Keysight Technologies FieldFox A Series, Руководство пользователя

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Keysight N9927-90001 User’s Guide 307
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
Repeat process as needed for additional Windows, Data, and CC settings.
5. Optional: Press Sweep 3 and modify/select items:
— Single
— Continuous OFF ON to ON (default)
— Restart
— Strip Points
6. Press Trigger Settings
— Freerun (default) or
— External sets a sweep to trigger on an external TTL signal at the
External Trigger connector. External trigger is available only after
initial setting.
— Periodic sets a trigger that repeats at the period rate entered.
Periodic trigger's phase can be altered by the Offset value.
7. Optional: Press Meas Setup 4 – Only required if scan does not display
data.
— LTE FDD : Press FreqError Th and change to 5 kHz – Wait a few
seconds until Table populates or set FreqLock Range to Extended .
— Then change back to the desired Frequency Error
Threshold for your measurement.
— 5GTF : Press SyncCorr Th and change to 0% – wait a few seconds
until the Table populates and
— Then change back to the desired Sync Correlation
Threshold for your measurement.
8. Press Trace 6
— And, set up your Windows and component carriers (CCs) as
indicated in “How to Set Up Over–the–Air (OTA) Mode Settings” on
page 294 .
9. Press System
— Press GNSS > GNSS Receiver > Internal > Esc
IMPORTANT! When you select a multiple CCs (e.g., CC0, CC1, etcetera)
and record data, you may actually see other cell signals that do not have
sufficient power to be displayed, but are still detectable. When you select
ALL, multiple component carriers are selected, but the results of the
component carrier (CC) with the highest power is displayed. Refer to
Figure 12-7 on page 300 .