JDS Uniphase CellAdvisor JD780A Series, User Manual

Page: 374 / 592

JD780A Series Analyzers
374
Using EV-DO Signal Analyzer
2.
Toggle the Unit soft key and select Channel .
3.
To select the standard channel, complete the following steps:
a. Press the Channel Std soft key. The standard channel window appears.
See
“Appendix C – Band, frequency & channel standard” on page 571 for more information.
b. Select the band to be measured by using the rotary knob, the arrow keys, or the Page
Up/Page Down soft keys.
c. Press the Select soft key or the rotary knob to confirm the selection.
4.
Press the Channel Number soft key.
5.
Enter a value by using the numeric keys. You can also use the rotary knob.
6.
Press the Enter soft key.
The instrument automatically displays the corresponding center frequency value for the selected
channel number.
7.
Optional . To define the amount of channel increment for the rotary knob, complete the following
steps:
a. Press the Channel Step soft key.
b. Enter a value by using the numeric keys. You can also use the rotary knob.
c. Press the Enter soft key.
NOTE
This frequency setting is not used in the Multi-ACLR and Spurious Emissions modes.
Setting amplitude
Reference level and attenuation
You can set the reference and attenuation levels automatically or manually to optimize the display of
the traces measured, as you desire.
Procedure
To automatically set the reference and attenuation level:
1.
Press the AMP/SCALE hard key.
2.
Press the Auto Scale soft key.
Each time you press this key, both of the Y-axis scale and input attenuation level change to be
optimized with some margin.
To set the reference or attenuation level manually:
1.
Press the AMP/SCALE hard key.
2.
To set the maximum reference value on the Y-axis manually, complete the following steps:
a. Press the Reference Level soft key.
b. Enter a value by using the numeric keys or the rotary knob with 10 dB increments.
c. Press the unit soft key or the ENTER hard key.
NOTE
In the measurements such as Code Domain Power and MAC Codogram , you may
need to select the reference option between Relative and Absolute before setting the
reference level.
3.
To set the attenuation option, select one from the following choices:
–
To set the input attenuator
’s level automatically, select
Attenuation > Auto .