R3267 Series Spectrum Analyzer Operation Manual (Vol.1)
2.3.12 Measuring Frequency deviation of FM Signals
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2.3.12 Measuring Frequency deviation of FM Signals
This section describes how to measure frequency deviation and modulation index used for FM transmitters
and so on.
Measurement conditions: The target of the measurement below is a signal whose input signal character-
istics consist of an output frequency of 2000 MHz, a level of -10 dBm, a mod-
ulation frequency of 3 kHz and a frequency deviation of 75 kHz.
Use appropriate parameter values when making the measurements in the ex-
ample shown below.
CAUTION:
The maximum amount of power that can be input to the analyzer is +30 dBm (1 W). When directly
measuring an FM transmitter output, connect an external attenuator so the power cannot exceed
+30 dBm (1W).
Setup
1.
Connect the unit under test as shown in Figure 2-135.
Figure 2-135 Setup for Measuring FM Signal
Power on
2.
Turn the analyzer and the unit under test power on.
Setting the unit under test
3.
Activate the signal output for the unit under test.
Initialization
This resets the current settings to the factory defaults or user-defined presets.
4.
Press SHIFT and CONFIG(PRESET).
This sets the analyzer to its presets values.
Setting the measurement conditions
This changes the analyzer settings so that the input signal is displayed more clearly.
5.
Press FREQ, 2 and GHz.
A center frequency of 2 GHz is set.
