User Manual

The Spectrum Application (RF Measurements)
R&S
®
FPL1000
379User Manual 1178.3370.02 ─ 09
Remote command:
SYSTem:SPEaker:VOLume on page 811
7.9.4.8 Marker Peak List
Access: "Overview" > "Analysis" > "Marker Functions" > "Marker Peak List"
Or: [MKR] > "Select Marker Function" > "Marker Peak List"
A common measurement task is to determine peak values, i.e. maximum or minimum
signal levels. The R&S FPL1000 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)
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.
Marker Usage