JDS Uniphase CellAdvisor JD780A Series, Руководство пользователя

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JD780A Series Analyzers
104
Using Interference Analyzer
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To set the limit as the alarm reference, complete the following steps:
a. Toggle the Alarm Reference soft key and select Line .
The Limit Line menu becomes activated to be set.
b. Press the Limit Line soft key to define a threshold for the limit line.
c. Enter a value by using the numeric keys. You can also use the rotary knob.
d. Press the dBm soft key.
6.
Optional . To adjust the volume for alarm sound, press the Volume soft key and then turn the
rotary knob clockwise or counter clockwise.
7.
Optional . You can save logging data automatically so that you can load the measurement data
and replay in the Spectrum Replayer mode. See
“Using save” on page 31 for more information.
AM/FM audio demodulation
You can use the AM/FM Audio Demodulation to identify if the interfering signal is n
th
harmonics of
AM/FM audio. The instrument sounds demodulated signals that you can hear through the speaker or
headphones.
Procedure
1.
Configure test parameters as described in the
“Configuring test parameters” on page 95.
2.
Press the MEASURE SETUP hot key.
3.
Toggle the Audio Demod soft key between On and Off to turn the AM/FM audio demodulation
on and off.
4.
Press the Demod at soft key, and then select the marker number for the frequency to be
demodulated.
NOTE
You must set the marker(s) first by using the MARKER hard key as the AM/FM
demodulator uses the marker position to demodulate. See
“Using marker” on page 54 for
more information.
5.
Press the Demod Mode soft key, and then select the demodulation mode: AM , FM and CW .
6.
Press the Dwell Time soft key, and then turn the rotary knob to set the demodulation interval
between 1 and 20.
7.
Press the Volume soft key, and then turn the rotary knob to set the speaker volume.
8.
Toggle the Auto Gain soft key between On and Off to enable or disable the automatic gain
feature to adjust the interval gain of the demodulator.
9.
Optional . Go to SAVE/LOAD > Save , and then select the save option from the choices available
for your measurement mode. See
“Using save” on page 31 for more information.
Interference ID
The Interference ID automatically classifies interfering signals over a designated spectrum and
displays the list of possible signal types corresponding to the selected signal.
Procedure
1.
Configure test parameters as described in the
“Configuring test parameters” on page 95.
2.
Press the MEASURE SETUP hot key.