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Making Measurements Using Spectrum Analyzer Mode
Measuring Amplitude Modulation with the Fast Fourier Transform Function
‘&
REF
424.2
m”
AT
20
dB
MARKER
SMPL
NORM*L
LIN
%
AM
4c.37
?6
MARKER
b
c
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-
i7
MARKER
AMPTD
SELECT
12
3
4
sn
VB
SC
FC
MARKER
1
CORR
r’h’
qFF
YJ”
y
More
1
Of
2
FFT
START
0
HZ
FFT
STOP
250
HZ
#RFS
RW
30 kHZ
“BW
30 ktlZ
“SWP
800
m5ec
Figure 5-2. Percent Amplitude Modulation Measurement
Example 2: Use the automatic FFT measurement to look at 60 Hz AM
modulation.
1. Connect a signal generator to the spectrum analyzer’s INPUT 75
62.
Adjust
the signal generator to produce an AM signal with a 60 Hz modulation
‘frequency.
2. Press [FREQUENCY) and set the spectrum analyzer center frequency to the
frequency of the modulated input signal. Press (SPAN), 10
IhllHz).
Press
[FREQUENCY) to keep the signal on the spectrum analyzer display.
2.
Press
k-1,
FFT Menu,
and MARKER+ AUTO FFT . This initiates
the FFT function and activates a marker.
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