Tektronix WFM8200 User Manual page 72

Display Information
Usage Notes
56
Jitter Meter: Select to not display the jitter meter or readout (Off), Meter
Only, Readout Only, or Meter and Readout.
Enable Measure: Press the SEL button to enable eye measurement.
Display Type: Select from Eye or Jitter display.
At the end of a long cable, the eye diagram may appear so noisy that there is little
or no discernible opening. In this situation, limited use of the eye diagram is
still possible by selecting Equalized Eye mode. The equalizer compensates for
the effects of cable length by applying an inverse response function and then
reslicing the signal to a logic level. This causes amplitude information to be lost,
but preserves the effects of jitter in the signal.
If the equalized eye display appears clear with a substantial eye opening, then the
signal is likely to be recovered error-free. However, if it appears noisy with little
eye opening, then there is more potential for data errors to occur in the receiver.
WFM8200 and WFM8300 Waveform Monitors