Agilent Technologies N9340A - Manual (Page 50)

4 Making Measurements
48 N9340A User’s Guide
Resolving Small Signals
Hidden by Large Signals
This example uses narrow resolution bandwidths to
resolve two input signals with a frequency
separation of 50 kHz and an amplitude difference
of 60 dB.
1 Connect two sources to the analyzer input
connector as shown in Figure 3 on page 46.
2 Set one source to 300 MHz at –10 dBm. Set the
other source to 300.05 MHz at –70 dBm.
3 Set the analyzer as follows:
•
Press
[PRESET]
•
Press
[FREQ] > {Center Freq} > 300 > {MHz}
•
Press
[BW/SWP] > {RBW} > 30 > {kHz}
•
Press
[SPAN] > [500] > kHz.
If the signal peak is not present on the display,
span out to 20 MHz, set the first marker frequency
to center frequency, span back to 2 MHz.
• Press
[SPAN] > 20 > {MHz}
•
Press
[MARKER] > {Peak Search}
•
Press
[MARKER] > {Marker To} > {To Center}
•
Press
[SPAN] > 2 > {MHz}
4 Set the 300 MHz signal to the reference level:
•
Press
[MARKER] > {Peak Search}
•
Press
[MARKER] > {Peak Search} > {To Ref}
5 Reduce the resolution bandwidth filter to view
the smaller hidden signal. Place a delta marker
on the smaller signal:
•
Press
[BW/SWP] > {RBW} > 1 > {kHz}
•
Press
[MARKER] > {Peak Search}
•
Press
[MARKER] > {Delta}
•
Press
[BW/SWP] > {RBW} > 50 > {kHz}