Chapter 2 83
Making Measurements
Example 6: AM and FM Demodulation
a. Press AUX CTRL AM/FM DEMOD to access the demodulation menu.
b. Activate a marker by pressing
MARKER NORMAL.
c. Position the marker on the signal of interest. If the signal of
interest is the highest in amplitude, press PEAK SEARCH directly,
as in Figure 2-28 on page 83.
Figure 2-28 Place a marker on the signal of interest, then demodulate.
Set the time
4. For this example, before demodulating the signal, set the
demodulation time to 30 seconds:
a. pressing
MORE 1 OF 2, DEMOD TIME.
b. Enter 30 seconds. This sets the actual time that the built-in
demodulator will demodulate the signals so you may listen to it.
Demodulate the signal
5. Press
MORE 2 OF 2, then set FM DEMOD ON OFF to ON. You may have
to adjust the volume of the speaker using the volume knob located on
the front panel, under the display.
NOTE You also can use AM or FM demodulation when the frequency span of
the spectrum analyzer is zero. To obtain continuous demodulation in
zero span, set the trigger mode to external by pressing
TRIG,
EXTERNAL. Setting the spectrum analyzer to the external trigger mode
(without actually supplying a trigger) gives you an uninterrupted
signal. Otherwise, demodulation will occur only during the spectrum
analyzer sweep.
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