Spectrum Measurements
R&S
®
ESRP
385
User Manual 1175.7445.02 ─ 08
9. Reduce the span, e.g. using the rotary knob.
Specifying the Suitable Peak Excursion
1. If the
softkey is used, the default value is sufficient, since, in this
mode, the next lower maximum or next higher minimum will always be detected.
2. If the < or > of the softkey
is used, the 6 dB level change set as a
default value may already be attained by the inherent noise of the instrument. 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 Different Peak Excursion Settings (Example)
The following figure shows a trace to be examined.
Figure 6-21: Trace example
The following table lists the signals as indicated by the marker numbers in the diagram
above, as well as the minimum of the amplitude decrease to both sides of the signal:
Signal #
Min. amplitude decrease to both sides of the signal
1
30 dB
2
29.85 dB
3
7 dB
4
7 dB
Analysis
