Rohde & Schwarz R&S FSL3 - Page 191

Selecting the Frequency and Span – FREQ Key R&S FSL
1300.2519.12 4.6 E-11
To specify the frequency axis by the start and stop frequency
1. Press the Start softkey and enter a start frequency.
2. Press the Stop softkey and enter a stop frequency.
To specify the frequency axis by the center frequency and the span
3. Press the FREQ key and enter a center frequency in the Frequency Center edit dialog box.
4. Press the SPAN key and enter the bandwidth you want to analyze.
Note: Entering a value of 0 Hz will cause a change to the zero span analysis mode.
To specify the step size for the arrow keys and the rotary knob
1. Press the CF Stepsize softkey.
The softkeys are displayed according to the selected frequency span (zero span or span > 0).
2. To define the step size of the center frequency:
– Only if span > 0: Press 0.1*Span, 0.5*Span or x*Span to define the step size for the center
frequency as percentage of the span.
– Only if span = 0: Press 0.1*RBW, 0.5*RBW or x*RBW to define the step size for the center
frequency as percentage of the resolution bandwidth.
– Press the =Center softkey to set the step size to the value of the center frequency and to
remove the dependency of the step size to span or resolution bandwidth.
– Press the =Marker softkey to set the step size to the value of the marker and to remove the
dependency of the step size to span or resolution bandwidth.
– Press the Manual softkey and enter a fixed step size for the center frequency.
Note: The step size assigned to arrow keys corresponds to the selected value; the step size of the
rotary knob is
1
/
10
of it.
To modify the frequency axis by an offset
 Press the Frequency Offset softkey and enter the offset to shift the displayed frequency span.
To track signals (only possible if span >0)
1. Press the Signal Track softkey.
The softkeys of this submenu are displayed to start and stop signal tracking with specified
parameters.
2. Press the Track On/Off softkey to switch signal tracking on or off.
3. Press the Track BW softkey and enter a bandwidth for signal tracking.
4. Press the Track Threshold softkey and enter the threshold for signal tracking.
5. Press the Select Trace softkey and select the trace for signal tracking.