Tektronix OM4006D, User Manual, Page: 72 / 205

Operating basics
Waveform averaging Two types of averaged display of the eye diagram and signal vs. time are
available. These show a cleaner version of the signal, having a reduced level of
additive noise. The transition average is available by checking Averaging: Show
Transition Average under Analysis Parameters and selecting Show Transition
Average from the right click menu of the eye diagram where the average is to be
displayed. The red trace shows the average of the different transitions between
levels: 0-0, 1-1, 0-1 and 1-0.
The transition parameters listed in the X-Trans, Y-Trans and Pow-Trans sections
of the Measurements table are derived from the transition average curves.
Transition average is available for the
fi eld component eye diagrams, and if the
modulation format is an OOK type, for the power eye diagram.
The linear average is made visible by checking Averaging: Show Linear Average
Eye or Show Linear Average vs. Time. The average is displayed as yellow
traces in any
fi eld eye diagram or Signal vs. Time plot where the linear average
is selected from the right click menu.
48 OM4000D Series Coherent Lightwave Signal Analyzer