User guide

9
Press Sync Now and then Auto Align to find the optimum sampling point. Check
that the synchronization and the alignment were successful. None of the error
indicators should show red, and the resulting BER should be zero.
How to Execute the Spectral Jitter Measurement
To run the Spectral Jitter measurement:
1
Switch to the Analysis area. If the Spectral Jitter screen is not yet displayed,
press the Spectral Jitter icon.
2
Press the Start button to execute the measurement.
The measurement software runs the measurement and displays the results. A total
of 65535 points are displayed for this measurement.
Numerical values are also displayed. The values include Bit Error Rate, Total
Power, and Noise power. Additionally, you can also configure up to 16 frequency/
power pairs. The latter are sorted according to descending power contents. These
results are discussed in “Explanation of the Numerical Results” on page 259.
How to Optimize the View of the Results
After you have run a measurement, the resulting graph and the calculated
numerical values are displayed. To improve the results, you can change the
measurement parameters:
1
Press the Properties button to open the Properties dialog box.
2
Use the different tabs in this dialog box to make the required settings:
– Parameters tab
6 Advanced Analysis
352 Agilent J-BERT N4903B High-Performance Serial BERT