Common Analysis and Display Functions
R&S
®
ESW
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User Manual 1177.6298.02 ─ 08
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Updating the marker position to the current peak value automatically after each
measurement (Auto Peak Search)
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Creating a fixed reference marker at the current peak value of a trace (Fixed Refer-
ence)
Note that the marker peak search is independent of the peak search available for auto-
mated test sequences. For more information, see
Chapter 9.3.4, "Performing a Peak
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.
Figure 11-7: Trace example
The following table lists the peaks as indicated by the marker numbers in the diagram
above, as well as the minimum decrease in amplitude to either side of the peak:
Marker Usage
