Keysight Technologies N9321C, User Manual

Page: 55 / 220

47
Functions and Measurements
Measuring a Low-Level Signal
Figure 3-12Decreasing 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
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.