【英文标准名称】:Methodsofmeasuringandexpressingtheperformanceofradioreceiversforsoundbroadcasting-Generalconsiderationsandmethodsofmeasurement,includingaudio-frequencymeasurements
【原文标准名称】:无线电广播接收机性能测定及表示方法.第1部分:一般条件和测量方法(包括音频测量)
【标准号】:BS4054-1-1995
【标准状态】:现行
【国别】:英国
【发布日期】:1995-11-15
【实施或试行日期】:1995-11-15
【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】:音频设备;通信设备;射频;频率控制;声音广播;额定频率;信号失真;性能试验;接收机;无线电接收机;接收;无线电设备;电路;电压;作标记;灵敏度;工作环境;调制;反馈;调谐;辐射测量法;电学测量;频率响应;音频;试验条件
【英文主题词】:Antennae;Antennas;Audiosignals;Audiofrequencies;Circuitnetworks;Conditions;Electricpowersystems;Electricalengineering;Electricalpropertiesandphenomena;Electronicengineering;Frequencies;Frequencymeasurement;High-frequencyengineering;Inputsignals;Instruments;Lowfrequencies;Lowvoltage;Marking;Measurement;Measurementconditions;Measuringfrequencies;Measuringtechniques;Metrology;Noise(spurioussignals);Overvoltage;Performance;Primarybatteries;Pushbuttons;Radioreceivers;Radiofrequencies;Receivers;Recordings;Safety;Safetyengineering;Stability;Telecommunication;Testing
【摘要】:Thisstandardappliestoradioreceiversofanykind,excludingtelevisionreceivers,andtothepartsofwhichtheyarecomposedorwhichareusedasauxiliariestosuchreceivers,excludingthosedealtwithinIECPublications94,98and268.Thisstandarddealswiththedeterminationofperformance,thecomparisonofequipmentandthedeterminationofproperpracticalapplicationsbylistingthecharacteristicswhichareusefulforspecificationsandlayingdownuniformmethodsofmeasurementforthesecharacteristics.Thisstandardisconfinedtoadescriptionofthedifferentcharacteristicsandtherelevantmethodsofmeasurement;itdoesnotingeneralspecifyperformancerequirements.Thecompletestandardconsistsofthefollowingparts,inwhichthecharacteristicsofvarioustypesofreceiverandtheirmethodsofmeasurementarespecified;somepartsincludepreferredvalues:—Part1:Generalconsiderationsandmethodsofmeasurement,includingaudio-frequencymeasurements(IECPublication315-1(1988)).—Part3:Radio-frequencymeasurementsonreceiversforamplitude-modulatedemissions(Publication315-3(1973)).—Part4:Radio-frequencymeasurementsonreceiversforfrequencymodulatedsound-broad-castingemissions(Publication315-4(1982)).—Part5:Specializedradio-frequencymeasurements.Measurementsonfrequency-modulatedreceiversoftheresponsetoimpulsiveinterference(Publication315-5(1971)).—Part8:Radio-frequencymeasurementsonprofessionalreceiversforfrequency-modulatedtelegraphysystems(Publication315-8(1975)).Thestandarddoesnotdealwithsafety,forwhichreferenceisrequiredtoIECPublication65orotherappropriateIECsafetystandards,norwithradiationandimmunity,forwhichreferenceisrequiredtoC.I.S.P.R.Publication13.
【中国标准分类号】:M74
【国际标准分类号】:33_060_20
【页数】:52P.;A4
【正文语种】:英语
基本信息
| 标准名称： | 船舶通用术语 综合 |
| 英文名称： | General terminology for ships; Comprehension |
| 中标分类： |
船舶 >>
船舶综合 >>
基础标准与通用方法 |
| ICS分类： |
造船和海上建筑物 >>
船舶和海上建筑物综合
|
| 替代情况： | 被GB/T 7727.1-2008代替 |
| 发布部门： | 中国船舶工业集团公司 |
| 发布日期： | 1987-05-18 |
| 实施日期： | 1988-05-01 |
| 首发日期： | 1987-05-18 |
| 作废日期： | 2008-08-01 |
| 主管部门： | 中国船舶工业集团公司 |
| 归口单位： | 全国海洋船标准化技术委员会 |
| 起草单位： | 603所等 |
| 出版社： | 中国标准出版社 |
| 出版日期： | 1988-05-01 |
| 页数： | 9页 |
适用范围
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前言
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目录
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引用标准
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所属分类： 船舶 船舶综合 基础标准与通用方法 造船和海上建筑物 船舶和海上建筑物综合
【英文标准名称】:StandardPracticeforFieldLeakTestingofPolyethylene(PE)PressurePipingSystemsUsingGaseousMediaUnderPressure(PneumaticLeakTesting)
【原文标准名称】:使用压力气体介质对聚乙烯(PE)压力管道系统进行现场渗漏试验的标准实施规程(气体渗漏试验)
【标准号】:ASTMF2786-2010
【标准状态】:现行
【国别】:美国
【发布日期】:2010
【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】:F17.40
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:
【英文主题词】:airtest;compressedairtest,pressure;fieldleaktest,;leaktest;polyethylenepipe;pneumaticleaktest
【摘要】:Ifrequiredbytheauthorityhavingjurisdiction,pressurizedgaseousmedialeaktestingmaybeconductedafterinstallationtodiscoverandcorrectleaksorfaultsinanewlyconstructedormodifiedpolyethylenepressurepipingsystembeforeplacingthesysteminservice.Leakageorfaultsusuallyoccuratconnections,joints,andmechanicalsealswheresealingunderpressureisrequired.Safetyisofparamountimportancewhenconductingpressurizedgaseousmedialeaktestsbecausetestingresultsincludenoleaks,leaks,suddenviolentrupture,orcatastrophicfailure.Systemsthatcontainlowerpressureratedornon-pressureratedcomponentsthatcannotbeisolatedorremovedfromexposuretotestpressure,orwheretemporarycapsorclosuresarenotpractical,arenotsuitablefortestinginaccordancewiththispractice.LeakageAllowance8212;Leakageisnotallowedforjointsincludingbutt,socketandsaddlefusion,electrofusion,andrestrainedgas-tightmechanicaljoints.See7.6.Othertypesofjoints,connections,orcomponentshavingsealsinthesystemmayhavealeakageallowance.Contactthejoint,connectionorcomponentmanufacturerforinformation.Poisson-EffectExpansionandContraction8212;Whentestpressureisappliedtoplasticpipingsystemsthathavefullyrestrainedjointssuchasheatfusion,electrofusion,boltedflanges,etc.,reductionofoveralllengthoranincreaseinlongitudinalstressresultsfromdiametricalexpansionofthepipe.Disjoining(pull-out)ofpartiallyrestrainedornon-restrainedconnectionsorjointssuchasbell-and-spigotjointshavinginsufficientresistancetopull-outstressorlengthreductionispossiblewhensuchjointsarein-linewiththetestsection.TopreventPoisson-effectdisjoining,takemeasuressuchasinstallingexternaljointrestraints(diametricalclampsandtie-rods)acrossin-linepartiallyrestrainedornon-restrainedjoints,installingin-linethrustanchorsattheendsoffullyrestrainedpipingsections,orisolatingafullyrestrainedtestsectionfrompipingwithnonrestrainedorpartiallyrestrainedjoints.Note38212;Atensilestressisappliedtoamaterialwillcauseelongationinthedirectionoftheappliedstress,andwillcauseadecreaseindimensionatrightanglestothedirectionoftheappliedstress.TheratioofdecreasetoelongationisthePoissonratio.Undertestpressure,pipingmaterialswillexpandslightlyindiameterandcontractinlengthslightlyaccordingtothePoissonratioofthematerial.1.1Thispracticeprovidesinformationonapparatus,safety,pre-testpreparationandproceduresforconductingfieldtestsofpolyethylenepressurepipingsystemsafterinstallationusinggaseousmediasuchasunodorizedinertnon-toxicgasorair,andapplyingpressuretodetermineifleaksexistinthesystem(pneumaticleaktesting).Thispracticeappliesonlytotestingtodiscoverleakage.Testingforotherpurposessuchastestingtoestablishoperatingpressureisbeyondthescopeofthispractice.1.2Thispracticedoesnotaddressleaktestingusingpressurizedliquids(hydrostatictesting).Forfieldleaktestingusingpressurizedliquids,seePracticeF2164.1.3Leaktestingwithpressurizedgaseousmediashallbeusedonlyifoneofthefollowingconditionsexists:1.3.1Thepipingsystemissodesignedthatitcannotbefilledwithaliquid,or1.3.2Thepipingsystemservicecannottoleratetracesofliquidtestingmedia.1.4Wherehydrostatictestingisspecifiedincontractdocumentsorbyt......
【中国标准分类号】:P94
【国际标准分类号】:23_040_20
【页数】:8P.;A4
【正文语种】:英语