Configuring the RF signal
R&S
®
SMM100A
321
User Manual 1179.1341.02 ─ 05
The list mode is especially useful in high-speed measurements with fast changing
frequency and level settings.
Note that the shown diagrams represent the behaviour in theory. In real signal genera-
tion, the instruments usually have a blank time when the frequency or level changes.
Interactions and characteristics of list and sweep mode
●
Activating the list mode automatically deactivates all RF and LF sweeps and vice
versa.
●
In list processing mode, the frequency and level display in the status bar is dis-
abled.
●
The sweep modes only work with a
global
dwell time, that means the time intervals
are constant during signal generation.
●
If you want to hold a running sweep at a specific frequency or level value, enter the
value in the status bar. The sweep stops immediately.
●
We recommend that you switch off the display update for optimum sweep perfor-
mance, especially with short dwell times
See
Chapter 11.1.3, "Display update settings"
7.10.1
Signal generation and triggering in the sweep and list modes
In both operating modes "List" and "Sweep", triggering and signal generation follow the
same principle. The instrument generates the signal continuously (that means trig-
gered automatically) or in individual steps (controlled manually by an internal or exter-
nal trigger signal).
The instrument expects the trigger signal at the Inst Trig connector.
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
SMM100A signals
an overrun, or even stops sweep or list mode signal generation, if the delay gets too
long.
The instrument diplays corresponding error messages.
The figures in this section give an overview on the signal generation in the sweep and
list modes and the appropriate triggering. The figures show the signal state after acti-
vating the mode and the generation of the signal when a trigger event occurs. For each
mode, the relevant parameters and settings are briefly explained.
Each "Sweep" and "List" mode dialog provides also a "Reset" function that sets the sig-
nal to the initial value or the beginning of the list. Depending on the selected trigger
mode, the signal generation proceeds accordingly.
Varying the RF signal in list or sweep mode
