N5161A/62A/81A/82A/83A MXG Signal Generators User's Guide

Basic Digital Operation (Option 651/652/654)Using Waveform MarkersExample of Correct UseWaveform: 1022 pointsMarker range: 95–97Marker polarity: PositiveThis example shows a marker set to sample the waveform’s area ofhighest amplitude. Note that the marker is set well before thewaveform’s area of lowest amplitude. This takes into account anyresponse difference between the marker and the waveform signal.Close–up of averagingThe ALC samples the waveform when the marker signal goeshigh, and uses the average of the sampled waveform to set theALC circuitry.Here the ALC samples during the on marker points (positivepolarity).MarkerMarkerExample of Incorrect UseWaveform: 1022 pointsMarker range: 110–1022Marker polarity: PositiveMarkerMarkerThis example shows a marker set to sample the low part of thesame waveform, which sets the ALC modulator circuitry forthat level; this usually results in an unleveled condition for thesignal generator when it encounters the high amplitude of thepulse.MarkerPulse UnleveledMarker158 Agilent N5161A/62A/81A/82A/83A MXG Signal Generators User’s Guide