User guide

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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 at the top of the user interface should show red and the resulting
BER should be zero.
How to Execute the DUT Output Timing/Jitter Measurement
To run the DUT Output Timing/Jitter measurement:
1
Switch to the Analysis area. If the Output Timing screen is not yet displayed,
press the Output Timing icon.
2
Press the Start button to execute the measurement.
The measurement software runs the measurement and displays the results. The
following illustration shows the bathtub curve of the measured bit error rate and-
in the tabular view-the calculated results for the Optimal Sampling Delay, the
Skew and the Phase Margin.
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
Advanced Analysis 6
Agilent J-BERT N4903B High-Performance Serial BERT 251