【英文标准名称】:StandardSpecificationforConcreteMadeByVolumetricBatchingandContinuousMixing
【原文标准名称】:容积式分批制和连续混合制混凝土标准规范
【标准号】:ASTMC685/C685M-2000
【标准状态】:作废
【国别】:美国
【发布日期】:2000
【实施或试行日期】:
【发布单位】:美国材料与试验协会(ASTM)
【起草单位】:ASTM
【标准类型】:()
【标准水平】:()
【中文主题词】:施工材料;混凝土;发电
【英文主题词】:generation;constructionmaterials;concretes
【摘要】:
【中国标准分类号】:Q13
【国际标准分类号】:91_100_30
【页数】:
【正文语种】:英语


【英文标准名称】:Digitalradiomondiale(DRM)-Part2:Digitalradiointhebandsbelow30MHz-MethodsofmeasurementforDRMtransmitters(IEC62272-2:2007);GermanversionEN62272-2:2007,textinEnglish
【原文标准名称】:全球数字无线广播(DRM).第2部分:波段小于30MHz的数字无线广播.DRM发射机的测量方法
【标准号】:DINEN62272-2-2007
【标准状态】:现行
【国别】:德国
【发布日期】:2007-11
【实施或试行日期】:2007-11-01
【发布单位】:德国标准化学会(DIN)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:频带;广播工程学;广播;特性;传播学;传播技术;定义;数字的;数字广播;数字连接;数字数据;数字工程;数字无线电链接;电气工程;英语;频率;频率范围;测量;测量技术;功率输出;无线电工程;无线电装置;无线电发射机;无线电通信;额定输出电压;声音广播发射;规范;规范(验收);通信;电信传输法;电信;传输性能
【英文主题词】:Bandoffrequencies;Broadcastengineering;Broadcasting;Characteristics;Communication;Communicationtechnology;Definition;Definitions;Digital;Digitalbroadcasting;Digitalconnections;Digitaldata;Digitalengineering;Digitalradiolinks;Electricalengineering;Englishlanguage;Frequencies;Frequencyranges;Measurement;Measuringtechniques;Poweroutput;Radioengineering;Radiosystems;Radiotransmitters;Radiocommunication;Ratedoutputpower;Sound-broadcastingemissions;Specification;Specification(approval);Telecommunication;Telecommunicationtransmissionmethods;Telecommunications;Transmissionperformance;Transmissionperformances
【摘要】:ThispartofIEC62272describesthemethodsofmeasurementtoassesstheperformancecharacteristicsofdigitalmodulatedradiotransmittersinthebandsbelow30MHzforsoundand/ordatabroadcastingintheLF,MFandHFbands,andtofacilitatethecomparisonofmeasurementswhicharecarriedoutbydifferentpersonnel.Itcontainsdetailsofspeciallyselectedmethodsfordeterminingthemostimportantperformanceparametersofdigitalradiotransmitters.Themeasurementmethodsdescribedapplytoalimitednumberofperformanceparameters,i.e.thosewhichcangiverisetoambiguousinterpretationduetotheuseofdifferentmethodsandconditions.Theyareneitherrestrictivenormandatory:measurementscanbechosenforeachparticularcase.Themeasurementmethodsdescribedinthisstandardareintendedtobeusedfortypeapprovaltests,qualitycontroltestsoracceptancetestmeasurementsinfactoriesandonsite.Feweroradditionalmeasurementsmaybecarriedoutbyagreementbetweencustomerandsupplier.Anyadditionaltestshouldcomplywithstandardswhichhavebeenestablishedbyotherstudygroups,subcommitteesoftheIECorotherinternationalorsuitablyaccreditedorganizations.Thisstandarddoesnotspecifylimitingvaluesforacceptableperformanceastheseareusuallygivenintheequipmentspecificationorinrequirementslaiddownbytheresponsibleregulationbodies.However,somevaluesarequoted,whereappropriateforguidanceinthepresentationoftheresults.
【中国标准分类号】:M74
【国际标准分类号】:33_170
【页数】:22P.;A4
【正文语种】:英语