【英文标准名称】:Methodsofanalysisoffatsandfattyoils.Othermethods.Determinationofbleachability
【原文标准名称】:脂肪和脂肪油的分析方法.第2部分:其他方法.第27节:漂白率的测定
【标准号】:BS684Sec.2.27-1987
【标准状态】:作废
【国别】:英国
【发布日期】:1987-07-31
【实施或试行日期】:
【发布单位】:英国标准学会(BSI)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:脂肪;试验条件;牛脂;棕榈籽油;动物油;油;润滑脂;植物脂肪;动物脂肪;植物油;漂白试验
【英文主题词】:vegetablefats;animalfats;testingconditions;grease;palmkerneloil;tallow;oils;bleachingtests;fats;animaloils;vegetableoils
【摘要】:
【中国标准分类号】:X14
【国际标准分类号】:
【页数】:4P;A4
【正文语种】:英语


【英文标准名称】:Methodsofmeasurementforradiotransmitters-Part1:Performancecharacteristicsofterrestrialdigitaltelevisiontransmitters
【原文标准名称】:无线电发射机测量方法.第1部分:地面数字电视发射机的工作特性
【标准号】:IEC62273-1-2007
【标准状态】:现行
【国别】:国际
【发布日期】:2007-02
【实施或试行日期】:
【发布单位】:国际电工委员会(IX-IEC)
【起草单位】:IEC/TC103
【标准类型】:()
【标准水平】:()
【中文主题词】:广播工程;广播;特性;通讯;通讯技术;条件;定义;数字的;数字广播;数字连接;数字数据;数字工程;数字无线电连接;数字电视;电气工程;电气测量;频率;频率范围;互相调制;测量;测量技术;测量方法;调制;性能;功率输出;无线电电路;无线电工程;无线电系统;无线电发射机;无线电通信;额定输出功率;声音广播发射;规范(验收);电讯;远程通信;通信;电信传输法;电信;电视发射机;陆地的;试验信号;试验;传输特性;传输性能;发射机;发射功率
【英文主题词】:Broadcastengineering;Broadcasting;Characteristics;Communication;Communicationtechnology;Conditions;Digital;Digitalbroadcasting;Digitalconnections;Digitaldata;Digitalengineering;Digitalradiolinks;Digitaltelevision;Electricalengineering;Electricalmeasurement;Englishlanguage;Frequencies;Frequencyranges;Intermodulation;Measurement;Measuringtechniques;Methodsformeasuring;Modulation;Performance;Poweroutput;Radiocircuits;Radioengineering;Radiosystems;Radiotransmitters;Radiocommunication;Ratedoutputpower;Sound-broadcastingemissions;Specification(approval);Telecommunication;Telecommunicationtransmissionmethods;Telecommunications;Televisiontransmitters;Terrestrial;Testsignals;Testing;Transmissioncharacteristics;Transmissionperformance;Transmitters;Transmittingpower
【摘要】:ThispartofIEC62273givestheconditionsformeasuringtheperformanceparametersofterrestrialdigitaltransmittersandforfacilitatingthecomparisonofmeasurementswhicharecarriedoutbydifferentpersonnel.Itcontainsdetailsofspeciallyselectedmethodsfordeterminingthemostimportantperformanceparametersofdigitaltransmitters.Themeasurementmethodsdescribedapplytoalimitednumberofperformanceparameters,i.e.thosewhichcangiverisetoambiguousinterpretationduetotheuseofdifferentmethodsandconditions.Theyareneitherrestrictivenormandatory:measurementscanbechosenforeachparticularcase.Ifnecessary,additionaltestscanbecarriedoutbuttheyshallcomplywiththosestandardswhichhavebeenestablishedbyotherstudygroups,subcommitteesoftheIECorotherinternationalorsuitablyaccreditedorganizations.Nolimitshavebeenassignedtoquantifyacceptablerangesofperformanceparameters.Thesearejudgedtobeproperlyincludedinthetechnicalspecificationsforindividualtransmitters;however,thetermsandthemannerusedtoquantifythemshouldideallybethosedescribedinafutureIECpublication.Themeasurementmethodsdescribedinthisstandardareintendedfortypeapprovaltests.Howevertheycanequallywellapplytoacceptancetestsmeasurementsandqualitycontroltestseitherinfactoriesoronsite.Testsignalsareusedtomeasureperformanceparametersforbothdigitalandanalogueterrestrialtransmitters.Theirelectroniccharacteristicsandtheirassociatedperformanceparametersarewidelyunderstood.Thetestsignalsaremeasuredaftertheyhavegonethroughthetransmitterequipmenttodetermineiftheirdegradationiswithintherequiredqualitycriteria.ThisstandarddoesnotgointoanydetailregardingMPEG2signalsorDVBprocessesnordoesitdealwithdigitalsignalprocessing.
【中国标准分类号】:M74
【国际标准分类号】:33_060_20;33_170
【页数】:39P.;A4
【正文语种】:英语