xp574088
II LIGA
Dołączył: 03 Sie 2010
Posty: 230
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Skąd: lxdwcg
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 Wysłany: Pią 12:22, 03 Gru 2010 |
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10 A～2 kA智能化浪涌电流测试仪
agnitudeofthesurgecurrent．Meanwhile，aftertherectifierdiodehaeentestedthroughsurgecurrent，thetechnicalparameterssuchastheactualcurrentwaveformanditsmagnitudehavebeendesigned，examinedanddataprocessed．Thentheactualsurgecurrentvaluewillbeexpressedbynumberontheinstrumentboard．Finally，thetestingmethodanderroranalysishavebeenprovided．Inprac-tice，itisprovedthatthistesterisaneconomical,[link widoczny dla zalogowanych]，appliednewgenerationtestingdeviceusedtotestrelevanttechnicalparameters，andhaeenachievedpracticalapplication．Keywords：storageenergy；surgecurrenttester；peak--to--peakforwardvohagedrop鐾蒜式‘芸：美：耋：(上接第13页)ACompatibleReceiverDesignforRadioSondeLIJun，WANGLuyu(SchoolofMicroandSolidElectronics，UniversityofElectronicScienceandTechnologyofChina，Chengdu610054,[link widoczny dla zalogowanych]，China)Abstract：ThispaperpresentsanewtypecompatibleFMreceiverfor1680MHzbandradiosondeswhichareusedinmeteorologymonitoring．Thestructureofthesondeandthesignalcharacteristicsareanalyzed，in-cludingthedatapacketformat,[link widoczny dla zalogowanych]，theRFoscillationcircuit,[link widoczny dla zalogowanych]，themodulationtypeandSOon．Accordingtothecomparisonofseveralfrequentlyuseddemodulationmethods，thePhase-shiftandMuhiplyingmethodisadopt_ed．BasedontheFrac-NPLLSabilityoffastfrequencyscanningandflexiblecontrolling，thispaperintro-ducesanewalgorithmforsignalscanningandtracking．ThesuperheterodynearchitecturewithfixedfirstLOandtunablesecondLOisimplemented．AprototypereceivercompatibleofGTS1typeandRS-8Otypeisreal。izedandthemeasurementisuptotheexpectation．Keywords：modulationanddemodulation；weathersonde,[link widoczny dla zalogowanych]；signaltracking；MSP430·l6·
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