intervaliscomputedandthesenumbersofsamplesaredisplay.TheDSOconsiderstheintervalasthefundamentaltimeperiodofthewholewaveformandthustakestbatmuchsamplesfromitsbufferandstartsdisplayingitinquicksuccession.Withsimplewaveformlikeasinewave,leveltriggercanachievestabledisplaybecausetriggerintervalcontainssamenumberofcycles.ThisisshowninFig.a.NowforthecomplexsignalasshowninFig.b,leveltriggeringproducesatriggerintervalhavingvariablenumberofcyclesforthesamenumberofsamples/timeresultinginavisuallyunstabledisplay.TheactualtriggerintervalshouldbeonecompletecycleforachirpsignalasindicatedinFig.c.Havingdonethistherepeatedchirpsignalforthistimedurationwillbedisplayedwithoutanyoverlappingcomponentsaslongastheentiretimeperiodisdisplayed.ToobservetheshortcomingsexperimentallyindisplayofcomplexsignalsontheoscilloscopeTektronixdualchannelsignalgeneratorAFG-(MS/s。
在某些情况下