Configuring the RF Signal
R&S
®
SMW200A
506User Manual 1175.6632.02 ─ 30
Figure 8-16: 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 SMW 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.
If you disable this blanking, the signal is not turned off during transition, but a tempo-
rary loss of power still occurs while the instrument adjusts the hardware. The power
level immediately increases and can exceed the set level value before the hardware
controls take effect. However, the time until the signal is stable and automatically level
controlled is shorter than the time of the blanking interval.
Temporary blanking applies to all operating modes.
Varying the RF Signal in List or Sweep Mode
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