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Chapter VII AM-FM-PM Analyzer Mode (optional)
Section 1 Introduction to Typical Measurements
The AM-FM-PM analyzer mode is used for displaying the spectrum of AM, FM and PM signals and analyzing
relevant parameters. The main spectrum and relevant parameters are shown below:
RF spectrum: Similar to the spectrum analyzer mode, the frequency spectrum of the modulation signal will be
displayed, and the occupied bandwidth can be measured.
Audio spectrum: Display the frequency spectrum of the demodulated audio signal.
Audio waveform: Display the waveform of the demodulated audio signal within the time domain.
Parameter analysis: Measure and analyze the carrier power, modulation rate, carrier offset, modulation depth
(AM), modulation frequency offset (FM), modulation phase deviation (PM), S/N, modulation distortion and total
harmonic distortion of the modulated signal.
All operations in this chapter are based on the AM-FM-PM analyzer mode, which will not be separately described below.
Three spectrograms can be displayed at the same time or respectively in the AM-FM-PM analyzer mode. Press
[Measure] and select [RF Spectrum], [Audio Spectrum], [Audio Waveform] and [Summary] to display one or all
spectrum(s).
In order to better observe the measured signal, the following steps can be taken:
1) Press [Measure]→[Demod Type AM FM PM] to select the type of the analog signal to be demodulated.
2) Press [Frequency]→ [Center Freq] and set the center frequency of the measured signal.
3) Press [BW]→[IFBW], and set the appropriate IF bandwidth with the number keys or [↑] or [↓] key or knob.