GB/T 4677.14-1988 印制板蒸汽-氧气加速老化试验方法

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基本信息
标准名称:印制板蒸汽-氧气加速老化试验方法
英文名称:Test method of steam/oxygen accelerated ageing of printed boards
中标分类: 电子元器件与信息技术 >> 电子元件 >> 印制电路
替代情况:被GB/T 4677-2002代替
发布日期:1988-06-01
实施日期:1988-10-01
首发日期:1900-01-01
作废日期:2003-04-01
出版日期:1900-01-01
页数:3页
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前言

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所属分类: 电子元器件与信息技术 电子元件 印制电路
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【英文标准名称】:SpecificationforThermoplasticElastomer-Ether-Ester(TEEE)(08.03)
【原文标准名称】:热塑醚.酯类弹性体规范
【标准号】:ANSI/ASTMD4550-1992
【标准状态】:作废
【国别】:美国
【发布日期】:1992
【实施或试行日期】:
【发布单位】:美国国家标准学会(ANSI)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:弹性体;塑料
【英文主题词】:plastics;elastomers
【摘要】:
【中国标准分类号】:G31
【国际标准分类号】:83_060
【页数】:
【正文语种】:英语


【英文标准名称】:StandardTestMethodforMeasuringRelativeComplexPermittivityandRelativeMagneticPermeabilityofSolidMaterialsatMicrowaveFrequenciesUsingCoaxialAirLine
【原文标准名称】:使用同轴空气电缆测量微波频率下固体材料相对复合电容率和相对磁导率的标准试验方法
【标准号】:ASTMD7449/D7449M-2008
【标准状态】:现行
【国别】:美国
【发布日期】:2008
【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】:D09.12
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:coaxialline;dielectricconstant;lossfactor;magneticpermeability;measurement;microwave;millimetrewave;permittivity;radiofrequency;scatteringparameter;transmission/reflection
【摘要】:Designcalculationsforradiofrequency(RF),microwaveandmillimetre-wavecomponentsrequiretheknowledgeofvaluesofcomplexpermittivityandpermeabilityatoperatingfrequencies.Thistestmethodisusefulforevaluatingsmallexperimentalbatchorcontinuousproductionmaterialsusedinelectromagneticapplications.Usethismethodtodeterminecomplexpermittivityonly(innon-magneticmaterials)orbothcomplexpermittivityandpermeabilitysimultaneously.1.1Thistestmethodcoversaprocedurefordeterminingrelativecomplexpermittivity(relativedielectricconstantandloss)andrelativemagneticpermeabilityofisotropic,reciprocal(non-gyromagnetic)solidmaterials.Ifthematerialisnonmagnetic,itisacceptabletousethisproceduretomeasurepermittivityonly.1.2Thismeasurementmethodisvalidoverafrequencyrangeofapproximately1MHztoover20GHz.Theselimitsarenotexactanddependonthesizeofthespecimen,thesizeofcoaxialairlineusedasaspecimenholder,andontheapplicablefrequencyrangeofthenetworkanalyzerusedtomakemeasurements.Thepracticallowerandupperfrequenciesarelimitedbyspecimendimensionrequirements(large,thickspecimensatlowfrequenciesandsmallspecimensathighfrequencies).Foragivenairlinesize,theupperfrequencyisalsolimitedbytheonsetofhigherordermodesthatinvalidatethedominant-modetransmissionlinemodelandthelowerfrequencyislimitedbythesmallestmeasurablephaseshiftthroughaspecimen.Beinganon-resonantmethod,theselectionofanynumberofdiscretemeasurementfrequenciesinameasurementbandwouldbesuitable.Thecoaxialfixtureispreferredoverrectangularwaveguidefixtureswhenbroadbanddataaredesiredwithasinglesampleorwhenonlysmallsamplevolumesareavailable,particularlyforlowerfrequencymeasurements1.3ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard.Theequationsshownhereassumeane+jx03C9;tharmonictimeconvention.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:A55
【国际标准分类号】:17_220_20
【页数】:8P.;A4
【正文语种】:英语