Common Analysis and Display Functions
R&S
®
FSW
486User Manual 1173.9411.02 ─ 19
For n dB down markers, additional information is displayed, see chapter 7.4.1.9,
"Measuring Characteristic Bandwidths (n dB Down Marker)", on page 490.
Marker information in marker table
In addition to the marker information displayed within the diagram area, a separate
marker table may be displayed beneath the diagram. This table provides the following
information for all active markers:
Type Marker type: N (normal), D (delta), T (temporary, internal) and number
Ref Reference marker for delta markers
Trc Trace to which the marker is assigned
X-value X-value of the marker
Y-value Y-value of the marker
Function Activated marker or measurement function
Function Result Result of the active marker or measurement function
7.4.1.4 Searching for Signal Peaks
A common task in spectrum analysis is determining peak values, i.e. maximum or mini-
mum signal levels. The R&S FSW provides various peak search functions and applica-
tions:
●
Setting a marker to a peak value once (Peak Search)
●
Searching for a peak value within a restricted search area (Search Limits)
●
Creating a marker table with all or a defined number of peak values for one sweep
(Marker Peak List)
●
Updating the marker position to the current peak value automatically after each
sweep (Auto Peak Search)
●
Creating a fixed reference marker at the current peak value of a trace (Peak
Search)
Peak search limits
The peak search can be restricted to a search area. The search area is defined by limit
lines which are also indicated in the diagram. In addition, a minimum value (threshold)
can be defined as a further search condition.
When is a peak a peak? - Peak excursion
During a peak search, for example when a marker peak table is displayed, noise val-
ues may be detected as a peak if the signal is very flat or does not contain many
peaks. Therefore, you can define a relative threshold ("Peak excursion"). The signal
level must increase by the threshold value before falling again before a peak is detec-
ted. To avoid identifying noise peaks as maxima or minima, enter a peak excursion
value that is higher than the difference between the highest and the lowest value mea-
sured for the displayed inherent noise.
Marker Usage
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