Spectrum Analyzer Measurements 3-21 AM/FM Modulation Measurement (Option 509)
Spectrum Analyzer MG PN: 10580-00447 Rev. H 3-107
1. The status panel provides quick access to common spectrum analyzer settings. See “STATUS PANEL (AM/FM
Audio)” on page 3-111.
2. The audio spectrum displays the frequency spectrum of the demodulated audio signal. It displays depth (%) in
amplitude modulation, and deviation (Hz) in frequency modulation.
3. The RF spectrum graph represents the minimized view of the RF spectrum view.
4. The demodulation marker is used to select the audio signal in the RF frequency domain. Toggle on DEMOD
MKR button to analyze the audio signal.
5. The full screen icon displays the maximized view of the selected graph with audio results table displayed at the
bottom. Touch exit full screen icon to exit the full screen view. Note that when the audio results table is viewed in
full screen the corresponding graphs are not displayed at the bottom of the screen.
6. The SETUP menu is where the AM/FM demodulation settings are configured. See “SETUP Menu (AM/FM
Audio – All Measurements View)” on page 3-110.
7. The audio results displays several numerical measurements such as SINAD (Signal-to-Noise and Distortion
Ratio), THD (Total Harmonic Distortion), Upper/Lower AM depth etc. It also includes the fundamental and
harmonic markers in addition to X and Y axes coordinates of the marker locations.
8. This drop-down menu allows you to switch between marker table and audio results display. Note that Marker
Table is only visible when MARKER TABLE is toggled on in MARKER menu.
9. The audio time domain graph also referred as oscilloscope, represents the AM depth (%) or FM deviation (Hz) of
the audio signal versus time.
Figure 3-87. AM/FM Audio – All Measurements View
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