【英文标准名称】:Acoustics.Referencezeroforthecalibrationofaudiometricequipment.Referenceequivalentthresholdsoundpressurelevelsforpuretonesinthefrequencyrange8kHzto16kHz
【原文标准名称】:声学.听力测定设备校正基准点.频率范围8kHz-16kHz的纯音参考等效域声压级
【标准号】:BSISOTR389-5-1998
【标准状态】:作废
【国别】:英国
【发布日期】:1998-09-15
【实施或试行日期】:1998-09-15
【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】:耳机;声学;听觉阈;听觉;听力测定;声学设备;频率;校正;听力计;声强
【英文主题词】:audiometry;calibration;audiometers;frequencies;acousticequipment;soundintensity;acoustics;earphones;hearing(auditoryperception);auditorythreshold
【摘要】:
【中国标准分类号】:N65
【国际标准分类号】:13_140
【页数】:12P;A4
【正文语种】:英语


【英文标准名称】:Safetyofsmallpowertransformers,powersupplyunitsandsimilar-Part2-8:Particularrequirementsforbellandchimetransformers
【原文标准名称】:电力变压器、电源装置及类似设备的安全第2-8部分:电铃和电闹钟变压器的特殊要求
【标准号】:IEC61558-2-8-1998
【标准状态】:作废
【国别】:国际
【发布日期】:1998-08
【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/TC96
【标准类型】:()
【标准水平】:()
【中文主题词】:电气工程;安全隔离变压器;试验;规范(验收);变压器;供电系统;电力变压器;电铃变压器
【英文主题词】:Belltransformers;Bodies;Classificationsystems;Definitions;Dimensioning;Electricalengineering;Electricalsafety;Firesafety;Mainsunits;Marking;Monophase;Powersupplysystem;Powertransformers;Protectionagainstelectricshocks;Safety;Safetyisolatingtransformers;Short-circuitprotection;Small-powertransformers;Specification(approval);Testing;Transformers
【摘要】:Replacement:Thisinternationalstandarddealswithallaspectsofsafetysuchaselectrical,thermalandmechanical.Thispart2-8ofIEC61558appliestofixed,single-phase,air-cooled(naturalorforced),independantorassociatedsafetyisolatingtransformersforbellandchimes,havingaratedsupplyvoltagenotexceeding250Va.c,aratedfrequencynotexceeding500Hz,aratedoutputnotexceeding100VA.Theno-loadoutputvoltageshallnotexceed33Va.c.or46Vripplefreed.c.andtheratedoutputvoltageshallnotexceed24Va.c.or33Vripplefreed.c.Bellandchimetransformersaregenerallyintendedtosupplydomesticsoundsignallingequipmentandothersimilardeviceswheretheloadisappliedforshortperiodsoftime.NOTE1-Apartialloadmaybeappliedforilluminationpurposes.Thisstandardappliestospecialsafetyisolatingtransformers(transformerforbellandchime)whichareusedwheredoubleorreinforcedinsulationbetweencircuitsisrequiredbytheinstallationrulesorbytheappliancespecification.Thisstandardisapplicabletodry-typetransformers.Thewindingsmaybeencapsulatedornon-encapsulated.NOTE2-Attentionisdrawntothefactthatfortransformersintendedtobeusedintropicalcountriesspecialrequirementsmaybenecessary.Thisstandardalsoappliestotransformersincorporatingelectroniccircuits.Thisstandarddoesnotapplytoexternalcircuitsandtheircomponentsintendedtobeconnectedtotheinputandoutputterminalsorsocket-outletsofthetransformer.
【中国标准分类号】:K41
【国际标准分类号】:29_180
【页数】:27P;A4
【正文语种】:英语