User guide

This can be used to see how changes to your device affect the "BER" / "8B/
10B Comparison" / "Bit Comparison without PCIe3 SKPOS" / "Bit Comparison
without USB3.1 SKPOS". You can determine what adjustments improve or
degrade the "BER" / "8B/10B Comparison" / "Bit Comparison without PCIe3
SKPOS" / "Bit Comparison without USB3.1 SKPOS".
Instantaneous Measurements - Procedures
This section describes how to run, monitor, and analyze instantaneous
measurements.
Running Instantaneous Measurements
The Serial BERT's error detector immediately starts calculating the error rate as
"BER" / "8B/10B Comparison" / "Bit Comparison without PCIe3 SKPOS" / "Bit
Comparison without USB3.1 SKPOS" as soon as it receives a valid signal and the
respective error mode settings are done.
N O T E
Both the pattern generator and the error detector must be correctly set up and
connected to the DUT.
To run an instantaneous measurement:
1
Check if all the values in the status line are correct: pattern generator pattern
and bit rate, error detector pattern and bit rate.
2
View the BER/SER/FER/FSR/ISR/DER/cBER display in the top left corner of
the GUI.
If the measurement is running properly, a certain BER/SER/FER/FSR/ISR/
DER/cBER should be displayed here. In most cases the BER/SER/FER/FSR/
ISR/DER/cBER is not a constant value but slightly varying over time. If no BER/
SER/FER/FSR/ISR/DER/cBER is displayed because there are no errors
detected, you can manually insert an error by pressing the Error Add button in
the top right corner of the screen.
When inserting an error, the BER/SER/FER/FSR/ISR/DER/cBER should
increase for a short time and then return to the initial value.
Evaluating Results 7
Agilent J-BERT N4903B High-Performance Serial BERT 363