Rohde & Schwarz ESW Series, User Manual

Page: 124 / 759

Measurements and Result Displays
R&S
®
ESW
124 User Manual 1177.6298.02 ─ 08
Selecting the search method (or "How the search is performed?")
The automatic peak search that is part of automated tests is an easy way to find
peaks: the R&S
ESW searches for peaks after the scan is done based on the condi-
tions you have defined for the peak search (peak excursion and limit margin). It then
writes the peaks into the peak list.
Alternatively, the R&S ESW allows you to edit peak lists and manually add or delete
frequencies. To create a peak list manually, you can, for example, use markers to
search for peaks, or, if you already know where peaks occur, add each frequency indi-
vidually.
Controlling the size of the peak list
The size of the peak list is variable. The peak list can contain up to 500 entries (= fre-
quencies). By default, the peak search adds peaks until the maximum size of the peak
list has been reached and regardless of the distribution of the peaks. If there are more
peaks than the size of the peak list allows for, the R&S
ESW removes the frequencies
with the smallest signal levels. If there are fewer peaks than the list allows for, the size
of the list is reduced accordingly.
The R&S ESW also provides the possibility to split the spectrum into several equidis-
tant subranges and look for a defined number of peaks in each subrange with the
result that peak list entries are distributed equally over the measurement range.
● Configuring a Peak Search ................................................................................... 124
● Modifying a Peak List ............................................................................................127
● Modifying a Peak List (Alternate Method) ............................................................. 129
9.3.4.1 Configuring a Peak Search
Access : "Overview" > "Test Automation" > "Peak Search"
Test Automation