Agilent Technologies Signal Analyzer N9030a - Manual (Page 466)

5 Legacy Command Descriptions
SP (Frequency Span)
Couplings If resolution and video bandwidths are coupled to the span width, the bandwidths change
with the span width to provide a predetermined level of resolution and noise averaging.
Likewise, the sweep time changes to maintain a calibrated display, if coupled.
All of these functions are normally coupled, unless "RB (Resolution Bandwidth)" on page
442 , "VB (Video Bandwidth)" on page 501 , or "ST (Sweep Time)" on page 470 have been
executed.
466 Remote Language Compatibility Measurement Application Reference