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SDA Operator's Manual
Storing and Recalling Serial Data Patterns into the Trigger
It is often convenient to save frequently used trigger patterns in a file so that you do not have to
repeatedly reenter them. The serial trigger pattern is also stored in the setup file whenever you
save the panel file through the File
Save Setup dialog. So the trigger pattern can be recalled
by simply recalling the corresponding panel file. However, the panel setup file saves the entire
state of the instrument, which may not always be desirable. For this reason, the SDA provides a
way to save the serial trigger pattern separately.
The Save/Recall Pattern control can be used to save the pattern alone.
Using the Serial Pattern Trigger
To select the serial pattern mode, press the Serial button
in the Trigger Setup dialog.
The trigger point appears at the start of the pattern in the data stream on the display, and the
horizontal position knob can be used to position the trace in the same way as for other trigger
modes.
The trigger can be set to single, normal, or auto. In auto mode, the scope will arm and trigger
itself even if the selected pattern is not detected. However, serial pattern triggering is only valid in
the normal or single trigger modes.
Jitter Setup
Jitter measurements are enabled by touching the Jitter button once the signal is set up. The Jitter
dialog contains four display buttons and four measurement buttons. The displays include
Bathtub, Jitter histogram, ISI, and Filtered Jitter. You can switch display modes without re-
acquiring the signal.
The Measurement buttons control which jitter measurements are displayed. The Basic button
displays the total jitter (Tj), Random jitter (Rj), and deterministic jitter (Dj). The Dj Breakdown
button displays the components of Dj — periodic jitter (Pj), duty cycle distortion (DCD), and data
dependent jitter (DDj) — in addition to the basic Rj, Dj, and Tj. The ASDA-J option adds the
Advanced button which, when selected, replaces the Tj, Rj, Dj display with the peak-to-peak and
rms values of the filtered jitter.
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SDA-OM-E Rev H
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