Agilent Technologies 8935 Series, Руководство пользователя

Страница: 217 / 343

216 Chapter 8
Performance Tests
RF Analyzer FM Bandwidth Performance Test 22
b. Set the output frequency to 1 kHz.
4. On the Test Set:
a. Press
Preset
.
b. Select the INSTRUMENT CONFIGURE screen.
c. Set the
RF Display
field to
Freq
.
d. Select the CDMA GENERATOR screen.
e. Set the
CW RF Path
field to
Bypass
.
f. Select the RF ANALYZER screen.
g. Set the
Tune Freq
to
400 MHz
.
h. Set the
Input Port
field to
Ant
.
i. Set the
IF Filter
field to
230 kHz
.
j. Set the
Squelch
field to
Open
.
k. Select the AF ANALYZER screen.
l. Set the
AF Anl In
field to
FM Demod
.
m. Set the
Filter 2
field to
>99kHz LP
.
n. Set the
Detector
field to
Pk+
.
5. Set the audio analyzer to the following frequencies: 20 Hz, 100 Hz, 1
kHz, 10 kHz, 35 kHz, and 70 kHz. For each frequency adjust the
audio analyzer’s level until the measuring receiver reads 25 kHz FM
deviation and record the deviation read on the Test Set.
6. Of the FM deviations measured by the Test Set find the maximum
and minimum deviations and make the following calculation:
Equation 8-2
Record the dB difference in the Performance Test Record and
compare it with the limits shown.
dB 20
Maximum Deviation
Minimum Deviation
--------------------------------------------------
 
 
log
•
=