HP 8901B Operation And Calibration Manual page 77

Modulation Analyzer
1-13
RF Carrier Frequency
150 kHz to 9.999999 MHz
10 MHz to 1300 MHz
Measuring oM
1.
Turn off the FM on the signal generator and select
10
radians phase
modulation at the rate of
1
kHz.
(If your signal generator does not have
(PM capability, set modulation to FM, 10 kHz deviation at a 1
kHz
rate.)
Modulation Rates
200 Hz to 10 kHz
200
Hz to 20 kHz
/n Radians 2.
Press the
(PM
key, the green
AUTOMATIC OPERATION
key, and
the
PEAK+
detector key. The
HP
8901B should display a reading
of about 10 radians. Notice that the yellow OM MODULATION
OUTPUT LED is now lit to indicate that the demodulated (PM signal
is available at the MODULATION OUTPUT/AUDIO INPUT port.
(An
audio measurement device, such as an oscilloscope, can be
connected to this port for monitoring the demodulated audio signal.)
In Degrees 3.
Key in 1.745 and then press the
RATIO key. The HP 8901B is
now displaying the phase deviation in degrees. (If the display is
reading in dB, press the LOG/LIN key to get
YO.
The instrument
should display approximately 570 degrees for 10 radians of (PM.)
(PM Measurement
Ranges
Select the @M measurement mode to simplify your phase modulation
measurements throughout the following ranges:
Maximum Deviation
I
400
100
10 MHz
5
fc
5
1300 MHz
4 I
I
.1
. 4 u - l
1 0 0 200
400
l k
2k
4 k 1Ok
:
MODULATION RATE (Hr)