Configuring the RF signal
R&S
®
SMM100A
334
User Manual 1179.1341.02 ─ 05
7.10.4
Significant parameters and functions
This section provides some basic parameters, settings and functions that affect the
operating modes CW, list and sweep, that means at all frequency and level transitions
of the RF signal.
Dwell time
Dwell time is the length of time that elapses from the beginning until the end of a step
in list or sweep mode.
Figure 7-15: Dwell Time vs. settling time
1 = "Dwell Time" (as set with the parameter)
2 = Settling time
3 = Dwell time (effective)
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
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.
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.
Varying the RF signal in list or sweep mode
