Configuring the Internal Baseband Source
R&S
®
SMW200A
353User Manual 1175.6632.02 ─ 30
5.10.2.1 Multi-Segment Waveforms Processing
Processing of the waveform is triggered by the "Create" or "Create and Load" function.
To process the waveform, the instrument loads the entire multi-segment waveform into
the memory. It is therefore possible to alternate between the individual waveforms with-
out delay due to loading. You can define the output order of the segments, and the
segment intended to be output at any given moment.
When the created waveform is loaded, the graphical interface displays information on
clock rate, number of samples and creation day. You can also acquire information
about the waveform in the dedicated "Waveform Info" dialog.
5.10.2.2 ARB Sequencer Mode
If high switch over speeds is required, the test signals can be continuously scrolled
through with the aid of an external trigger or by applying a predefined “Play List”. The
R&S SMW provides the possibility to define a sequence of different segments and to
determine whether a segment is played once or repeated several times and to adjust
the transition between the segments.
For the correct and fast processing and for seamless transition between the multiple
waveforms, segments with a common sample rate are required. If the combined wave-
forms features different sample rates, they have to be adapted to a common sample
rate by resampling. Another advantage of this procedure is the scaling of the instanta-
neous amplitude of the various waveforms to a common RMS level.
5.10.2.3 File Concept
To provide flexible configuration, the building of a composed multi-segment waveform
file involves different stages; by completing of each of them, the R&S SMW creates
and stores a dedicated file. The following files are used:
●
Configuration list: is a dedicated file with details on how a multi-segment wave-
form is made up from different waveforms, the level and the clock rate settings, and
the filename. The file extension is *.inf_mswv.
You can create any number of configurations as a basis for defining further multi-
segment waveforms.
●
Output file: is the created output multi-segment waveform file. The R&S SMW
stores it under a user definable name; as with the standard waveforms, the used
file extension is *.wv. The instrument appends additional information to the header
of the composed waveform file, e.g. user comments.
●
Sequencing list: are files created in the "Multi Segment Waveform Sequencing"
dialog, i.e. when the ARB sequencer mode is used (see Chapter 5.10.2.2, "ARB
Sequencer Mode", on page 353).
The sequencing list file has an extension *.wvs and is automatically assigned to
but independent from the multi-segment file. By default, both files have the same
name and are located in the same file directory. You can create more than one
sequencing list file per multi-segment waveform file.
The sequencing list file carries information only about the segment number, the
corresponding waveform filenames are retrieved from the assigned multi-segment
Generating Multi-Segment Waveform Files
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