Resolving Small Signals Hidden By Large Signals - Keysight X Series Measurement Manual

Resolving Small Signals Hidden by Large Signals

This procedure uses narrow resolution bandwidths to resolve two input signals with
a frequency separation of 50 kHz and an amplitude difference of 60 dB.
Step
1 Connect two sources to the
analyzer RF INPUT as
shown.
2 Set up the signal sources.
3 Select the mode
4 Preset the analyzer:
5 Set up the analyzer to view
the signals.
Action
a. Set the frequency of signal
generator #1 to 300 MHz.
b. Set the frequency of the signal
generator #2 to 300.05 MHz.
c. Set signal generator #1 amplitude to
−10 dBm.
d. Set signal generator #2 amplitude to
−54 dBm.
• Press Mode, Spectrum Analyzer.
• Press Mode Preset.
a. Press FREQ Channel, Center
Freq, 300, MHz.
b. Press BW, Res BW, 30, kHz.
c. Press SPAN X Scale, Span, 500,
kHz.
33
Measuring Multiple Signals
Resolving Small Signals Hidden by Large Signals
Notes
This signal is 50 kHz higher in
frequency than the first signal.
The −54 dBm setting plus
−16 dB coupling factor of the
86205A results in a signal 60
dB below the first signal.