User guide

N O T E
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For more details refer to “Eye Diagram - Reference” on page 332
Eye Diagram - Procedures
This section lists out some of the generic processes to set up measurements, to
run them, and to create Eye Diagrams.
In this section, you will learn about:
• “How to Prepare the Eye Diagram Measurement?” on page 320
• “How to Initiate an Eye Diagram Measurement?” on page 321
• “How to Change the Default Settings of an Eye Diagram?” on page 322
• “How to Set Markers?” on page 325
• “How to Run the Mask Measurement?” on page 326
• “How to Customize Mask Files” on page 327
• “How to Enter Notes?” on page 329
• “How to Save and Recall” on page 329
• “How to Export Fetched Data?” on page 330
How to Prepare the Eye Diagram Measurement?
An example to prepare an Eye Diagram measurement:
1
Disable the pattern generator outputs by pressing the 0V (Disable) button in
the PG Setup -> Data Output screen.
2
Connect the DUT to the pattern generator’s Data Out port and the error
detector’s Data In port. Refer to the Getting Started Guide.
3
Terminate all non-connected pattern generator output ports with 50 Ω.
4
Switch to the Pattern panel and click Pattern Select.
5
Select an appropriate pattern, for example a pure 2^15–1 PRBS, for both the
pattern generator and the error detector.
6
Specify the logic levels and the bit rate for the pattern generator setup. For
example, select ECL levels and a clock speed of 1250 MHz. This corresponds
to a clock period of 0.8 ns.
6 Advanced Analysis
320 Agilent J-BERT N4903B High-Performance Serial BERT