頻率計(jì)HM8122廠家:德國惠美性能指標(biāo)pdfFrequencyRange:0-1600MHz;3Inputs9MeasurementFunctions;Ext.GateandArmingUpto9-digitResolutionat1secondGateTime100MHzTimeBasewith 0.5ppmStabilityTheHM8122isafeature-packedUniversalCounterand,likeallotherinstrumentsinthe8100Series,itispreparedforoperationinautomatedtestsystemsaswellasforlaboratorybench-topmeasurements.TheinstrumenthasthreesensitiveinputsandprovidessignalmeasurementcapabilityfromDCto1.6GHz.Animpressive10nsresolutionduringsinglepulsemeasurementismadepossiblebyusinga100MHzreferenceoscillator.Resolutionasfineas1psisobtainedthroughtimeintervalaveraging.TheHM8122displayslowfrequencymeasurementswithan8digitresolutionata1sgatetime.Besidesitsninebasicfunctions,theHM8122offerssuchpracticalfeaturesasapreselectablenumberofpulsesperrotation,offset,display-hold,single-shotmeasurement,externalportsforgating,arming,gate-viewandtrigger-view.TherearpanelinputsallowformeasurementsofchannelAgatedbyB.Anintegratedcalibrationroutineandextensivepower-upself-testensureproperandaccurateoperationofthecounter.Sinceanycounterisonlyasgoodasitsinputcircuitry,greatcarewastakeninconsideringthetechniqueofinputsignalconditioning.Thethreesignalinputspossess,dependinguponfrequencyrange,aninputsensitivityofbetween20mVand60mV.Aselectablelow-passfilter,switchableinputcoupling,two20dBattenuatorsperchannel,andtheswitchabletriggerslopeenhancetrouble-freeoperationwithnearlyallinputsignals.Automatictriggeringcanbeturnedoffforcomplexsignalmeasurements.