276 Keysight N9927-90001 User’s Guide
Over–the–Air Measurements (OTA) – LTE FDD Option 370 and 5GTF Option 377 (CPU2
Only)
How to Set Up Over–the–Air (OTA) Mode Settings
10. Modify RF attenuator, Preamp, and other settings:
Press Scale/Amptd
> More
Then press the following:
— RF Atten
to set the attenuator power (default: –10 dB). Set to 0 dB.
— Preamp
change to ON.
— Range
to set the absolute power (dBm)
— Others (optional): External Gain
11. Optional: Modify scale and specify color bar limit values—Modify the scale
and assign colors to low and high power channels (bars):
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.
12. Optional (i.e., If the Scan Results table does not populate): Press Meas
Setup
— LTE FDD:
— Then FreqError Th
> 5 kHz (enables data with larger
frequency error to be displayed)
or Extend Freq Lock > ON (disables FreqError Th softkey
and displays all available cell results. (This may result in
longer scan times, because display does not update until
all potential cells and their frequency offsets are detected
between signal and the OTA center frequency.)
— 5GTF: Then SyncCorr Th > 0% (enables data with greater than 0% of
the specified Sync Correlation percentage to be displayed)
— Once the table populates, enter the desired frequency error (LTE
FDD) or Sync Correlation (5GTF) threshold for your measurement
(LTE FDD: Default = 900 Hz, i.e., if a carrier signal’s error is greater
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