User guide

3
Terminate PG Data /Out with 50Ohm
4
Terminate PG Clock /Out with 50Ohm
5
Ensure that the error detector follows the generated pattern.
– Press the Auto Align button.
– The error detector should finish the auto alignment successfully and report
a BER of 0.000.
– Manually adjust the ED sample delay by 166 ps.
– Press Sync Now.
– The error detector should report a BER of 0.000.
Check the Output of the Pattern Generator with a Scope
If the N4876A does not produce a signal, check the Data Out of the Serial BERT.
• Connect the Data Output of the pattern generator to an oscilloscope.
N O T E
As long as the N4876A is in "connected" state (after pressing the Enable button),
the pattern generator's output is programmed to a fixed level. The amplitude is set
to 0.8 V, the offset to -0.4 V.
The oscilloscope should show the following picture for Data Out as well as for Aux
Data Out:
9 Solving Problems
516 Agilent J-BERT N4903B High-Performance Serial BERT