3 Audio Measurements for Production Test_Chinese

AudioMeasurementsforProductionTest生产线上的音频测量Agenda日程表Overviewofproductiontest生产线测量概述Designingasuiteofsuitabletests设计一套合适的测试Improvingtestspeed改善测试速度Automationfeatures自动测量的特点Questions&answers问题与解答Whytestontheproductionline?为什么要进行生产线测量Quality品质Ensureproductsshippedtomarketmeetdesignrequirements确保流入到市场的产品符合设计要求Maintainimageofbrandqualitytoensurecustomerloyalty维护品牌的形象来确保客户的忠信Avoiddefectnightmaresthat“goviral”Contractmanufacturingrequirement制定生产制造的要求ProductionTestEngineeringIssues生产线测试技术问题Testdesign–makingtherightmeasurements测试设计—进行正确的测量Speed–testcannotbeabottleneck速度—测试不应成为瓶颈Integrity–ensuringtestsarecompletedandnotcompromised完整性–确保测试是完整的Reporting测试报告SpecialChallenges特别的挑战ACMainsPower交流供电电源Quality品质Reliability可靠性Noise(propergroundingmaybedifficult)噪声(合适的接地可能是个难题)Environmental环境Heat热度Humidity湿度Dust灰尘Washwater!洗涤水Operators操作人员Maytryto“cheat”andpassfailedunits有可能”欺骗”而让不良产品通过测试Skilllevel–graphicsinprompts技术水平—图形化提示2productionlinecategories:2生产线类别1.Small-volumeoperation小批量操作afewteststationsequippedwithanalyzers少量测试站配备分析仪paperorspreadsheet-filereportsareused使用纸质或电子文档报告littletonoprogrammingrequired.几乎不需要编程实现2.Large-volumeoperation大批量操作manyteststationsintegratedintoafactory-widesystem许多测试站整合到整个工厂的系统multipleanalyzer,meterandsensortypes,reportingpass/failandresultdatatoacentraldatabase.多功能分析仪,电表和传感器,报告通过/失败及测试数据到中央数据库SophisticatedAPIprogrammingisrequired需要精密的API编程Scope范围Thisseminarwillfocusonproductiontestforsmall-volumeoperations.这个研讨会将集中在小批量生产操作上面Methodsandconceptsareusefulforlarge-volumeoperationsalso方法和理念同样适用于大批量生产操作Modifyingmeasurementsforproductiontest为生产线测试修改测量内容GoldenUnit黄金单元Definecharacteristicsandspecificationstobeusedasastandard定义用来作标准的特性及规格Decidewhichcharacteristicsmustbeverifiedinproduction定义哪些特性必须在生产线上进行确认Modifyingmeasurementsforproductiontest为生产线测试修改测量内容Choosemeasurements选择测量项目BeginwithR&Dmeasurements以R&D的测量开始Chooseessentialmeasurementsandsimplify选择足够且简单的测量Optimizeforspeed最优化测试速度AssignPass/FailLimits指定PASS/FAIL限制Decidewhatwillhappenifameasurementfailslimits决定测量失败时会发生什么情况ProductionTestsforPowerAmps功放的生产线测试Foranaudioamplifier(ClassDorlinear)音频功放(D类或线性的)1.Gain增益2.THD+N总谐波失真加噪声3.FrequencyResponseDeviation频率响应偏移4.SignaltoNoiseRatio信噪比5.Crosstalk串音6.InterchannelPhase通道间相位7.DCOffset直流偏移DemonstrationDUT被测设备演示ClassDamplifier(ICdesign)D类功放(IC设计)15W/channel(4Ω,10%THD+N)15W/每通道(4Ω,10%THD+N)10W/channel(4Ω,0.1%THD+N)10W/每通道(4Ω,0.1%THD+N)Demohas8Ωloadresistors演示用8Ω负载阻抗ProductionTestDesign生产线测试设计TestsaredesignedinEngineeringorinacentralTestEngineeringDepartment测试由工程部或由工程测试中心部门来设计PictureofApx525DUTconfiguration被测设备配置Multitoneanalysis多音频分析Multiplediscretetonescombinedintoawaveform多个离散音频整合到测试波形里面FFTanalysisderivesaseriesoffrequencybins源于一系列频段的FFT分析Analysisofthebinscontainingtonesyields:频段内的分析Level电压Gain增益Phase相位Analysisofbinsbetweenthetonesyields:频段之间的分析Distortion失真Noise噪声Whymultitoneforproductiontest?为什么使用多音信号来做生产线测试?LevelRelativeLevelTotalRMSLevelRMSLevel(1frequency)MaximumLevel(1frequency)LevelDeviationGainPhase(spectrum)Phase(1frequency)Crosstalk(spectrum)Crosstalk(1frequency)SignaltoNoiseRatioTD+NLevelTD+NRatioTD+NSpectrumNoiseRMSLevelNoiseDensitySpectrumDCLevelFrequencyShiftFFTSpectrumAcquiredWaveform.ExtremelyFAST!21resultsin~1second特别快速!大约1秒的时间内获取21个测量结果Multitonesforproductiontest生产线测试的多音频信号Smallnumberoftonesissufficienttocatchmanufacturingdefects少量的音频音足以检测出制造上的缺陷Afewkeyresultswithlimitsareneededforafastandsimplesolution少量关键的包含限制条件的测量足以进行简单,快速的测量Example样例Multitonedemo多音频演示Let’screateaMultitonetest让我们创建一个多音频测试Asinglemeasurementprovidesalltheresultsspecifiedforourproductiontest单一的测量功能就可以获取生产线所需要的测试结果Gain增益TD+N总失真+噪声FrequencyResponseDeviation频率响应偏移SignaltoNoiseRatio信噪比Crosstalk串音InterchannelPhase通道相位DCOffset直流偏移Speedcheck?检查测试速度ToolsforAutomatedTest自动测试的工具GeneralPurposeI/O(GPIO)通用输入输出接口Outputs:switchrelays,indicatorsandotherexternaldevicesonoroff,basedontestoutcomes.输出:形状继电器,指示器及其他外部开/关设备,基于测试输出情况Inputs:Sensethestateofexternalswitchesorotherdevicestofortestcontrol.输入:外部切换开关或其他测试控制设备的状态感应Sequencing先后顺序ControlexternalPCapplications控制外部PC应用程序CustomReports自定义报告Operatordatainput操作员数据输入Usedeviceslikebarcodescannerstoensureaccuratedataentry使用类似扫描枪的设备来确保输入的精确度SerialNumber序列号PartNumber,etc.产品编号SimpleHIDinput简单的HID输入*IP.1234567890*Example–OpenLooptest样例—开环测试UserInputStep用户输入阶段Runexternalprogram运行外部程式ProductionTestImplementation生产线测试的执行实现APxprojectfilesareinter-changeableamongallaudioanalyzersintheAPxfamily.APx工程文件可以在所有APx系列音频分析仪之间更换.TestsdevelopedonanR&DanalyzerinEngineeringrunontheproductiontestanalyzer在工程开发用的音频分析仪设计的测试项目同样可以应用在生产线分析仪上.OperatorInstructions操作员说明Giveclearandfrequentinstructions给出明确的,常见的说明Self-documentingtestprocedures自己编写测试序列Improveclaritywith改进明确性可以用:Richtext文本Language语言Graphics图形Example样例OperatorPass/Failinput操作员Weoftenneedthetestoperatortojustindicateifsomethinghappened,e.g.有些情况下我们只需要操作人员确认某些情况是否发生,如:LEDlightcomesonLED出现发光DUTdisplaysthecorrectmessage被测设备显示正确的信息.