;记录系统
【英文主题词】:videotaperecordings;recordingsystems;video;helicalscanrecording;electricalengineering;videorecording;magnetictapes;properties;beta-format;cassettes(magnetictapes)
【摘要】:DefinestheelectricalandmechanicalcharacteristicsofFMaudiorecordingwhichwillprovidefortheinterchangeabilityofrecordedcassettes.
【中国标准分类号】:M71
【国际标准分类号】:33_160_40
【页数】:10P;A4
【正文语种】:英语
【英文标准名称】:Fansforgeneralpurposes-Methodsofnoisetesting-Airbornenoiseemittedbysmallair-movingdevices-Section6:Airbornenoiseemittedbysmallair-movingdevices
【原文标准名称】:普通用途风扇.噪声试验方法.小型空气推动装置发出的空气噪声
【标准号】:BS848-2.6-2000
【标准状态】:作废
【国别】:英国
【发布日期】:2000-03-15
【实施或试行日期】:2000-03-15
【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】:噪声(环境的);空气噪声测量;通风机;声功率;声压;声学;声学测量;试验结果
【英文主题词】:Acousticmeasurement;Acoustics;Measurementofairbornenoise;Noise(environmental);Soundpower;Soundpressure;Testresults;Ventilators
【摘要】:1ThisInternationalStandardspecifiesamethodformeasuringtheairbornenoiseemittedbysmallair-movingdevicessuchasthoseusedforcoolingelectronic,electricalandmechanicalequipment.Theseair-movingdevicesincludesuchtypesaspropellerfans,tube-axialfans,vane-axialfans,centrifugalblowers,transverseblowers,cabinetblowersandvariationsofthesetypes.ThisInternationalStandarddescribesamethodandthetestapparatusfordeterminingandreportingtheairbornenoiseemittedbysmallair-movingdevicesasafunctionoftheairflowandthefanstaticpressuredevelopedbytheair-movingdeviceonthetestapparatus.Itisintendedforusebyair-movingdevicemanufacturers,bymanufacturerswhouseair-movingdevicesforcoolingelectronicequipmentandsimilarapplications,andbytestinglaboratoriesonbehalfofthesemanufacturers.ResultsofmeasurementsmadeinaccordancewiththisInternationalStandardareexpectedtobeusedforengineeringinformationandperformanceverification,andthemethodmaybecitedinpurchasespecificationsandcontractsbetweenbuyersandsellers.Theultimatepurposeofthenoiseemissionmeasurementsistoprovidedatatoassistthedesignersofelectronic,electricalormechanicalequipmentwhichcontainsoneormoreair-movingdevices.2ThisInternationalStandardisapplicabletosmallair-movingdevicesusedforcoolingelectronicequipmentandforsimilarapplicationswherethetotalsoundpowerleveloftheair-movingdeviceisofinterest.Experimentaldatashowthatthismethodisusefuluptoanairflowof1m/sanduptoafanstaticpressureof750Pa.ThisInternationalStandardissuitablefortypetestsandprovidesamethodforair-movingdevicemanufacturers,equipmentmanufacturersandtestinglaboratoriestoobtaincomparableresults.ThemethoddefinedinthisInternationalStandard,byreferencetoISO7779,providesfordeterminationofsoundpowerlevelsinaqualifiedenvironment,usingeitheracomparisonmethodinareverberationroombasedonISO3741orISO3742oradirectmethodinessentiallyfree-fieldconditionsoverareflectingplanebasedonISO3744orISO3745.ThemethodspecifiedinthisInternationalStandardmaybeappliedtoair-movingdeviceswhichradiatebroad-bandnoise,narrow-bandnoise,ornoisethatcontainsdiscretefrequencycomponents.ThemethodspecifiedinthisInternationalStandardpermitsthedeterminationofnoiseemissionlevelsforanindividualunitundertest.Iftheselevelsaredeterminedforseveralunitsofthesameproductionseries,theresultsmaybeusedtodetermineastatisticalvaluefortheproductionseriesusingmethodsdescribedinISO7574-4orinISO9296.CAUTION-Vibration,flowdisturbances,insertionlossandotherphenomenamayalterradiatedsoundpowerintheactualapplication;therefore,theresultsofmeasurementsmadeinaccordancewiththisInternationalStandardmaydifferfromtheresultsobtainedwhenair-movingdevicesareinstalledinequipment.NOTE1ThisInternationalStandarddoesnotdescribemeasurementofthestructure-bornenoisegeneratedbyair-movingdevices,anditdoesnotcovermeasurementoftheaerodynamicperformanceofsuchdevices.
【中国标准分类号】:J72
【国际标准分类号】:17_140_20;23_120
【页数】:30P.;A4
【正文语种】:英语
基本信息
| 标准名称： | 货车用闸瓦销环型式与尺寸 |
| 中标分类： |
铁路 >>
机车车辆通用标准 >>
通用零部件 |
| 替代情况： | 被TB/T 34-1999代替 |
| 发布日期： | |
| 实施日期： | 1991-12-01 |
| 首发日期： | |
| 作废日期： | |
| 出版日期： | |
| 页数： | 1页 |
适用范围
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前言
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目录
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引用标准
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所属分类： 铁路 机车车辆通用标准 通用零部件