Spectrum Analyzer MG PN: 10580-00349 Rev. H 7-1
Chapter 7 — AM/FM/PM Analyzer
(Option 509)
7-1 Introduction
This chapter presents information and procedures that are used to make measurements
when using the optional AM/FM/PM Analyzer mode (Option 509).
The AM/FM/PM Analyzer provides display and analysis of the key characteristics of analog
AM, FM, and PM modulated signals. The AM/FM/PM Analyzer provides the following
displays:
1. RF Spectrum shows the RF Spectrum graph, which is similar to Spectrum Analyzer
mode with carrier power, carrier frequency, and occupied bandwidth measurements.
To get to this view, select the Measurements menu and then press RF Spectrum. To
change the occupied bandwidth measurement, press RF Spectrum again and make
changes as desired.
2. Audio Spectrum shows the demodulated audio spectrum along the with the following
measurements: Rate, RMS, Pk-Pk/2, SINAD, THD, and Distortion/Total. To change
X-axis values to 2 kHz, 5 kHz, 10 kHz, 20 kHz, 70 kHz, or 140 kHz, press
Audio Spectrum again and change Span. When analyzing FM and PM, the reference
Y-axis value is also scalable.
3. Audio Waveform displays the time-domain demodulated waveform along with Rate,
RMS, Pk-Pk/2, SINAD, THD, and Distortion/Total measurements. The X-axis value
can be changed by pressing Audio Waveform and changing the Sweep Time. When
analyzing FM and PM, the reference Y-axis value is also scalable.
4. Summary displays all of the above mentioned measurements from RF Spectrum as
well as the demodulated signal.
5. AM/FM/PM Coverage Mapping (Option 431 and Option 31 also required) allows
users to map SINAD and Carrier Power measurements in a given geographical area.
Note that Option 31 is not required for indoor mapping.
Note
Not all instrument models offer every option. Refer to the Technical Data Sheet of
your instrument for available options.
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