User`s guide

42 N9320A Spectrum Analyzer
3 Functions and Measurements
Figure 12 Decreasing Resolution Bandwidth
A “#” mark appears next to the Res BW annotation in the
lower left corner of the screen, indicating that the resolution
bandwidth is uncoupled.
Uncoupled indicates that the function is in manual control
mode, not auto control mode. Manual control mode allows
the user to change the parameter value for that function
without affecting any other settings.
Trace Averaging
Averaging is a digital process in which each sweep of the
trace returns measurement values for each point in the
trace. These values are then mathematically averaged with
the previous sweep trace data which has been stored in the
analyzer. The amount of averaging is selected by choosing
the number of trace sweeps to be included in the process.
The averaging function uses the most recent trace sweep
values so that the display shows any signal changes.
NOTE
The analyzer allows you to change the RBW in a 1-3-10 sequence by
the data control keys. The RBWs below 1 kHz are digital and have a
selectivity ratio of 5:1 while RBWs at 1 kHz and higher have a 15:1
selectivity ratio. The maximum RBW is 3 MHz and minimum is 10 Hz.