Keysight M9383B Measurement Manual page 84

5G New Radio (NR) Measurements using X-Apps
5G Waveform, EVM, and ACP Analysis Using X-Applications
4. In the Signal Studio setup, select the Waveform tab and observe the
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Phase Compensation and Radio Frequency settings.
Phase Compensation is applied by default at baseband for RF
up-conversion. This means, it depends on the carrier frequency, so
waveform generation is per the carrier frequency. Unlike conventional
Signal Studio waveforms, which are independent from carrier frequency.
Phase Compensation is set to Auto by default. The frequency is coupled
with the VXG frequency setting. You can select Manual to specify a
different frequency, or turn it off.
M9383B/84B Measurement Guide