Keysight Technologies C Series - Page 371

Keysight N9915-90020 User’s Guide 371
Over–the–Air Measurements (OTA) – LTE FDD Option 370, LTE TDD Option 371, 5G TF
Option 377, 5G NR / 5G NR EVM Conducted Option 378
How to Set Up Over–the–Air (OTA) Mode Settings
— Press Auto-Range Executes an auto-range, which determines
the optimal RF attenuation and preamp settings for the
current input signal.
Executing an auto-range does NOT change any of the display
settings (i.e., Ref Level, Scale or Ref Pos).
See also,
“About the Auto-Range Feature” on page 412.
— Press
External Gain
b. Optional (When Display Type = Bar Chart): Modify scale and specify
color bar limit values—Modify the bar chart display color coding
scheme for the power channels (bars):
Press Trace > More > Bar Color Coding
Then one of the following:
—
CC to set the CC (Component Carrier) associated with each
bar.
— PCI to set the PCI (Physical Cell Identifier) associated with
each bar.
— Level to set the level of the value associated with each bar.
When level is selected, you can set the channels’ red and blue
power level limits with the Scale/Amptd softkeys:
Press
Scale/Amptd
Then one of the following:
— Red Limit to set the power level and color scale for high
power channels.
— Blue Limit to set the power level and color scale for low
power channels.
— Others: Scale, Ref Level, etcetera as desired.
—
More opens a menu of softkeys that are the same as those
that are defined when the Display Type = Table.
— Others (optional): Autoscale
c. Optional (When Display Type = Spectrum): Modify RF attenuator,
Preamp, and other settings:
Press Scale/Amptd
Then press the following:
—
Ref Pos Manually set the position of the reference line. Values
must be between 0 (TOP line) and 10 (BOTTOM line).
—
Scale Manually enter a scale per division to view specific
areas of the trace.