Trying Out the Instrument
R&S
®
FSPN
50
Getting Started 1179.4370.02 ─ 01
How to smooth the trace by adjusting the number of XCORR operations
When you apply cross-correlation operations, the application is able to determine
the phase noise characteristics at a certain frequency offset more precisely.
The number of cross-correlation operations applied in each half decade depends
on a cross-correlation factor that you can define arbitrarily.
Cross-correlation operations are applied to all traces.
1. Enter the "Overview" dialog box, and from there, enter the "Noise Config" dia-
log box.
2. Define the cross-correlation factor as required in the "XCORR Factor" input
field.
The application calculates the number of cross-correlations for each half dec-
ade based on this factor. You can see the resulting operations in the table of
the "Noise Config" dialog box.
The number of operations calculated for each half decade targets a similar
measurement time for all half decades, so that the measurement is done at
roughly the same time in each half decade.
You can also see the resulting number of operations in the green bar at the
bottom of the diagram area.
For more information on how cross-correlation works refer to the R&S
FSPN
user manual.
How to smooth the trace graphically
When you apply trace smoothing, the existing data remains the same. The trace
is smoothed by applying mathematical operations
Trace smoothing is applied to each trace individually.
1. Enter the "Overview" dialog box, and from there, enter the "Analysis" dialog
box.
2. Select the vertical "Trace" tab, and then the horizontal "Traces" tab.
3. For any trace, turn on "Smoothing" and define the amount by which the trace
should be smoothed (in %) in the corresponding input field.
Result Evaluation
