List and Sweep Mode
R&S
®
SMA100B
169User Manual 1178.3834.02 ─ 05
However, the time the instrument requires for the signal to settle reduces the set dwell
time:
t
dwell(effective)
= t
dwell
- t
setlting
If the dwell time in sweep or list mode is too short or external trigger signals come too
fast, the signal generation delays. As the delay increases, the R&S SMA100B signals
an overrun, or even stops sweep or list mode signal generation, if the delay gets too
long.
The instrument diplays corresponding error messages.
Hardware adjustments
The first time a list (new or modified) is processed, the instrument automatically calcu-
lates the necessary hardware settings. It can be performed during list processing, but
delays the first cycle, especially with short dwell times.
With long dwell times, you can perform this calculation while the list is being pro-
cessed; the entered dwell times are observed. With short dwell times, calculation of the
hardware settings increases the dwell time for the initial processing cycle; the entered
value is only observed from the second processing cycle onwards. In this case, a mes-
sage indicates that there is a deviation between the current and set dwell times. After
the first cycle, you do not need to perform additional calculations. The current dwell
times do not deviate from the set dwell times.
Blanking
The instrument applies blanking, which temporarily turns off the RF signal when the
frequency or level changes, until the signal has settled to a stable state.
Temporary blanking applies to all operating modes.
Live list processing mode
The R&S SMA100B 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.
This mode is optimized for maximum signal quality, and is useful if dwell times higher
than 2 ms are sufficient.
6.5 Sweep Mode Settings
This section lists the settings of all available sweep modes.
Sweep Mode Settings
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