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【英文标准名称】:StandardTestMethodforTraceImpuritiesinMonocyclicAromaticHydrocarbonsbyGasChromatographyandExternalCalibration
【原文标准名称】:用气相色谱法和外部校准法对单环芳香烃中微量杂质的标准试验方法
【标准号】:ASTMD5917-2002
【标准状态】:现行
【国别】:
【发布日期】:2002
【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】:D16.04
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:化工技术;芳烃;杂质;气相色谱法;测试
【英文主题词】:aromatics;externalstandard;gaschromatography;impurities;purity;toluene;xylenes
【摘要】:Determiningthetypeandamountofhydrocarbonimpuritiesremainingfromthemanufactureoftoluene,mixedxylenes,andp-xylenesusedaschemicalintermediatesandsolventsisoftenrequired.Thistestmethodissuitableforsettingspecificationsandforuseasaninternalqualitycontroltoolwheretheseproductsareproducedorareused.Typicalimpuritiesare:alkanescontaining1to10carbonsatoms,benzene,toluene,ethylbenzene(EB),xylenes,andaromatichydrocarbonscontainingninecarbonatoms.5.1.1RefertoTestMethodD2306fordeterminingtheC8aromatichydrocarbondistributioninmixedxylenes.Purityiscommonlyreportedbysubtractingthedeterminedexpectedimpuritiesfrom100.00.However,agaschromatographicanalysiscannotdetermineabsolutepurityifunknownorundetectedcomponentsarecontainedwithinthematerialbeingexamined.ThistestmethodissimilartoTestMethodD2360,however,interlaboratorytestinghasindicatedabiasmayexistbetweenthetwomethods.Thereforetheuseriscautionedthatthetwomethodsmaynotgivecomparableresults.1.1Thistestmethodcoversthedeterminationofthetotalnonaromatichydrocarbonsandtracemonocyclicaromatichydrocarbonsintoluene,mixedxylenes,andp-xylenesbygaschromatography.Thepurityoftoluene,mixedxylenes,orp-xylenescanalsobecalculated.Calibrationofthegaschromatographicsystemisdonebytheexternalstandardcalibrationtechnique.Asimilartestmethod,usingtheinternalstandardcalibrationtechnique,isTestMethodD2360.1.2Totalaliphatichydrocarbonscontaining1through10carbonatoms(methanethroughdecanes)canbedetectedbythistestmethodatconcentrationsrangingfrom0.001to2.500weight%.1.2.1Asmallamountofbenzeneinmixedxylenesorp-xylenesmaynotbedistinguishedfromthenonaromaticsandtheconcentrationsaredeterminedasacomposite(see6.1).1.3Monocyclicaromatichydrocarbonimpuritiescontaining6through10carbonatoms(benzenethroughC10aromatics)canbedetectedbythistestmethodatindividualconcentrationsrangingfrom0.001to1.000weight%.1.4Thefollowingappliestoallspecifiedlimitsinthistestmethod:forpurposesofdeterminingconformancewiththistestmethod,anobservedvalueoracalculatedvalueshallberoundedoff"tothenearestunit"inthelastright-handdigitusedinexpressingthespecificationlimit,inaccordancewiththerounding-offmethodofPracticeE29.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.Forspecifichazardstatement,seeSection9.
【中国标准分类号】:G17
【国际标准分类号】:71_040_50;71_080_15
【页数】:8P.;A4
【正文语种】:


【英文标准名称】:Informationtechnology-FibreChannel-Part117:Methodologiesforjitterandsignalquality(MJSQ)
【原文标准名称】:信息技术.纤维通道.第117部分:跳动和信号质量(MJSQ)方法论
【标准号】:ISO/IECTR14165-117-2007
【标准状态】:现行
【国别】:国际
【发布日期】:2007-09
【实施或试行日期】:
【发布单位】:国际标准化组织(IX-ISO)
【起草单位】:ISO/IECJTC1/SC25
【标准类型】:()
【标准水平】:()
【中文主题词】:数据处理;定义;纤维光学;玻璃纤维电缆;信息技术;界面;跳动;测量;方法;性能;质量;信号级;信号传输;信号;规范(验收);开关点;测试;扩音值;传输协议;变化
【英文主题词】:Dataprocessing;Definition;Definitions;Fibreoptics;Glassfibrecables;Informationtechnology;Interfaces;Jitter;Measurement;Methods;Performance;Quality;Signallevel;Signaltransmission;Signals;Specification(approval);Switchingpoints;Testing;Thresholdvalue;Transmissionprotocol;Variations
【摘要】:Themeasurementmethodsandspecificationsareintendedaspartofatotalsignalperformancecompliancerequirementsetwherethephasecontentofthesignalisinvolved.Amoregeneralizedconceptforjittercompliancetestingisdevelopedwherethephasepropertiesofthesignalslevelsotherthanthenominalreceiverswitchingpointareconsideredaswellasthephasepropertiesatthenominalreceiverdetectionthreshold.ThepurposeofthisreportistoprovidebackgroundinformationforrevisingandexpandingthesignalspecificationspresentlycontainedwithintheFC-PH-n,FC-Pl-n,FC-100-DF-EL-Sand10GFCstandardsanddraftstandards.TheMJSQtechnicalreportisusedasabasisformanyofthesignalspecificationmethodologiesinthesedocuments.Afurtherpurposeistoincreasethegeneralunderstandingofjitterinmulti-gigabaudserialtransmissionsforapplicationtotransportsotherthanFibreChannel.Documentinghighspeedserialsignalmeasurementmethodsprovidesencouragementtoinstrumentcompaniestocreatecompatiblemeasurementsystemsandfixturingcapableofsupporting1GBdandhighertransmissionratesandmoregeneralizedjitterconcepts.AlthoughthisdocumentisoptimizedforusewithFibreChannel,themeasurementmethodologiesareapplicabletoabroadrangeofserialtransmissionschemes.ThisTechnicalReportappliestofullyfunctionalFibreChannelsubsystemandFCportimplementationsaswellastotheindividualcomponentsthatcomprisethelink.Thisallowsdeviceandenclosurelevelqualificationandtheinclusionofsystemjittercontributionssuchaspowersupplynoise,motornoise,crosstalkandsignalrejuvenaters.AmajorgoalofMJSQistoimprovetherelationshipbetweenmeasurementsonsignalsandreceiverperformanceintermsofbiterrors.Thereportaddstoorextendspreviousworkinthefollowingareas:a)ExposingseriousimplementationerrorscommonlyfoundfromimproperuseofBERT'sandsamplingoscilloscopes(improperuseoftimereferencesandimproperextractionoftotaljitterfromsamplingoscilloscopes)b)Algorithmsforseparatingjittercomponentsc)Completespecificationsforexecutingtestsincludingtestfixtures,instrumentationspecifications,calibrationschemes,measurementprocessesanddataoutputformats-examplesforseveralelectricalandopticalapplicationsd)Methodologyforspecifyinglaunchedandreceiversignalprocessingisusede)Inclusionofeventsoccurringatallsignallevelswithintheallowedeyeopeningatthespecifiedtotalpopulationprobability(e.g,.10)f)Extendingthereceivertolerancemethodologytoconsidereffectsofdifferentpopulationdistributions.TheMJSQTechnicalReportisinformativeandadvisoryonly.CertaincontentsofthisdocumentmaybeincorporatedintotheappropriateINCITSstandardinthefuture.
【中国标准分类号】:L70
【国际标准分类号】:35_200
【页数】:240P;A4
【正文语种】:英语