User guide

Note that a de-emphasis value of 6 dB causes a 50 percent amplitude reduction.
Check the Output of the Pattern Generator with a Scope
If the N4916A 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 N4916A is in "connected" state (after pressing the Connect button),
the pattern generator's output is programmed to a fixed level. The amplitude is set
to 1.2 V, the offset to 0. This yields a signal of ±0.6 V.
The oscilloscope should show the following picture:
If you see only a straight line, ensure that the pattern generator is not disabled and
that it is set up to generate a pattern (e.g. PRBS).
Check the Output of the Pattern Generator with the Error Detector
If you have connected the N4916A to a Serial BERT you can of course check the
output of the pattern generator by means of the error detector.
1
Set up the pattern generator as described above: Set the Data Offset to 0 V and
the Amplitude to 1 V.
2
Set up the error detector as described above.
Solving Problems 9
Agilent J-BERT N4903B High-Performance Serial BERT 499