AM/FM/PM Analyzer (Option 509)

Introduction

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

Note	Not all instrument models offer every option. Please refer to the Technical Data Sheet of your instrument for available options.

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.

 

 

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