509
Keysight Handheld Analyzers
N99xxA User’s Guide
25 AM/FM Metrics (SA Only and Option 355)
In this Chapter
Using AM/FM Metrics
Using FieldFox’s analog demodulation, users maintaining AM/FM radio
systems can demodulate and characterize AM and FM signals. They can tune
to the signal and listen to the audio tones using FieldFox’s built-in speakers or
a headphone. They can also display the RF spectrum, the demodulated
waveform and AM/FM metrics such as carrier power, modulation rate, and
SINAD.
AM/FM Metrics enables you to make the following measurements:
And, can be enabled/disabled simultaneously with Tune and Listen.
Overview of Measurement Types
If you are familiar with the AM/FM measurements and terms, skip to “How to
Set Up AM/FM Metrics” on page 512.
The FieldFox assumes you have manually set up the CF, span, and
amplitude settings. Refer to Chapter 9, “SA (Spectrum Analyzer) Mode.”
“Using AM/FM Metrics” on page 509
“SINAD and THD Calculations” on page 516
“Interpreting AM/FM Metrics Error Messages” on page 519
AM Measurements: — AM Measurements: Carrier power, AM rate, AM modulation
index
FM Measurements: — FM deviation (peak and RMS), Modulation Rate, Carrier power,
Demodulated voltage, SINAD, THD (total harmonic distortion)
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