User guide

2
Click the Bit Recovery Mode button.
The Sync Now button is no longer available.
Note that you can also enable the bit recovery mode from the Pattern window.
Click the Pattern Select icon and then the Error Detector Pattern tab. If this
tab is not available, disable the checkbox Error Detector Pattern tracks the
Pattern Generator Pattern.
3
Click the Auto Align button.
Sampling Point Setup - Reference
N O T E
Depending on the options of your Serial BERT, some of the following functions may
not be valid for your instrument. See “Introduction to the Serial BERT - Concepts ”
on page 11 and “Which Features are Available?” on page 14 for a description of the
available options.
The Sampling Point Setup window provides the following elements:
0/1 Threshold
The 0/1 decision threshold is the reference voltage level for the evaluation of the
incoming data signal. At the sampling point, the data signal voltage ist compared
to the 0/1 decision threshold. Signals greater than this threshold will be measured
as a logic 1; signals below this threshold will be measured as a logic 0.
N O T E
0/1 Threshold cannot be used while Avg. 0/1 Threshold is selected.
The 0/1 Threshold field allows the manual entry of the 0/1 threshold, and displays
the current value.
You can adjust the 0/1 threshold in the following ways:
• Click inside the text field and use the numeric keypad or front panel knob to
enter a value.
• Click anywhere in the sampling point display. The sampling point will be moved
to that location.
• Turn the Decision Threshold knob on the front panel. A small window appears,
displaying the threshold value. This knob can be used at any time, while in any
window.
5 Setting up the Error Detector
198 Agilent J-BERT N4903B High-Performance Serial BERT