Analog Demodulation
R&S
®
FPC
148User Manual 1178.4130.02 ─ 07
The demodulation starts directly after you have selected the measurement type. By
default, the R&S FPC displays the results in a numerical result display, but you can
also display the results in graphical result displays.
Selecting the result display
Both measurement types support a numerical and a graphical result display. Both
result displays are based on the same measurement data (signal processing is also
the same), but display the results in a different format.
1. Press the "Meas" key to open the measurement menu.
2. Select the domain of the signal you want to demodulate.
3. Select the result display.
● "Mod. Trace": Shows the signal characteristics graphically in a diagram.
Figure 16-1: Trace display of an AM signal
The x-axis shows the demodulation characteristics of the signal over time. The
y-axis shows the modulation depth in % (AM signals) or the frequency devia-
tion in Hz (FM signals). The carrier frequency (center frequency) of the signal is
indicated in the diagram footer.
The diagram header contains the most important signal characteristics in
numerical form. These numerical values are also part of the numerical result
summary. Note that the numbers may be in a red font - a red font indicates a
violated limit if you have turned on a limit check.
● "Mod. Summary": Shows the signal characteristics numerically in a table.
For a detailed description of the individual values, see "The numerical result
summary" on page 148.
The numerical result summary
The numerical result summary shows various aspects of the demodulated signal in
numerical form.
Measurements and Result Displays
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