R3132 Series Spectrum Analyzer Operation Manual
2.3.10 FM Demodulation Function (OPT73)
2-97
2.3.10 FM Demodulation Function (OPT73)
This section explains how to measure FM modulation signal characteristics (FM deviation, sensitivity and
linearity measurements).
Measurement conditions: The signal to be measured is a triangle modulation signal (of an FM frequency
of 10 Hz, and an FM deviation of 2.6 kHz) with a center frequency of 200.003 MHz, a level of 0 dBm.
Use appropriate parameter values to make the measurements shown below.
Setup
1.
Connect the analyzer and the unit under test as shown in Figure 2-98.
Figure 2-98 Setup for Measurements Using the FM Demodulation Function
Power on
2.
Turn the analyzer power and the unit under test power on.
Initializing the set conditions
This resets the current settings to the factory defaults.
3.
Press SHIFT and CONFIG(PRESET).
The factory defaults are loaded.
Setting the measurement conditions
This changes the analyzer settings so that the input signal is displayed more clearly.
4.
Press FREQ, 2, 0, 0, ., 0, 0, 3 and MHz.
A center frequency of 200.003 MHz is set.
5.
Press UTILITY and FM Demod.
The FM demodulation function is turned on.
6.
Press Demod Cal and All.
The calibration prior to an FM demodulation measurement is performed.
R3132 Series
Spectrum analyzer
Trigger output
RF output
Unit under
test
RF INPUT
External
Trigger
