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1、APIntroduction&THD+NAnalyzerinputandXLRconnectorAPPanelAudiospecificationsTHD+NAPintroductionAnalyzerinputcableconnection-Singleendedoutput(MP3headphone)2–Signal,3–Ground.e.g.,ChannelA:2–Leftoutput,3–GroundChannelB:2–Rightoutput,3–Ground-Differentialoutput(loudspeake
2、r)2–Non-invertingsignal,3–InvertingsignalAPintroductionXLRConnectorAPintroductionXLRConnector-Inreferencetoitsoriginalmanufacturer,JamesH.Cannon,founderofCannonElectricinLosAngeles,California(nowpartofITTCorporation),theconnectoriscolloquiallyknownasacannonplugorcann
3、onconnector.-Themostcommonisthe3-pinXLR3,usedalmostuniversallyasabalancedaudioconnectorforhighqualitymicrophonesandconnectionsbetweenequipment.-XLRplugsandsocketsareusedmostlyinprofessionalaudioandvideoelectronicscablingapplications.Homeaudioandvideoelectronicsnormal
4、lyuseRCAconnectors.APintroductionAP1PanelAPintroductionTHD+NvsLevelCurveAPintroductionAnalyzerPanelAPintroductionSweepDefinitionsPanelAPintroductionFrequencyResponse-FrequencyResponsemeasurementsaremadebysteppingorsweepingasinewaveoscillator,atafixedamplitude,acrosst
5、hespectrumofinterest.-UsuallystatedintermsofdBvariationfromsomereferencemidbandfrequency(e.g.,1KHz).-Thetestmaybeeasilymodified.Thefrequencyrangeanddirectionofsweepcanbechangedfromthe20KHz~20HzstoredbyenteringnewvaluesforSTARTandSTOPunderSWEEP(F9)DEFINITIONSpanel.APi
6、ntroductionSignaltoNoiseRatio-Signaltonoiseratio,asarelativemeasurement,mustbemadewithreferencetoaspecificoutputamplitudefromthedeviceundertest.-Theratedoutputamplitudemustbecalibratedasthe0dBrreferenceoftheanalyzer.Thentheresidualoutputamplitude(noise)ismeasuredande
7、xpressedindBrelativetothereference.APintroductionCrosstalk-Signalsfromonechannelleakingintoanotherchannel.Normally,thishappensbetweenleftandrightstereochannels.-Ageneratordrivesonechannelandthischannel'soutputvalueisnoted;meanwhiletheotherchannelissetforzerovolts.The
8、measuredchannelleftopen.-Whateversignalisinducedintothetestedchannelismeasuredatitsoutputwithanrmsvoltmeterandnoted.Aratioisformedb
