Configuring the Internal Baseband Source
R&S
®
SMBV100B
194
User Manual 1178.4460.02 ─ 03
It is also possible to create and output a blank segment, i.e. segments containing a
zero signal.
Typical applications for the multi-segment mode are described in section
ter 3.7.4, "How to Create and Work with the Multi-Segment Waveform Files"
3.7.2.1
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.
3.7.2.2
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
SMBV100B 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.
3.7.2.3
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
SMBV100B cre-
ates 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
SMBV100B stores it under a user definable name; as with the standard wave-
forms, the used file extension is
*.wv
. The instrument appends additional informa-
tion to the header of the composed waveform file, e.g. user comments.
Generating Multi-Segment Waveform Files
