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Percent
Amplitude
Modulation
Measurement
Percent amplitude modulation can be measured quickly and easily using
the one-button % AM function. The signal and both its sidebands must be
on the display. The sidebands are assumed to be entirely from amplitude
modulation. The spectrum analyzer places arrow markers on the three signals
to be used to compute percent amplitude modulation, and displays the value.
If the sidebands are not in the frequency span or their frequency spacing is
not equal, the measurement stops and an error message is displayed.
Percent AM measurement accuracy for close signals:
l typically about
f0.
1
%/%
, for log mode
l typically about
*3
% , for linear mode
b
MKR
400.0000
MHZ
IEF
48.8
dBm
DEAK
-00
10
3B/
I”
AT
20
dB
35
87
dBmV
8
.53
/
WA
se
SC
FC
\
I/
I
\I
/
I
CORA
dB
PTS
ON
OFF
-
%
AM
OJ
OFF
TO1
ON
OFF
CENTER
400.0000
MHz
SPAN
271.4
kHz
#RES
BW
10
kHZ
“BW
10 kHZ
SWP
30.0
nl5ec
Figure
5-33.
Percent Amplitude Modulation Measurement
5-62