280系列波形发生器Specificationsapplyat18-28ºCafter30minuteswarm-up,atmaximumoutputinto50Ω.ArbitraryWaveformsWaveformsMaximumwaveformsizeis65,536points;minimumwaveformsizeis4points.Upto100userdefinedwaveformsmaybestoredinthe256KpointnonvolatileRAM.WaveformscanbedefinedbyfrontpaneleditingcontrolsorbydownloadingofwaveformdataviaRS-232orGPIB.Waveformmemory64kpointsperchannelVerticalresolution12bitsSampleclock100mHzto40MHzResolution4digitsAccuracy±1digitofsettingSequencingUpto16waveformsmaybelinked.Eachwaveformcanhavealoopcountofupto32,768.Asequenceofwaveformscanbeloopedupto1,048,575timesorruncontinuously.OutputfilterSelectablebetween16MHzElliptic,10MHzElliptic,10MHzBesselornoneStandardWaveformsAllWaveformsAccuracy10ppmfor1yearTemp.stabilityTypically<1ppm/ºC.Outputlevel2.5mVto10Vppinto50ΩSine,Cosine,Haversine,HavercosineRange0.1mHzto16MHzResolution0.1mHzor7digitsHarmonicdistortion<0.1%THDto100kHz;<–65dBcto20kHz,<–50dBcto300kHz,<–35dBcto10MHz<–30dBcto16MHzNonharmonicspurii<–65dBcto1MHz,<–65dBc+6dB/octave1MHzto16MHzSquareRange1mHzto16MHzResolution1mHz(4digits)Accuracy±1digitofsettingRise/falltimes<25nsPulseandPulseTrainRise/falltimes<25nsPeriodrange100nsto100sPeriodresolution4digitAccuracy±1digitofsettingDelayrange–99.99sto+99.99sDelayresolution0.002%ofperiodor25ns,whicheverisgreaterWidthrange25nsto99.99sWidthresolution0.002%ofperiodor25ns,whicheverisgreaterTriangleRange0.1mHzto100kHzResolution0.1mHzor7digitsLinearityerror<0.1%to30kHzRampsandSin(x)/xRange0.1mHzto100kHzResolution0.1mHz(7digits)Linearityerror0.1%to30kHzNote:Thepulsewidthandabsolutevalueofthedelaymaynotexceedthepulseperiodatanytime.Repetitionrateissetbythepulsetrainperiod.OperatingModesOperatingModesContinuousWaveformrunscontinuouslyTriggeredBurstEachactiveedgeofthetriggersignalwillproduceoneburstofthewaveformCarrierwaveformsAllstandardandarbitraryMax.CarrierFrequency40Msamples/sforARBandSequence.1MHzorthemaximumfortheselectedwaveform.Numberofcycles1to1,048,575Triggerrepetition0.005Hzto100kHzinternaldcto1MHzexternalTriggersignalsourceInternalfromkeyboard,previouschannel,nextchannelortriggergenerator.ExternalfromTRIGINorremoteinterface.Triggerstart/stopphase±360°settablewith0.1°resolution,subjecttowaveformfrequencyandtypeGatedWaveformwillrunwhiletheGatesignalistrueandstopwhilefalseCarrierwaveformsAllstandardandarbitraryMax.carrierfrequency40Msamples/sforARBandSequence.1MHzorthemaximumfortheselectedwaveform.Numberofcycles1to1,048,575Triggerrepetition0.005Hzto100kHzinternaldcto1MHzexternalGatesignalsourceInternalfromkeyboard,previouschannel,nextchannelortriggergenerator.ExternalfromTRIGINorremoteinterface.Gatestart/stopphase±360°settablewith0.1°resolution,subjecttowaveformfrequencyandtypeSweepFrequencysweepcapabilityisprovidedforbothstandardandarbitrarywaveforms.Arbitrarywaveformsareexpandedorcondensedtoexactly4096pointsandDDStechniquesareusedtoperformthesweep.CarrierwaveformsAllstandardandarbitraryexceptpulse,pulsetrainandsequenceSweepmodeLinearorlogarithmic,triggeredorcontinuousSweepdirectionUp,down,up/downordown/upSweeprangeFrom1mHzto16MHzinonerange.Phasecontinuous.Independentsettingofthestartandstopfrequency.Sweeptime30msto999sMarkerVariableduringsweepSweeptriggersourceThesweepmaybefreerunortriggeredfromthefollowingsources:Manuallyfromkeyboard.ExternallyfromTRIGINinputorremoteinterface.SweepholdSweepcanbeheldandrestartedbytheHOLDkeyMultichannelsweepAnynumberofchannelsmaybesweptsimultaneouslybutthesweepparameterswillbethesameforallchannels.Amplitude,OffsetandWaveformcanbesetindependentlyforeachchannel.ToneSwitchingCapabilityprovidedforbothstandardandarbitrarywaveforms.Arbitrarywaveformsareexpandedorcondensedtoexactly4096pointsandDDStechniquesareusedtoallowinstantaneousfrequencyswitching.CarrierwaveformsAllexceptpulse,pulsetrainandsequenceFrequencylistUpto16frequenciesfrom1mHzto10MHzTriggerrepetitionrate0.005Hzto100kHzinternal.DCto1MHzexternal.Usablerepetitionrateandwaveformfrequencydependonthetoneswitchingmode.SourceInternalfromkeyboard,previouschannel,nextchannelortriggergenerator.ExternalfromTRIGINorremoteinterface.ToneswitchingmodesGatedThetoneisoutputwhilethetriggersignalistrueandstopped,attheendofthecurrentwaveformcycle,whilethetriggersignalisfalse.Thenexttoneisoutputwhenthetriggersignalistrueagain.TriggeredThetoneisoutputwhenthetriggersignalgoestrueandthenexttoneisoutput,attheendofthecurrentwaveformcycle,whenthetriggersignalgoestrueagain.FSKThetoneisoutputwhenthetriggersignalgoestrueandthenexttoneisoutput,immediately,whenthetriggersignalgoestrueagain.Using2channelswiththeiroutputssummedtogetheritispossibletogenerateDTMFtestsignals.TriggerGeneratorInternalsource0.005Hzto100kHzsquarewaveadjustablein10ussteps.3-digitresolution.AvailableforexternalusefromanySYNCOUTsocket.OutputsMainOutputs–OneforeachchannelOutputimpedance50ΩAmplitude5mVto20Vppopencircuit(2.5mVto10Vppinto50Ω).Amplitudecanbespecifiedopencircuit(hiZ)orintoanassumedloadof50Ωor600ΩVpkpk,VrmsordBm.Amplitudeaccuracy2%±1mVat1kHzinto50ΩAmplitudeflatness±0.2dBto200kHz;±1dBto10MHz;±2.5dBto16MHzDCoffsetrange±10Vfrom50Ω.Offsetplussignalpeaklimitedto±10VDCoffsetaccuracyTypically3%±10mV,unattenuatedResolution3digitsor1mVforbothamplitudeanddcoffsetSyncOut–OneforeachchannelMultifunctionoutputuserdefinableorautomaticallyselectedtobeanyofthefollowing:Waveformsync(allwaveforms)Asquarewavewith50%dutycycleatthemainwaveformfrequency,orapulsecoincidentwiththefirstfewpointsofanarbitrarywaveformPositionmarkersAnypoint(s)onthewaveformmayhaveassociatedmarkerbit(s)sethighorlowBurstdoneProducesapulsecoincidentwiththelastcycleofaburst.SequencesyncProducesapulsecoincidentwiththeendofawaveformsequence.TriggerSelectsthecurrenttriggersignal.Usefulforsynchronizingburstorgatedsignals.SweepsyncOutputsapulseatthestartofsweeptosynchronizeanoscilloscopeorrecorder.PhaselockoutUsedtophaselocktwogenerators.Producesapositiveedgeatthe0°phasepoint.OutputsignallevelTTL/CMOSlogiclevelsfromtypically50Ω.Cursor/markeroutAdjustableoutputpulseforuseasamarkerinsweepmodeorasacursorinarbitrarywaveformeditingmode.CanbeusedtomodulatetheZaxisofanoscilloscopeorbedisplayedonasecond‘scopechannel.OutputSignalLevel:Adjustablefromnominally2Vto14V,normalorinverted;adjustablewidthasacursor.Outputimpedance