Configuring the Internal Baseband Source
R&S
®
SMW200A
356User Manual 1175.6632.02 ─ 30
* = To simplify the description, an internal next segment trigger event ("Exec. Next Segment") and an
internal trigger event ("Execute Trigger") are used; an external trigger event has the same effect on
the signal generation.
1, 2 = Any next segment trigger event (internal or external) causes a switch over to the subsequent available
segment in the waveform. The currently output segment (segment filename and segment index) is
indicated at "Current Segment".
3 = When the last segment of the multi-segment waveform is output, the sequence starts again with the
output of the first segment after the subsequent trigger event. Hence, a sequence of external next
segment trigger events can be used to cyclically output the segments in the multi-segment file.
Defining Next Segment Source
As with the standard trigger system, provided are the following two sources for the next
segment signal:
●
Internal: the switch over to the subsequent segment is triggered manually with the
"Execute Next Segment" function.
To trigger a switch over to any segment within the multi-segment waveform,
change the value of the parameter "Segment".
●
External: the instrument expects a trigger event ("Global Next Segment") on one of
the two provided and configured USER connectors.
Defining the Subsequent Segment
By default, the instrument replays the segments in incremental order, e.g. Segment#1,
Segment#2, etc. If other order is required, use one of the following possibilities to
define the segment to be played next:
●
Next Segment: defines the subsequent segment while triggering the segments
manually, i.e. by "Next Segment Source > Internal"
●
Sequencing List: the subsequent segment is defined in the selected play list.
Defining the Transition between the Segments
The R&S SMW provides the parameter "Next Segment Mode" to define the transition
to the subsequent segment (see the graphs in Transition examples).
●
Next Segment: by receiving a Next Segment Event, the ARB aborts immediately
the playing of the current waveform and starts playing the next segment waveform
(see Table 5-20).
●
Next Segment Seamless: by receiving a Next Segment Event, the ARB com-
pletes the processing of the current waveform before starting the next segment
waveform (see Table 5-20).
Use this setting to avoid signal gaps and wrap-around problems. Seamless transi-
tion requires segments with equal clock rates.
Another way to generate a multi-segment signal without signal gaps between the
segments is to use the provided ARB sequencer mode (see Chapter 5.10.3.4,
"Multi-Segment Waveform Sequencing", on page 365).
The Table 5-20 shows two examples of the transition from a sine-wave signal segment
to a sawtooth segment (I channel, upper curve) in the case of next segment external
triggering. The left graphic displays an abrupt transition; the right graphic, the seam-
less transition case.
Generating Multi-Segment Waveform Files
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