Keysight Technologies N9321C User Manual page 45

Functions and Measurements
Measuring Multiple Signals
Figure 3-3
shows the reference annotation for the delta marker
(1R) at the left side of the display, indicating that the marker set at
the 50 MHz reference signal is at a lower frequency than the
frequency range currently displayed.
Figure 3-3 Delta Marker with Reference Signal Off-Screen
The delta marker appears on the peak of the 100 MHz component.
The delta marker annotation displays the amplitude and frequency
difference between the 50 and 100 MHz signal peaks.
Press Marker > Mode > Off to turn the markers off.
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