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Basic Digital Operation
Using Waveform Markers
Marker Signal Response
The source aligns the marker signals with the I and Q signals at the baseband
generator. However some settings such as amplitude, filters, and so forth
within the RF output path can create delays between the marker TRIGGER 2
output signal and the modulated RF output. When using the marker TRIGGER
2 output signal, observe the signals (marker relative to modulated RF) for any
latency, and if needed, reset the marker point positions, include delay or both.
Marker File Generation
Downloading a waveform file that does not have a marker file associated with it
causes the source to automatically create a marker file, but does not place any
marker points.
Marker Point Edit Requirements
Before you can modify a waveform segment marker points, the segment must
reside in ARB memory (see
on page
Saving Marker Polarity and Routing Settings
Marker polarity and routing settings remain until you reconfigure them, preset
the source, or cycle power. To ensure that a waveform uses the correct settings
when it is played, set the marker polarities or routing (Pulse/RF Blanking) and
save the information to the file header
Selecting which Marker to output
To select which one of the four markers is output at the TRIGGER 2 connector:
1. Select Input/Output key and Trigger Ouput tab.
2. Press Trig 2 Out keys.
3. Press Trig 2 Out key, click Source Marker 1, Source Marker 2, Source
Marker 3, or Source Marker 4 key as required to choose which marker to
output.
Viewing a Marker Pulse
When a waveform plays, you can detect an enabled marker pulse at the rear
panel TRIGGER 2 connector. This example demonstrates how to view a marker
pulse generated by a waveform segment that has at least one marker point set.
The process is the same for a waveform sequence.
Source User's Guide
"Loading a Waveform Segment into ARB memory"
29).
When you use a waveform that does not have marker routings and polarity settings
stored in the file header, and the previously played waveform used Pulse/RF
Blanking, ensure that you set Pulse/RF Blanking to
result in no RF output or a distorted waveform.
(page
31).
None
. Failure to do so can
35
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