Operation Model
8901B
100
A
n
z
v)
+
80
-
5
0
a
W
O
60
a
a
L
=)
40
Y
I-
u
v)
W
m
0
I-
z
0
s
Y
20
Y
n
1
10
1000
10
000
Nomograph for Calculating Percentage of
Npk
to be Subtracted
from
(s
+
N)pk
to obtain
Spk
(Sinewave Modulation Only)
EXAMPLE
An
RF signal
is
applied
to
the Modulation Analyzer. The modulation rate
is
1
kHz
and the peak
modulation
is
to
be measured in
a
15
kHz
post-detection bandwidth. To measure the peak
AM
depth
and correct for the effects of residual noise on the modulation:
1.
Measure the peak modulation depth,
(S
+
N)pk:
LOCAL
(keystrokes)
$@
(program
codes)
AU
M1
D112
Measurement
LTL
Filter
Detector
~
~~ ~
For the purposes
of
subsequent calculations, assume the displayed
AM
is
30.80%.
3-192
Residual Noise Effects
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