User guide

Instantaneous Measurements - Reference
This section describes all elements of the BER Results window and 8B/10B
Comparison Results windows and their various status indicators:
BER Results Window
This window displays the actual (BER) or cumulative (AccumBER) BER results:
• The BER is the current BER, calculated upon a period of 200ms.
• The AccumBER shows either the accumulated BER of the current
accumulation, or - if no accumulation is running - the results of the most recent
accumulation.
This enables you to monitor real-time BER behavior as you do things such as to
manually adjust the sampling point, to add errors, or to make adjustments to your
device.
Click this button to toggle between BER or AccumBER results.
This area displays the actual error count or cumulative error count.
N O T E
The BER bar below the main menu bar also displays the actual BER. You can drag
the small yellow alarm threshold mark to change the BER Alarm Threshold.
7 Evaluating Results
366 Agilent J-BERT N4903B High-Performance Serial BERT
Accumulated/Actual Button
Error Count/Accum Error Count