Tektronix Waveform Monitors WFM700 Series - Manual (Page 68)

Reference
WFM700 Series Waveform Monitors User Manual 3- 19
Rise overshoot
peak indicator
80% signal fall
level indicator
80% signal rise
level indicator
Upper signal
level indicator
Waveform histogram
Eye measurement readouts
Waveform shape indicator
(20--80% signal level)
Lower signal
level indicator
Fall overshoot
peak indicator
Figure 3- 7: Eye display showing the automatic measurements
Measurement Accuracy Using the Measurement Cursors. If you use the measure-
ment cursors to measure the eye waveform, you may measure a different result
than that shown in the automatic eye measurements readout. This is because the
internal peak detector can measure waveform excursions better than people can
when using their eye to position the cursors.