User`s manual

Available Marker Sources
There are six marker sources available for output at the AFG’s front panel
“Marker Out” BNC and the ECL Trigger Lines. Use the
[SOURce:]MARKer:FEED <source> command to select the “Marker Out”
BNC; use
[SOURce:]MARKer:ECLTrg<n>:FEED <source> command to
select the ECL trigger lines.
The sources for the “Marker Out” BNC, not the ECL trigger lines, can
output the marker pulses as either active high (
NORMal) or active low
(
INVerted). Use the [SOURce:]MARKer:POLarity <polarity> command to
select the polarity.
The different marker sources are as follows:
ARM[:STARt|:SEQuence[1]][:LAYer[1]]
For arbitrary waveforms, the marker level changes with the first point on the
waveform of the first waveform repetition. The source then outputs a marker
pulse at the last waveform point of each repetition. For
SINUsoid outputs, the
marker is a 50% duty cycle square wave at the waveform frequency.
ARM[:STARt|:SEQuence[1]]:LAYer2
The AFG asserts a marker when triggering the first amplitude point after
receiving a start arm. The AFG unasserts a marker with the last amplitude
point of the last waveform repetition, or following an
ABORt.
[SOURce:]FREQuency[1]:CHANge
The source outputs a one sample period wide marker pulse after a frequency
change occurs. This shows that the steady state frequency was reached.
[SOURce:]LIST[1]
The source outputs marker pulses specified by the
[SOURce:]LIST[1][:SEGMent]:MARKer and
[SOURce:]LIST[1]:SSEQuence:MARKer commands. Increase the pulse size
by selecting marker output for consecutive points on the waveform. Can
only be used with arbitrary waveforms (see Chapters 3 and 7 on how to
generate arbitrary waveforms).
[SOURce:]PM:DEViation:CHANge
This source outputs a one sample period wide marker pulse after a phase
change occurs. This shows that the new phase was reached.
Chapter 6 Marker Outputs/Multiple AFG Operations 205