Model
8901B
Operation
LOCAL
(keystrokes)
(program
codes)
2.
Disable auto-ranging by pressing the RANGE
HOLD
key:
RANGE
HOLD
El
4
Range
Hold
LOCAL
(keystrokes)
a
(program
codes)
3.
On the RF signal source, swith the AM
off.
Measure the residual AM,
Npk,
on the CW
signal.
For the purposes
of
subsequent calculations, assume
0.07%
is
read on the Modulation Analyzer’s
display.
4.
Measure the average residual modulation:
DETECTOR
r-RmsCAL
1
e
7
Detector
For the purposes
of
subsequent calculations, assume the displayed average residual AM
is
0.02%.
5.
Compute:
6.
Compute:
(s
-k
N)pk
-
30.80%
NPk
0.07%
-
440
7.
Use the nomograph to
find
N%.
(For the purposes
of
these calculations, assume
N%
is
26%)
Compute:
Spk
=
(S
+
N)pk
-
(Npk)(N%)
=
30.80%
-
(0.07%)(0.26)
=
30.78%.
NOTE
This correction factor
of
<0.1%
of
the peak reading
is
typical
of
a
modulation measurement
of
a quality modulation source measured with the
15
kHz
low-pass filter.
Residual Noise Effects
3-193
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