Keysight Technologies C Series - Troubleshooting

416 Keysight N9915-90020 User’s Guide
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
Troubleshooting
Troubleshooting
If your OTA setup is not behaving as expected:
— Verify setup is correct by referring to “How to Set Up Over–the–Air (OTA)
Mode Settings” on page 365
.
— Attenuator set to 0 dB
— Preamplifier set to ON
—Correct Band, Channel, and Center Frequency entered
— GNSS set to Internal
—Frequency Ref set to GPS
— For LTE FDD and LTE TDD: Verify that the Frequency Error Threshold
(dB)—(FreqError Th) value is large enough or not too large
— For LTE FDD and LTE TDD: Verify that the Extend Freq Lock value is
enabled and then adjust settings to improve your measurement
— . For 5G TF: Check that the Frequency Correction Threshold value
(%)— (Sync Corr Th %) is small enough or not too large.
— ADC errors: Use Scale/Amptd
> Range to adjust the absolute power
level (dBm).
For some data views, you need to press More to view the Range
softkey.
— No data displayed: Press Meas Setup 4 – Only required if scan does
not display data.
——LTE FDD and LTE TDD: 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.
——5G TF: 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.