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Keysight EXG and MXG X-Series Signal Generators User’s Guide
Basic Digital Operation (Option 653/655/656/657)
Using Waveform Markers
Close–up of averaging
The ALC samples the waveform when the marker
signal goes high, and uses the average of the
sampled waveform to set the ALC circuitry.
Here the ALC samples during the
on
marker points
(positive polarity).
Marker
Marker
Marker
Marker
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 any response
difference between the marker and the waveform signal.
Pulse Unleveled
Example of Incorrect Use
Waveform: 1022 points
Marker range: 110–1022
Marker polarity: Positive
This example shows a marker set to sample the low
part of the same waveform, which sets the ALC
modulator circuitry for that level; this usually results
in an unleveled condition for the signal generator
when it encounters the high amplitude of the pulse.
Marker
Marker
