User guide

How to Execute the Eye Opening Measurement
To run the Eye Opening measurement:
1
Switch to the Analysis panel and then press the Eye Opening icon.
2
Press the Start button to execute the measurement.
The measurement is run and the display is continually updated. The following
illustration shows the eye diagram of the measured bit error rate and-in the tabular
view-the calculated results for the Time Eye Opening, the Threshold Eye
Opening, the Optimal Sample Delay and the Optimal Sample Threshold.
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
These settings are used while the measurement is running. Changes require
to run the test again. See “Parameters Tab” on page 295 for details.
– Pass/Fail tab
These settings determine whether the calculated results are recognized as
passed or failed. However, a new test run is not required when doing
changes here. See “Pass/Fail Tab” on page 296 for details.
Advanced Analysis 6
Agilent J-BERT N4903B High-Performance Serial BERT 291