Spectrum Analyzer Measurement Guide : AM/FM/PM Analyzer (Option 509)
AM/FM/PM Analyzer (Option 509)
General Measurement Setup
Example FM Demodulation Measurement
AM / FM / PM Analyzer Menus
Map of Main Menus
Map of Frequency Menus
Map of Measurements Menus
Map of Audio Demod Menus
RF Freq (Frequency) Menu
RF Span Menu
(Signal) Standard List Menu
Amplitude Menu
Setup Menu
Measurements Menu
RF Spectrum Menu
Audio Spectrum AM Menu
Audio Waveform AM Menu
Audio Spectrum FM Menu
Audio Waveform FM Menu
Audio Spectrum PM Menu
Audio Waveform PM Menu
Coverage Mapping Menu
Mapping Save/Recall Menu
Measurement Setup Menu
Point Distance/Time Setup Menu
Audio Demod AM Menu
Audio Demod FM Menu
Marker Menu
Not all instrument models offer every option. Refer to the Technical Data Sheet of your instrument for available options.
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.