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Modulation Analyzer
7 -9
The HP 8902A offers complete modulation analyzer capability to
meet your AM, FM and +M measurement needs. Even difficult
measurements
such
as signal-to-noise and incidental AM and FM
can be made with ease and superb accuracy using the HP 8902A.
Set up your HP 8902A, Sensor Module, and signal generator as shown
in Diagram 1-1.
Adjust Your Signal Generator
RF Frequency
....................
100 MHz
Depth
...........................
.50%
Amplitude
.......................
0.0 dBm
Modulation
......................
AM
Rate
.............................
1 kHz
Measuring AM
1.
Press the
AM
key, the green
AUTOMATIC OPERATION
key, and the
. . . . . . . . . . . . . . . .
2.
PEAK+
detector-key. The instrument should display an AM index of
approximately 50%. Notice that the instrument is in the Auto Tuning
mode (green AUTO TUNING LED on). The HP 8902A automatically
found and tuned to the modulated RF signal. (The Auto Tuning mode is
a good choice for making most modulation and audio measurements.)
Key in 100 MHz by pressing the digit keys 1 0 0 and the
MHz
key. The instrument is now manually tuned to the frequency of the
input signal (green LED o f f ) . (Manual Tuning is a good choice when
measuring modulation in the presence of multiple RF input signals.)
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