Technical data

86 Chapter 5
Spectrum Analyzer
Measuring Multiple Signals
Spectrum Analyzer
Figure 5-11 Signal Resolution with a 100 kHz RBW
Step 5. Activate averaging to smooth the noise:
Press
Meas Setup, Average Mode, Exponential.
Press
Avg Number, 25, Enter.
Press
Trace/Detector, Average
Step 6.
Reduce the resolution bandwidth filter to view the smaller hidden
signal. Place a delta marker on the smaller signal:
Press
BW, 30, kHz.
Press
Peak Search, Marker, Delta, 450, kHz.
Note that the Agilent CSA 30 kHz filter shape factor of 8:4 has a
bandwidth of 252 kHz at the 60 dB point, however noise sidebands will
make the 60 dB bandwidth appear wider. The half-bandwidth
(including effects of noise sidebands) is narrower than 250 kHz, so the
input signals can be resolved.
Figure 5-12 Signal Resolution with a 30 kHz RBW