Technical data

Chapter 5 83
Spectrum Analyzer
Measuring Multiple Signals
Spectrum Analyzer
Figure 5-8 Unresolved Signals of Equal Amplitude
Step 4. Change the resolution bandwidth (RBW) to 100 kHz so that the RBW
setting is less than or equal to the frequency separation of the two
signals:
Press
BW, Res BW (Manual), 100, kHz.
Notice that the peak of the signal has become flattened indicating that
two signals may be present.
Figure 5-9 Resolving Signals of Equal Amplitude
As the resolution bandwidth is decreased, resolution of the individual
signals is improved and the sweep time is increased. For fastest
measurement times, use the widest possible resolution bandwidth.
Under factory preset conditions, the resolution bandwidth is “coupled”
(or linked) to the span.
Since the resolution bandwidth has been changed from the coupled
value, a # mark appears next to Res BW in the lower-left corner of the
screen, indicating that the resolution bandwidth is uncoupled. (For
more information on resolution bandwidth, refer to the
Res BW