Agilent精确的阻抗测量新技术.pdf

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1、AgilentPN4294ANewTechnologiesForAccurateImpedanceMeasurement(40Hzto11OMHz)ProductNotePageContents11.Introduction22.ComparisonofPreviousImpedanceMeasure-mentTechniques33.FeaturesoftheAuto-Balancing-BridgeTechnique44.ProblemswithPreviousAuto-Balancing-BridgeTechnique65.Agilent4294ASolutionNo.1:Frequen

2、cyExpansion86.Agilent4294ASolutionNo.2:Impedance/1.IntroductionPhaseAccuracyImprovementsAstheoperationalfrequencyandqualityofelectroniccomponentsandmaterialsincreases,animpedance107.OtherNewTechnology—1:NewImpedancemeasurementinstrumentwithawidefrequencyProberangeandanexceptionalaccuracyisrequiredfo

3、radequateelectricalevaluation.118.OtherNewTechnology—2:7-mmConnectorAdapterTheAuto-Balancing-Bridgemethod(ABB)iswidelyusedforLow-Frequency(LF)impedanceanalysis.119.OtherNewTechnology—3:CableExtensionThistechniquehasmanyadvantagessuchasexcep-tionalmeasurementaccuracyandawideimpedance1210.Comparisonof

4、theLatestImpedanceMeasure-measurementrange,butitislimitedinitsfrequencymentTechniquescoverage.1211.SummaryInthisproductnote,newtechnologiesusedintheAgilentTechnologies4294APrecisionImpedanceAnalyzerarediscussed.ThisimpedanceanalyzerhasextendedthefrequencyrangeoftheABBtech-nique,andprovidesnewpossibi

5、litiesforLFimped-ancemeasurement.ThenewAuto-Balancing-Bridgemethodisexplainedinthisproductnote.2.ComparisonofPreviousImpedanceItistheonlytechnologythatcanmeasureathighMeasurementTechniquesfrequencies(microwave),buttheaccurateimped-ancemeasurementrangeislimitedtothoseimped-Table1showsthemajorimpedanc

6、emeasurementancevaluesthatareclosetothecharacteristictechniquesaswellasthepreviousfrequencyimpedanceoftheanalyzer.rangescovered.TheAuto-Balancing-BridgemethodprovidesthebestmeasurementaccuracyandIngeneral,applicationsrequiringimpedancemeas-broadestimpedancecoverage,thuspermittingitsurement,suchascom

7、ponentandmaterialevalua-useinallimpedancemeasurementapplicationsintion,utilizetheABBtechniqueintheLFfrequencytheLFfrequencyrange.TheI-Vmethodprovidesrange,whiletheRFI-VtechniqueisusedintheRFuniquefeat