BS 5550-5.4.3-1987 电影技术.第5部分:多种胶片宽度的通用部分.第4节:伴音.第3小节:无图象的35mm和单轨17.5mm胶片上三,四或六磁道磁性声频记录用录音和放音头间隙的位置与宽度尺寸规格

上一篇: BS 5551-4.2.3-1987 肥料.第4部分:化学分析.第2节:磷的测定.第3小节:磷含量测定方法(喹啉二磷化钼重量分析法)
下一篇: DIN 23004-1-1987 硬煤精选.概括说明

【英文标准名称】:StandardPracticeforConstructionandUseofaProbeforMeasuringElectricalContactResistance
【原文标准名称】:电接触阻力测量用探头的制造和使用的标准实施规程
【标准号】:ASTMB667-1997(2009)
【标准状态】:现行
【国别】:美国
【发布日期】:1997
【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】:B02.11
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:接触电阻
【英文主题词】:contactresistance;electricalcontact;goldprobe;reliability;resistanceprobe;wireprobe;Electricalresistance/resistivity--electricalcontactmaterials;Electricalcontactmaterials;Probemethods
【摘要】:Electricalcontactresistanceisanimportantcharacteristicofthecontactincertaincomponents,suchasconnectors,switches,sliprings,andrelays.Ordinarily,contactresistanceisrequiredtobelowandstableforproperfunctioningofmanydevicesorapparatusinwhichthecomponentisused.Itismoreconvenienttodeterminecontactresistancewithaprobethantoincorporatethecontactmaterialintoanactualcomponentforthepurposeofmeasurement.However,iftheprobecontactmaterialisdifferentfromthatemployedinthecomponent,theresultsobtainedmaynotbeapplicabletothedevice.Informationoncontactresistanceisusefulinmaterialsdevelopment,infailureanalysisstudies,inthemanufacturingandqualitycontrolofcontactdevices,andinresearch.Contactresistanceisnotauniquesingle-valuedpropertyofamaterial.Itisaffectedbythemechanicalconditionsofthecontact,thegeometryandroughnessofcontactingsurfaces,surfacecleanliness,andcontacthistory,aswellasbythematerialpropertiesofhardnessandconductivityofbothcontactingmembers.Anobjectiveofthispracticeistodefineandcontrolmanyoftheknownvariablesinsuchawaythatvalidcomparisonsofthecontactpropertiesofmaterialscanbemade.Insometechniquesformeasuringcontactresistanceitisnotpossibletoeliminatebulkresistance,thatis,theresistanceofthemetalpiecescomprisingthecontactandtheresistanceofthewiresandconnectionsusedtointroducethetestcurrentintothesamples.Inthesecases,themeasurementisactuallyofanoverallresistance,whichisoftenconfusedwithcontactresistance.1.1Thispracticedescribesequipmentandtechniquesformeasuringelectricalcontactresistancewithaprobeandthepresentationofresults.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.ItistheresponsibilityoftheuserofthisstandardtobecomefamiliarwithallhazardsincludingthoseidentifiedintheappropriateMaterialSafetyDataSheet(MSDS)forthisproduct/materialasprovidedbythemanufacturer,toestablishappropriatesafetyandhealthpractices,anddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:N25
【国际标准分类号】:17_220_20
【页数】:5P.;A4
【正文语种】:英语


【英文标准名称】:Mineralandsapphirewatch-glasses-Part1:Dimensionsandtolerances
【原文标准名称】:无机和蓝宝石表玻璃第1部分:尺寸和公差
【标准号】:ISO14368-1-2000
【标准状态】:现行
【国别】:国际
【发布日期】:2000-06
【实施或试行日期】:
【发布单位】:国际标准化组织(ISO)
【起草单位】:ISO/TC114
【标准类型】:()
【标准水平】:()
【中文主题词】:直径;无机玻璃;表;厚度;;符号;时间测量装置;尺寸;尺寸公差;表面玻璃;时计学
【英文主题词】:Diameter;Dimensionaltolerances;Dimensions;Horology;Mineralglasses;Sapphires;Symbols;Thickness;Timemeasuringdevice;Watches;Watch-glasses
【摘要】:ThispartofISO14368specifiesthedimensionsandtolerancesofmineralandsapphirewatch-glasses.Itisapplicabletoround,flatwatch-glasses,typicallyofdiameter8mmto35mm.
【中国标准分类号】:Q34
【国际标准分类号】:39_040_10
【页数】:2P;A4
【正文语种】:英语