JDS Uniphase CellAdvisor JD780A Series, Руководство пользователя

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JD780A Series Analyzers
Using Interference Analyzer
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3.
Toggle the Interference ID soft key between On and Off to turn the Interference ID on and off.
4.
To set the threshold level manually, complete the following steps:
a. Press the Threshold soft key.
b. Enter a value by using the numeric keys.
c. Press the dBm soft key.
5.
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.
NOTE
You can use the LIMIT hot key to analyze your measurements with the display line, multi-
segment line, and channel limit. See
“Setting limit for interference analyzer” on page 119
for more information.
Conducting interference measurements
Spectrogram
The Spectrogram is particularly useful when attempting to identify periodic or intermittent signals as it
captures spectrum activity over time and uses various colors to differentiate spectrum power levels.
When the directional antenna is used to receive the signal, you will see a change in the amplitude of
the tracked signal as you change the direction of the antenna and see a change in the Spectrogram
colors. The source of the signal is located in the direction that results in the highest signal strength.
Setting measure setup
Procedure
1.
Configure test parameters as described in the
“Configuring test parameters” on page 95.
2.
Press the MEASURE SETUP hot key.
3.
To set the amount of time between each trace measurement:
a. Press the Time Interval soft key.
b. Enter a value by using the numeric keys. You can also use the rotary knob.
c. Press the Sec soft key.
4.
To set the time cursor on a specific trace position, complete the following steps:
a. Toggle the Time Cursor soft key and select On .
b. Turn the rotary knob to move the time cursor. You can also enter a value and then press the
Enter soft key.
NOTE
Enabling the time cursor puts the measurement on hold and you can make post-
processing analysis for each measurement over time using the time cursor.
5.
To start a new measurement, press the Reset/Restart soft key.
6.
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.
Measurement example
The spectrogram shows a vertical line on the chart when the marker is enabled on the screen.