User guide

Then the oscilloscope should show an output eye like the following:
If you see a display like above everything is ok.
If you see merely one fixed level, either the N4916A or the output of the Serial
BERT is defective.
Check the Output of the N4916A Using the Error Detector
If you have connected the N4916A to a Serial BERT and have no oscilloscope at
hand, you can use the error detector for checking the output of the N4916A.
1
Set up the pattern generator as described above: Set the Data Offset to 0 V and
the Amplitude to 1 V. Set the De-Emphasis to 6 dB.
2
Press ED Setup and open the Sampling Point Setup page.
3
Set up the error detector:
– Press the Edit button to enter the ED Input Setup Dialog.
– Set the Input to "Normal".
– Set the Input Range to –1 V to +1 V.
– Set the Threshold to "Averaging".
– Set the Termination to 0 V.
Solving Problems 9
Agilent J-BERT N4903B High-Performance Serial BERT 497