Common Analysis and Display Functions
R&S
®
FSW
492
User Manual 1173.9411.02 ─ 19
Band power markers are only available for standard frequency measurements (not
zero span) in the Spectrum application.
The entire band must lie within the display. If it is moved out of the display, the result
cannot be calculated (indicated by "-
-
-" as the "Function Result"). However, the width
of the band is maintained so that the band power can be calculated again when it
returns to the display.
All markers can be defined as band power markers, each with a different span. When a
band power marker is activated, if no marker is active yet, marker 1 is activated. Other-
wise, the currently active marker is used as a band power marker (all other marker
functions for this marker are deactivated).
If the detector mode for the marker trace is set to "Auto", the RMS detector is used.
7.4.1.11
Demodulating Marker Values and Providing Audio Output
The R&S
FSW provides demodulators for AM, FM and PM signals. The demodulation
marker function sends the demodulated data at the current marker frequency to the
audio output. Thus, a displayed signal can be identified acoustically through the use of
the internal loudspeaker or with headphones.
This function is not available for Spectrum Emission Mask measurements.
The sweep stops at the frequency determined by marker 1 for the selected time and
the RF signal is demodulated in a bandwidth that corresponds to the RBW. Alterna-
tively, demodulation can be activated continuously, i.e. audio output occurs regardless
of the marker position and the marker stop time. For measurements in the time domain
(zero span), demodulation is always continuous.
Optionally, a mimumum level ("Squelch level") can be defined so that the signal is only
demodulated when it exceeds the set level. This is useful during continuous demodula-
tion to avoid listening to noise.
Marker Usage
