GT-8550A_OpManual 电路图.pdf
GigatronicsGT8550ASeriesUSBPowerSensors OperationManual,PartNumber34780,March04,2010 OperationManual GT8550ASeriesUSBPowerSensors RadioFans.CN 收音机爱 好者资料库 GigatronicsGT8550ASeriesUSBPowerSensors OperationManual,PartNumber34780,March4,2010 RadioFans.CN 收音机爱 好者资料库 GigatronicsGT8550ASeriesUSBPowerSensors OperationManual,PartNumber34780,March04,2010 Alltechnicaldataandspecificationsinthispublicationaresubjecttochangewithoutpriornoticeanddo notrepresentacommitmentonthepartofGigatronics,Incorporated. 2009GigatronicsIncorporated.Allrightsreserved.PrintedintheU.S.A. CONTACTINFORMATION Gigatronics,Incorporated 4650NorrisCanyonRoad SanRamon,California94583 Telephone:800.726.4442(onlywithintheUnitedStates) 925.328.4650 Fax:925.328.4700 OntheInternet: Warranty GigatronicsGT8550ASeriesUSBPowerSensorsarewarranted againstdefectivematerialsandworkmanshipforoneyearfrom dateofshipment.Gigatronicswillatitsoptionrepairorreplace productsthatareprovendefectiveduringthewarrantyperiod. ThiswarrantyDOESNOTcoverdamageresultingfromimproper use,norworkmanshipotherthanGigatronicsservice.Thereis noimpliedwarrantyoffitnessforaparticularpurpose,noris Gigatronicsliableforanyconsequentialdamages.Specification andpricechangeprivilegesarereservedbyGigatronics. RadioFans.CN 收音机爱 好者资料库 GigatronicsGT8550ASeriesUSBPowerSensors OperationManual,PartNumber34780,March4,2010 Regulatory compliance information This product complies with the essential requirements of the following applicable European Directives, and carries the CE mark accordingly. 89/336/EEC and 73/23/EEC EMC Directive and Low Voltage Directive EN61010-1 (1993) Electrical Safety EN61326-1 (1997) EMC Emissions and Immunity Manufacturers Name: Manufacturers Address Giga-tronics, Incorporated 4650 Norris Canyon Road San Ramon, California 94583 U.S.A. Type of Equipment: Model Series Number USB Power Sensor GT-8550A Model Numbers: GT-8551A, GT-8552A, GT-8553A, and GT-8888A DeclarationofConformityonfile.ContactGigatronicsatthefollowing; Gigatronics,Incorporated 4650NorrisCanyonRoad SanRamon,California94583 Telephone:800.726.4442(onlywithintheUnitedStates) 925.328.4650 Fax:925.328.4700 GigatronicsGT8550ASeriesUSBPowerSensors OperationManual,PartNumber34780,March04,2010 Record of Changes to This Manual Usethetablebelowtomaintainapermanentrecordofchangestothisdocument.Corrected replacementpagesareissuedasTechnicalPublicationChangeInstructions(TCPI).Whenyouareissued aTCPI,dothefollowing: 1. InserttheTCPIatthefrontofthemanualbinder. 2. RemovethepagesfromthemanualbinderthatarenotedintheTCPI. 3. Replacethepage(s)removedinthepreviousstepwiththecorrectedpage(s). 4. Recordthechangesinthetablebelow. TPCINumberTPCIIssueDateDateEnteredComments GigatronicsGT8550ASeriesUSBPowerSensors OperationManual,PartNumber34780,March4,2010 I TableofContents 1SafetyandManualConventions.1 1.1ProductReference.1 1.2PersonalSafetyAlert.1 1.3EquipmentSafetyAlert.1 1.4Notes.1 2Introduction.3 2.1Overview.3 2.2SensorsintheGT8550ASeries.4 2.3ReceivingandInspection.5 2.4ComputerRequirementsforMeasurementXpressSoftware.5 2.5MeasurementModes.6 2.6USBConsiderations.8 2.7InstallMeasurementXpress.9 2.8InstalltheGT8550AUSBSeriesPowerSensors.13 2.9StartMeasurementXpress.15 3UsingMeasurementXpress.17 3.1Overview.17 3.2MainAreasoftheMeasurementXpressGUI.17 3.3MenuBar .18 3.4ConfiguretheGT8550AUSBSeriesPowerSensors.29 3.5MeasureCWPower.32 3.6MeasurePulsePower.33 3.7UsetheMathFunctions.35 3.7UsetheMathFunctions.37 3.8UsetheStripChartFunction.38 3.9ThePulseProfilingWindow.41 3.10UsePulseProfiling.48 4Specifications.51 4.1GeneralSpecificationsforallSensors.51 4.2SensorMeasurementUncertaintyFactors.54 4.3AdditionalTechnicalSpecifications.58 GigatronicsGT8550ASeriesUSBPowerSensors IIOperationManual,PartNumber34780,March4,2010 ThispageintentionallyBlank GigatronicsGT8550ASeriesUSBPowerSensorsSafetyandManualConventions OperationManual,PartNumber34780,March4,2010 Page1 1 Safety and Manual Conventions Thismanualcontainsconventionsregardingsafetyandequipmentusageasdescribedbelow. 1.1 Product Reference Throughoutthismanual,theterm“GT8550A”referstoallmodelsofpowersensorswithinthe GT8550Aseries,unlessaspecificmodelpowersensorisreferenced. 1.2 Personal Safety Alert WARNING:Indicatesahazardoussituationwhich,ifnotavoided,couldresultin deathorseriousinjury. 1.3 Equipment Safety Alert CAUTION:IndicatesasituationwhichcandamageoradverselyaffecttheGT8550Aor associatedequipment. 1.4 Notes Notesaredenotedandusedasfollows: NOTE:Highlightsoramplifiesanessentialoperatingormaintenanceprocedure,practice, conditionorstatement. WARNING ! CAUTION SafetyandManualConventionsGigatronicsGT8550ASeriesUSBPowerSensors Page2OperationManual,PartNumber34780,March4,2010 Thispageisintentionallyblank. GigatronicsGT8550SeriesUSBPowerSensorsIntroduction OperationManual,PartNumber34780,March4,2010 Page3 2 Introduction 2.1 Overview NOTE:Inthismanual,theGT8550SeriesUSBPowerSensorisreferredtogenericallyasthe “GT8550A”forsimplicity.Thespecificmodelofpowersensorisusedwherenecessary. ThismanualprovidesinformationabouttheinstallationandoperationoftheGT8550ASeriesUSB PowerSensors.Productdescription,specifications,andsupportareincluded.Changestothismanual arerecordedinRecordofChangestoThisManualinthefrontsection. TheGT8550Afeaturesaruggedbodythatconnectsdirectlytoadesktoporlaptopcomputerusinga standardUSBportandUSBcable.Aseparatepowermeterisnotrequired.TheGT8550ASeriesUSB PowerSensorsallowforimmediateconversionofRFandmicrowavepowerintodigitaldatarightatthe pointofpowersensing.Thecompanionapplicationsoftware,MeasurementXpress,providesaGraphical UserInterface(GUI)tomakepowerandothermeasurements. ThebenefitsofusingMeasurementXpressare: FamiliarMicrosoftWindowsInterface Easytoreadnumbersandbargraphs Fastupdaterateallowsrealtimecircuittuning Internalzeroandcalthesensorpowersupreadytomakemeasurements IfyouwishtoprogramtheGT8550Aforautomatedtesting,aDynamicLinkLibrary(DLL)isincludedin theUSBflashdrivethatshipswiththeGT8550A.InformationforprogrammingtheGT8550Aisfoundin theGT8550ASeriesUSBPowerSensorsRemoteOperationandProgrammingManual. Sensorzeroingandmeterreferencecalibrationarenotrequired.Thisreducessetuptimeandsimplifies programming.TheGT8551AandGT8552Amodelsfeaturetriggeringcapabilities.(Refertothe Specificationschapteronpage51). Continuednextpage IntroductionGigatronicsGT8550ASeriesUSBPowerSensors Page4OperationManual,PartNumber34780,March4,2010 2.1 Overview, Continued AtypicalsetupformeasuringRFpowerusingtheGT8550AisshowninFigure1below. Figure1. GT8550AMeasurementSetup 2.2 Sensors in the GT-8550A Series Table1belowliststhebasicparametersofthefourmodelsofpowersensorintheGT8550ASeries. Table1 GT8550ASeriesSensors:BasicSpecificationsandApplications Parameter SensorModel GT8551AGT8552AGT8553AGT8888A Frequency Range 100MHzto8GHz1100MHzto8GHz110MHzto18GHz10MHzto8GHz1 MeasurementsCW,Modulation BAP2 MAP2 PAP2 Crestfactor CW,Pulse PulseProfiling Markers Gating CW CW Dynamicrange60to+20dBm60to+20dBm50to+20dBm60to+20dBm ApplicationsWireless communications andcomponent testingthatuse modulatedsignals. Aerospaceand defense:EW, ECM,ECCM,and radartesting FeaturesPulse Profiling Accuratepower measurementof continuouswave (CW)RFand microwavesignals Economicalpower measurementofCW signalsupto10GHz 1Operationalto10GHz 2Theseareexplainedinsection0onpage6. GT8550ASeriesUSBPowerSensor RFinput Computerwith MeasurementXpresssoftwareinstalled USBcable GigatronicsGT8550SeriesUSBPowerSensorsIntroduction OperationManual,PartNumber34780,March4,2010 Page5 2.3 Receiving and Inspection Uponarrival,inspectthecontentsoftheGT8550Ashippingcontainer.TheGT8550Aconsistsof: Sensor:therearefourmodelsofsensorstochoosefrom.ThesearedescribedinTable1onthe previouspage. USBcabletoconnectthesensortoacomputer(suppliedwithsensor) USBflashdrivecontaining: MeasurementXpresssoftware(thismayalsobedownloadedfromthewebsite ) FilestoenableprogrammingtheGT8550AUSBSeriesPowerSensor. 2.4 Computer Requirements for Measurement Xpress Software Table2belowshowstherequirementsofthecomputerusedwiththeGT8550ASeriesUSBPower Sensors. Table2 ComputerRequirementsforMeasurementXpressSoftware ParameterSpecification TypeofcomputerIBMcompatible OperatingsystemMicrosoftWindowsXPorWindowsVista Processorspeed500MHz RAM256MB Diskspace50MB USBinterfaceUSB2.0minimum IntroductionGigatronicsGT8550ASeriesUSBPowerSensors Page6OperationManual,PartNumber34780,March4,2010 Measurement Modes ThissectionexplainsthemeasurementmodeslistedinTable1onpage4. 2.4.2 ContinuousWave(CW) UseCWformeasuringunmodulatedCWRFsignals. 2.4.3 BurstAveragePower(BAP) TheBurstAveragePower(BAP)modemeasurestheaveragepowerduringanRFburst(SeeFigure2). Thismodeisveryusefulformeasurementofpulsemodulatedsignalswhicharenotflatorhave amplitudemodulationduringthepulseONperiod,asinthecaseofTDMA(TimeDivisionMultiple Access)communicationssignals.Inthismode,theGT8550Arecognizesthebeginningandendofaburst ofRFpowerandtakesanaverageofthepowerduringthatburst.TheRFlevelcanvaryoverawide rangeduringtheburstaslongasitremainsaboveanoisethreshold,whichisautomaticallycalculated byMeasurementXpress.AssoonastheRFpowerdropsbelowthenoisethreshold,theRFburstis completeandallfurtherreadingsarediscardeduntilthenextburststarts. Figure2. BurstMeasurement InBAPmode,theGT8550Aautomaticallydetermineswhichportionsofthesignalareinthepulseand whicharenot.Incomputingtheaveragepower,theGT8550Ausesonlythoseportionsthatarewithin thepulse.Theresultisthat,independentofthesignalspulsedutycycle,themeteralwaysreadsthe averagepowerinthepulseorburst.AswiththePAPmode,whenmeasuringapulsemodulatedsignal with50%dutycycle,thereadingintheBAPmodewouldbe3dBhigherthanintheMAPmode. However,intheBAPmode,thesignalsdutycyclecanchangedynamicallyintimewithoutaffectingthe meterreading.InthePAPmode,thedutycyclefactormustbeenteredtomatchthedutycycleofthe pulsedsignal. NOTE:BAPModerequiresaminimumpulseonorofftimeasdeterminedbythepowersensorpulse widthspecification. GigatronicsGT8550SeriesUSBPowerSensorsIntroduction OperationManual,PartNumber34780,March4,2010 Page7 2.4.4 ModulatedAveragePower(MAP) TheModulatedAveragePower(MAP)modemeasuresRFsignalswhichareamplitudemodulated,pulse modulated,orboth.IntheMAPmodetheGT8550AcalculatestheaverageRFpowerreceivedbythe sensoroveraperiodoftimecontrolledbythetimeconstantoftheinternaldigitalfilter.Theresultis comparabletomeasurementbyathermalpowersensor. Inthismode,the8550AmeasurestheaveragepowerofCWandmodulatedsignals,suchas: AM Twotone Multicarrier Pulsemodulation Digitalmodulation(QPSK,QAM,etc.) Forexample,ifanRFsignalispulsemodulatedat50Hzwitha10%dutycycleismeasuredwiththe averagingfactorsetto128,themeasuredpowerreadingwillbe10%ofthepeakpowerduringpulseON periods.Ifthesignalismodulatedatalowpulserate(belowabout1kHz),theGT8550Awill synchronizethereadingspreciselywiththestartofapulsesothateachdisplayedreadingisaveraged overawholenumberofpulses(therearenofractionalpulsesincludedinthemeasurement).This eliminatesasignificantamountofnoisefromthereadings.However,eventhoughthefiltersettlingtime hasbeensettoalongtimeconstantof2.56seconds,theupdaterateofthereadingwillbemuchfaster; eventhefirstreadingwillbeveryclosetothefullysettledvalue. 2.4.5 PulseAveragePower(PAP) ThePulseAveragePower(PAP)modeissimilartotheMAPmode,butitmeasurespulsemodulated signalshavingaknowndutycycle.SpecifythisdutycycleandtheGT8550Awillautomaticallycorrect themeasurementssothatthedisplayedreadingsindicatethepeakRFpowerduringpulseONperiods. Forexample,whenmeasuringapulsemodulatedsignalwith50%dutycycle,MAPmodewouldgivea reading3dBlowerthanthereadingthatwouldbegiven
