132 Chapter 4
Basic Digital Operation
Using Waveform Markers
Close-up of averaging
he ALC samples the waveform when the marker signal goes
igh, and uses the average of the sampled waveform to set the
LC circuitry.
ere the ALC samples during the on marker points (positive
olarity).
Marker
Marker
MarkerMarker
Example of Correct Use
Waveform: 1022 points
Marker range: 95-97
Marker polarity: Positive
This example shows a marker set to sample the waveform’s area of
highest amplitude. Note that the marker is set well before the
waveform’s area of lowest amplitude. This takes into account the
response difference between the marker and the waveform signal.
Pulse Unleveled
xample of Incorrect Use
aveform: 1022 points
arker range: 110-1022
arker polarity: Positive
his example shows a marker set to sample the low part of the
ame waveform, which sets the ALC modulator circuitry for
hat level; this usually results in an unleveled condition for the
ignal generator when it encounters the high amplitude of the
ulse.
Marker
Marker
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