Configuring the RF Signal
R&S
®
SMW200A
507User Manual 1175.6632.02 ─ 30
Learn List Mode Data list processing mode
Before signal generation starts, the instrument reads the values of the data list in
sequence and determines the corresponding hardware settings for each value pair.
Along with the current RF state and the modulation settings, the function stores the list
data in the temporary memory.
Once the entire table is processed, the R&S SMW starts signal generation by replaying
the stored values from the list. Thus, it achieves fast switching of the RF signal with
high accuracy.
This mode provides optimized switching times, and is particularly useful if dwell times
of less than 2 ms are required.
However, consider that R&S SMW generates the signal from the saved data, thus
reflecting the state of the instrument at the time of recording. Modifications of settings
during list processing are ignored. If you turn off the instrument, the list file remains
saved on the internal memory, but not the learned data in the temporary memory.
Consider also, that processing learned list mode data is not available when options
R&S SMW-B711/-B721 are installed. In this configuration, the R&S SMW automatically
switches to "Live list processing mode" on page 507.
When to use the "Learn List Mode Data" function
The instrument performs the learning process in the following situations:
●
RF state is on (prerequisite)
●
You deliberately activate this function, provided a list is loaded and RF is on.
●
You switch list mode on in "Learned" run mode and no data is available in the
memory
●
You change the list data file
Perform the list mode learning in the following situations:
●
Always when:
– You change any value in the list.
– Any hardware setting changes.
Especially if you have fluctuating environmental conditions, the hardware set-
tings need to be adjusted.
●
We recommend that you learn the list before activating the list mode, even if the list
has been learned previously.
Live list processing mode
The R&S SMW generates the signal directly from the value pairs in the database, and
adjusts the hardware settings accordingly. The current instrument state and thus any
change during the signal generation directly affects the RF signal. The temporary
memory is not used.
You can conveniently modify parameters like modulation settings during run-time.
Learning list mode data is not required. Impacts like temperature drift are also consid-
ered immediately.
Varying the RF Signal in List or Sweep Mode
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