User guide

The standards demand and the measurement generates jitter with sinusoidal
distribution.
In terms of the Serial BERT, sinusoidal jitter (SJ) and periodic jitter (PJ) with
sinusoidal characteristic are used for the test (see also “How the N4903 Generates
Jitter” on page 401).
Whether SJ or PJ is used depends on the jitter frequency. SJ supports wide
amplitude variations up to some MHz. PJ supports narrow amplitude variations
over a wide frequency range. The measurement switches automatically between
the two sources.
The measurement cannot be executed if jitter generation is totally disabled. SJ and
PJ may be enabled or disabled.
N O T E
SJ and SSC are mutually exclusive to rSSC, so you can have SJ and SSC both on,
but rSSC only, if neither SSC nor SJ are on. If you run a Jitter Tolerance Measurement
while rSSC is active, PJ will be used to perform the measurement.
If desired, you can add additional jitter of random, external, periodic 2 or bounded
uncorrelated origin to the automatically generated jitter.
When the measurement has finished, the jitter composition shown in the Jitter
Setup window is restored.
Target BER
The target bit error ratio must be specified.
The condition for moving from one jitter amplitude step to the next can be set to
Jitter Tolerance Tests 8
Agilent J-BERT N4903B High-Performance Serial BERT 449
Jitter Type