Technical data

The source defines how the Serial BERT determines what should be output. The
following alternatives are available:
• Internal
Alternate pattern output is determined internally by the instrument (for
example, from the user interface or remote program).
• External
Alternate pattern output is determined by the signal at AUX IN. This can either
be edge-sensitive or level-sensitive.
• Blanking
Output can be shut off according to the level at AUX IN. If AUX IN high, output
is generated, if AUX IN low, no output.
N O T E
It is important to understand this setting regarding the usage of the signal at the
AUX IN port. If you select External, the signal at AUX IN defines which pattern (A
or B) is sent. If you select Blanking, the signal at AUX IN defines if a signal is sent
at all. The latter also works for standard (not alternating) patterns.
Mode defines how the output is generated. Alternatives are:
• Alternate
Output signal is defined by the selected pattern.
• Oneshot
One instance of pattern B is inserted into the output pattern upon trigger.
• LLevel
Output depends on signal level at AUX IN. If high, pattern B is output, if low,
pattern A is output.
• REdge
Output depends on the signal edge at AUX IN. At rising edge, one instance of
pattern B is output.
AlternatePattern/Select defines what pattern is output. It is only applicable to
Alternate patterns with the Source set to INTErnal or output Blanking. The
following options are available:
• A Half
Only pattern A is output.
• B Half
Only pattern B is output.
3 Recommended Programming Techniques
56 Agilent J-BERT N4903B High-Performance Serial BERT
Source
Mode
AlternatePattern/Select