R&S FSW-K7 User Manual page 174

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R&S FSW-K7
Figure 9-7: FM spectrum and Result Summary including SINAD and THD values
From the FM spectrum, the SINAD and THD are also calculated and displayed in
the Result Summary.
12. Since the "AF Auto Scale" function is enabled, the "FM Spectrum" diagram is
scaled according to the current measurement automatically. Each diagram is
scaled individually, so that the reference values at the top of the two diagrams can
differ (100 kHz in the "FM Time Domain" versus 50 kHz in the "FM Spectrum".
However, you can adjust the values manually.
a) Select the "FM Spectrum" window to set the focus in it.
b) Press the AMPT key and select the "Scale Config" softkey.
c) Disable the "AF Auto Scale" function.
d) Define the new reference value (at 100% = top of the diagram) as 100 kHz.
User Manual 1173.9240.02 ─ 23
Measurement Example: Demodulating an FM Signal
174