【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


【英文标准名称】:Alarmsystems-Alarmtransmissionsystemsandequipment-Annunciationequipmentusedinalarmreceivingcentres
【原文标准名称】:警报系统.警报传输系统和设备.警报接收中心用报警设备
【标准号】:BSDDCLC/TS50136-4-2004
【标准状态】:现行
【国别】:英国
【发布日期】:2004-02-27
【实施或试行日期】:2004-02-27
【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】:火灾探测器;规范(验收);试验;特性;电气工程;操纵装置;拨号设备(电话);传输系统;警报传输系统;运行监控系统;警报系统;信号传输;火灾警报;安全要求;电话网;防盗警报;保持报警系统;通信系统;信号器;电气安全;接触安全装置;远程通信;通信网;自动;指示装置;安全;警告装置;定义
【英文主题词】:Alarmsystems;Alarmtransmissionsystems;Annunciators;Automatic;Burglaralarms;Communicationnetworks;Contactsafetydevices;Definition;Definitions;Diallingequipment(telephones);Electricalengineering;Electricalsafety;Firealarms;Firedetectors;Hold-upalarmsystems;Indicatingdevices;Operatingdevices;Operationalmonitoringsystems;Properties;Safety;Safetyrequirements;Signaltransmission;Specification(approval);Telecommunication;Telecommunicationsystems;Telephonenetworks;Testing;Transmissionsystems;Warningdevices
【摘要】:ThisTechnicalSpecificationspecifiestherequirementsandtestproceduresforannunciationequipmentlocatedinanalarmreceivingcentre.Theannunciationequipmentmaybemadeupofoneormoreitemsofapparatusconnectedtogether(e.g.computers,electroniccardsinseparatehousings,displays,keypads,printers,etc).Thecombinationofthedifferentapparatusisconsideredasoneitemofannunciationequipmentwhichshallconformtotherequirementsofthisspecification.NOTETheserequirementsdonotapplytoannunciationequipment,madeupofmorethanonepieceofapparatus,whenoneormorepartsoftheannunciationequipmentareoutsidethealarmreceivingcentreatwhichmessageacceptancewillbeperformed.
【中国标准分类号】:A91
【国际标准分类号】:13_320
【页数】:28P.;A4
【正文语种】:英语