Setting Traces – TRACE Key R&S FSL
1300.2519.12 4.40 E-11
To specify the trace settings
1. Press the Trace 1 2 3 4 5 6 softkey to select the trace.
2. Press the Trace Mode softkey to select the trace mode for the selected trace (for details see "Trace
mode overview" on page 4.40).
3. Press the Detector Auto Select softkey for automatic detector selection or press the Detector
Manual Select softkey to select a detector (for details see "Detector overview" on page 4.42).
4. To change the sweep count setting, which also determines trace averaging, press the Sweep
Count softkey.
5. To deactivate the reset of the traces in Min Hold and Max Hold mode after some specific
parameter changes, press the Hold/Cont softkey.
6. To copy a trace into another trace memory, press the Copy Trace softkey.
Upon copying, the contents of the selected memory are overwritten and the new contents are
displayed in the View mode.
7. To export the active trace in ASCII format:
– Press the More softkey.
– If necessary, press the Decim Sep softkey to change the decimal separator with floating–point
numerals.
– Press the ASCII File Export softkey to enter the ASCII file export name.
The active trace is saved in ASCII format on the flash disk or a USB device.
Trace mode overview
The traces can individually be activated for a measurement or frozen after completion of a
measurement. Traces that are not activated are hidden. Each time the trace mode is changed, the
selected trace memory is cleared.
The R&S FSL offers 6 different trace modes:
• Clear Write
Overwrite mode: the trace is overwritten by each sweep. All available detectors can be selected.
This is the default setting.
• Max Hold
The maximum value is determined over several sweeps and displayed. The R&S FSL saves the
sweep result in the trace memory only if the new value is greater than the previous one. The
detector is automatically set to Positive Peak.
This mode is especially useful with modulated or pulsed signals. The signal spectrum is filled up
upon each sweep until all signal components are detected in a kind of envelope.
This mode is not available for statistics measurements or if the TV trigger is active and the TV Free
Run On/Off softkey is set to ON (option TV Trigger, B6).
• Min Hold
The minimum value is determined from several measurements and displayed. The R&S FSL saves
for each sweep the smallest of the previously stored/currently measured values in the trace
memory. The detector is automatically set to Negative Peak.
This mode is useful e.g. for making an unmodulated carrier in a composite signal visible. Noise,
interference signals or modulated signals are suppressed whereas a CW signal is recognized by its
constant level.
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