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Keysight Handheld Analyzers
N99xxA User’s Guide
10 RTSA (Real-Time Spectrum Analyzer) Mode—Option 
350 (CPU2 Only)
RTSA Mode measures signals at the SA RF IN connector. 
For a comprehensive RTSA mode tutorial, see Understanding and Applying 
Probability of Intercept in Real-Time Spectrum Analysis (App Note) at 
http://literature.cdn.keysight.com/litweb/pdf/5991-4317EN.pdf
Figure 10-1 RTSA Display using Markers
The graphic above shows an RTSA display of a Bluetooth signal using 
markers.