User guide

N O T E
During measurement logging, the Serial BERT logs data in ten-second intervals.
Your log file may be missing up to the last ten seconds of data. To avoid this
condition, accumulate for 10 seconds longer than desired.
Accumulated Measurements - Procedures
This section describes how to run accumulated measurements and how to analyze
the results:
How to Run Accumulated Measurements
To run accumulated measurements:
1
Ensure that the instrument is set up correctly and that the error detector is
already in synchronization.
2
Click the Accumulation Setup menu item from the ED Setup submenu to check
the settings made for the data accumulation.
See “Error Accumulation - Procedures” on page 220 for details.
3
To begin accumulation, press the Start Accum button on the front panel.
This causes the following events:
• If Prompt for File Name has been selected during setup, you will be asked to
enter a name for the log file before accumulation begins.
• The data display in the Accumulated Results window is reset.
• The recording of data to the measurement log file is reset.
How to Stop Accumulated Measurements
If you specified a single or repeat test, the test runs until the specified end condition
is reached. If you selected a manual test, it will run until you stop it manually.
• Press the Stop Accum button on the front panel to stop the test immediately.
N O T E
Errors are only counted when the signal at the Gate In port is low.
Evaluating Results 7
Agilent J-BERT N4903B High-Performance Serial BERT 377