Instrument Function
R&S
®
SMB100A
148Operating Manual 1407.0806.32 ─ 13
Setting a sweep
A sweep is set in five basic steps which are shown below taking a frequency sweep as
an example.
The LF sweep is activated and configured in the "Mod Gen" block.
1. Set the sweep range ("Start Freq" and "Stop Freq" or "Center Freq" and "Span").
2. Select linear or logarithmic sweep spacing ("Spacing").
3. Set the step width ("Step Lin/Log") and dwell time ("Dwell Time").
4. Activate the sweep ("Mode" to Auto, Single, Step or Extern Single, Extern Step).
5. Trigger the sweep, except for Auto mode ("Execute Single Sweep", Current Fre-
quency or External Trigger Signal).
It is recommended to switch off the GUI update for optimum sweep performance espe-
cially with short dwell times (see chapter 5.2.3.5, "Gui Update", on page 86).
5.3.7.2 RF Frequency Sweep
The dialog is used to activate and configure a sweep for the RF frequency.
To open the "Frequency Sweep" menu, select "RF > Configure > RF Frequency
Sweep" or use the menu tree of the MENU key under "RF".
In the top section of the menu, the RF sweep is activated and the sweep mode is selected.
The buttons are used to reset the RF sweep (all sweep modes) or to execute the RF
sweep ("Single" mode).
The sweep range, sweep spacing and dwell time are set in the bottom section.
For the frequency sweep, an output signal at the LF connector can be activated. It pro-
vides a linear voltage ramp from start to stop of the sweep. The output voltage can be
used e.g. to control an oscilloscope.
The sweep range of the RF sweep can be entered in two ways, either by entering the
"Start" and "Stop" value or by entering the "Center" and "Span".
The two sets of parameters influence each other in the following way:
●
"Start Freq" = "Center Freq" - "Span"/2
●
"Stop Freq" = "Center Freq" + "Span"/2
●
"Center Freq" = ("Start Freq" + STOP FREQ)/2
●
"Span" = "Stop Freq" - "Start Freq"
RF Block
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