Keysight Technologies N9321C User Manual page 102

Functions and Measurements
Measuring Channel Power
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4 Press Center Freq to change the center frequency of the current
signal channel. Adjust the center frequency to measure other
channel power in the same standard.
Please follow the similar procedure as above to measure the
channel power in the CDMA and LTE standard.
To measure the channel power in GSM standard, the default
setting is 10 MHz span, 300 kHz RBW, and the continuous peak
search is enabled. The instrument will measure the channel power
after the center frequency is changed.