R&S FSW-K7, User Manual

Page: 152 / 407

Analysis
R&S
®
FSW-K7
152 User Manual 1173.9240.02 ─ 23
Maximum Number of Peaks
Defines the maximum number of peaks to be determined and displayed.
Remote command:
CALCulate<n>:MARKer<m>:FUNCtion:FPEaks:LIST:SIZE
on page 347
Peak Excursion
Defines the minimum level value by which a signal must rise or fall so that it is identi-
fied as a maximum or a minimum by the search functions.
Entries from 0 dB to 80 dB are allowed; the resolution is 0.1 dB. The default setting for
the peak excursion is 6 dB.
Remote command:
CALCulate<n>:MARKer<m>:PEXCursion
on page 338
Displaying Marker Numbers
By default, the marker numbers are indicated in the diagram so you can find the peaks
from the list. However, for large numbers of peaks the marker numbers may decrease
readability; in this case, deactivate the marker number display.
Remote command:
CALCulate<n>:MARKer<m>:FUNCtion:FPEaks:ANNotation:LABel[:STATe]
on page 346
Exporting the Peak List
The peak list can be exported to an ASCII file (
.DAT
) for analysis in an external appli-
cation.
Remote command:
MMEMory:STORe<n>:PEAK
on page 350
FORMat:DEXPort:DSEParator
on page 310
6.3.4.3 Measuring Characteristic Bandwidths (n dB Down Marker)
Access : "Overview" > "Analysis" > "Marker Functions" > "n dB down" > "n dB Down
Config"
Or : MKR FUNC > "Select Marker Function" > "n dB down" > "n dB down Config"
When characterizing the shape of a signal, the bandwidth at a specified offset from its
peak level is often of interest. The offset is specified as a relative decrease in ampli-
tude of n dB. To measure this bandwidth, you could use several markers and delta
markers and determine the bandwidth manually. However, using the n dB down
marker function makes the task very simple and quick.
The n dB down marker function uses the current value of marker 1 as the reference
point. It activates two temporary markers T1 and T2 located on the signal, whose level
is n dB below the level of the reference point. Marker T1 is placed to the left and
marker T2 to the right of the reference marker. The default setting for n is 3 dB, but it
can be changed.
Working with Markers in the R&S FSW Analog Demodulation application