User guide

• The ISR is the current ISR, calculated upon a period of 200ms.
• The AccumISR shows either the accumulated ISR of the current accumulation,
or if no accumulation is running, the results of the most recent accumulation.
This enables you to monitor real-time ISR 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 ISR or AccumISR results.
This area displays the actual illegal symbol count or cumulative illegal symbol
count.
Status Indicators
The BER bar displays the BER calculated upon a period of 200 ms.
You can drag the yellow alarm threshold mark to change the BER Alarm Threshold.
The SER bar displays the SER calculated upon a period of 200 ms.
7 Evaluating Results
372 Agilent J-BERT N4903B High-Performance Serial BERT
Accumulated/Actual Button
Error Count/Accum Error Count
BER bar
SER bar