Keysight Technologies N9322C User Manual page 58

Functions and Measurements
Improving Frequency Resolution and Accuracy
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The marker readout in the active frequency function changes
while the counted frequency result (upper- right corner of
display) does not. For an accurate count, the marker need
not be placed at the exact peak of the signal response.
The Frequency counter properly functions only on stable, CW signals
or discrete spectral components. The marker power level must be
greater than 40 dB above the displayed noise level.
6
To turn off the marker counter:
Press Marker > Function > Off.
When using the frequency counter function, the ratio of the resolution
bandwidth to the span must be greater than 0.02.