R&S FSW Series, Руководство пользователя

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Common Analysis and Display Functions
R&S
®
FSW
579 User Manual 1173.9411.02 ─ 43
Analyzing Several Traces - Trace Mode
If several sweep are performed one after the other, or continuous sweep are per-
formed, the trace mode determines how the data for subsequent traces is processed.
After each sweep, the trace mode determines whether:
●
The data is frozen (View)
●
The data is hidden (Blank)
●
The data is replaced by new values (Clear Write)
●
The data is replaced selectively (Max Hold, Min Hold, Average)
Each time the trace mode is changed, the selected trace memory is cleared.
The trace mode also determines the detector type if the detector is set automatically,
see
"Mapping Samples to sweep Points with the Trace Detector" on page 575.
The R&S FSW supports the following trace modes:
Table 9-4: Overview of available trace modes
Trace Mode Description
Blank Hides the selected trace.
Clear Write Overwrite mode: the trace is overwritten by each sweep. This is the default setting.
All available detectors can be selected.
Max Hold The maximum value is determined over several measurements and displayed. The
R&S
FSW saves the sweep result in the trace memory only if the new value is greater
than the previous one.
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.
Min Hold The minimum value is determined from several measurements and displayed. The
R&S
FSW saves the sweep result in the trace memory only if the new value is lower
than the previous one.
This mode is useful for example 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.
This mode is not available for statistics measurements.
Average The average is formed over several measurements and displayed.
The Sweep/Average Count determines the number of averaging procedures.
This mode is not available for statistics measurements.
View The current contents of the trace memory are frozen and displayed.
If a trace is frozen ("View" mode), the measurement settings, apart from scaling set-
tings, can be changed without impact on the displayed trace. The fact that the dis-
played trace no longer matches the current measurement settings is indicated by a yel-
low asterisk on the tab label.
Trace Configuration