Keysight x-series Measurement Guide

144
Demodulating AM Signals
Measuring the Modulation Index of an AM Signal
Measuring the Modulation Index of an AM Signal
This procedure demonstrates how to use the signal analyzer as a fixed-tuned
(time-domain) receiver to measure the modulation index as a percent AM value of an
AM signal.
Step Action Notes
1 Set up the signal source. a. Set the source frequency to
300 MHz.
b. Set the source amplitudes to
−10 dBm.
c. Set the AM depth to 80%.
d. Set the AM rate to 1 kHz.
e. Turn AM on.
2 Connect an Keysight
ESG RF signal source to
the analyzer RF INPUT
as shown.
3 Select the mode. • Press Mode, Spectrum
Analyzer.
4 Preset the analyzer. • Press Mode Preset.
5 Set the center frequency,
span, RBW and the
sweep time.
a. Press FREQ Channel,
Center Freq, 300, MHz.
b. Press SPAN X Scale, Span,
500, kHz.
c. Press BW, Res BW, 30,
kHz.
d. Press Sweep/Control,
Sweep Time, 20, ms.

Keysight x-series Specifications

General

Analysis Bandwidth	Up to 1 GHz (depending on model)
Real-Time Bandwidth	Up to 1 GHz (depending on model)
Form Factor	Benchtop
Connectivity	LAN, USB, GPIB
Resolution Bandwidth	1 Hz to 10 MHz (depending on model)