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Sampling Point Setup - Reference
N O T E
N O T E
Agilent J-BERT N4903 High-Performance Serial BERT
How to Enable the Bit Recovery Mode
The bit recovery mode (BRM) allows you to measure the relative BER
without knowing the incoming data pattern.
To enable the bit recovery mode:
1 Press the Sampling Point Setup icon in the ED Setup menu.
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.
Depending on the options of your Serial BERT, some of the following functions may
not be valid for your instrument. See
on page 9
and
"Which Features are Available?" on page 11
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.
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 in millivolts.
Setting up the Error Detector
"Introduction to the Serial BERT - Concepts "
for a description of the
4
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