HP E1725C, Getting Started Manual

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Chapter 4 Demo Waveforms
Demo 1: Data-to-Data
4-10 Getting Started Guide
4
2 Select Segment>Define Segments & Clock.
This window allows you to define the number and position of the segments
and define the clock. Since this drive has a 15.6 ns decode window, the
first distribution (2T) is located at 31.2 ns. The RLL (1,7) coding dictates
that there should be 7 segments. These segment definitions are also used
for window margin calculations. Since data-to-data intervals are used for
display and analysis for this demonstration (instead of data-to-clock), the
clock definition is not required.