R&S FSW-K7 User Manual page 149

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R&S FSW-K7
6.3.4.2 Marker Peak List
Access: "Overview" > "Analysis" > "Marker Functions" > "Marker Peak List"
Or: MKR FUNC > "Marker Peak List"
A common measurement task is to determine peak values, i.e. maximum or minimum
signal levels. The R&S FSW provides various peak search functions and applications:
●
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 (Fixed Refer-
ence)
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.
Effect of peak excursion settings (example)
The following figure shows a trace to be analyzed.
User Manual 1173.9240.02 ─ 23
Working with Markers in the R&S FSW Analog Demodulation application
Analysis
149