The TIE histogram shows the measured jitter distribution that is the source for the bathtub curve
and total jitter parameter.
1. Touch the Jitter Histogram button. The histogram will be displayed in the center of the
bathtub curve.
2. Touch the Bathtub button to toggle the histogram display off.
DDJ (Synchronous N-Cycle Plot)
The DDj (data dependent jitter) is measured on the data stream when the Conventional jitter
breakdown method is selected. The DDj is measured by finding the average crossing time for
each edge in the data pattern and comparing this to the nominal crossing time, based on the
expected bit rate of the signal under test. This measurement requires a repeating data pattern to
operate. If the data pattern in the signal does not repeat at least once in the acquired data record,
the DDj parameter will indicate zero even though this type of jitter is present. A graphical display
of the DDj can be viewed by clicking the ISI button in the Jitter menu. This display shows the
position error of the average crossing point for each edge in the pattern.
1. Touch inside the DDj Calc Method control and select Synch N Cycle for a repeating pattern
(available for Edge-Ref or Edge-Edge method).
338 SDA-OM-E Rev H
2. Touch the ISI button.
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