JDS Uniphase CellAdvisor JD780A Series, User Manual

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JD780A Series Analyzers
Using Spectrum Analyzer
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To display the multiple segment line:
1.
Press the LIMIT hot key.
2.
Press the Multi Segment Line soft key for Pass/Fail indication.
3.
Toggle the Limit soft key between Upper and Lower to select the one to be displayed.
4.
Set the number of segments for the selected upper or lower limit line. You can set up to 50
segments.
a. Press the # of Line soft key.
b. Enter a value between 1 and 50 by using the numeric keys.
c. Press the Enter soft key.
5.
Press the Autoset soft key to let the instrument set the limit for each segment and display the
line.
6.
Optional . To move the limit line, complete the following steps:
a. Select Limit Up/Down or Limit Left/Right .
b. Turn the rotary knob to move the line as desired. You can also manually enter a value.
7.
Optional . To edit the segment properties, complete the following steps:
a. Press the Edit Limit soft key.
b. Press the Move soft key and then turn the rotary knob to select the segment to edit.
c. Select the menu option, from the following choices:
–
To hide the line for the selected segment, toggle the Line soft key and select Off .
–
To add a new point, press the Add Point soft key.
–
To delete the selected point, press the Delete Point soft key.
–
To change the position, press the Frequency or Amplitude soft key, and then turn the
rotary knob to change the value as desired.
8.
Optional . Go to SAVE/LOAD > Save , and then select Limit to save the limit settings.
See
“Using save” on page 31 for more information.
Conducting RF measurements
Channel power
The Channel Power measurement is a common test used in the wireless industry to measure the total
transmitted power of a radio within a defined frequency channel. It acquires a number of points
representing the input signal in the time domain, transforms this information into the frequency domain
using Fast Fourier Transform (FFT), and then calculates the channel power. The effective resolution
bandwidth of the frequency domain trace is proportional to the number of points acquired for the FFT.
The channel power measurement identifies the total RF power, power spectral density, and Peak to
Average Ratio (PAR) of the signal within the channel bandwidth.
Setting measure setup
After configuring test parameters, you can set the measure setup to continue your measurement. The
measurement settings can be saved and recalled as a file. You can also use JDViewer, PC application
software to configure a measure setup, save as a file, and load the file on to the instrument.