Teledyne LeCroy WaveRunner 6 Zi and 12-Bit HRO Getting Started Manual - Manual (Page 75)

Getting Started Manual
922136-00 Rev A 67
B

Eye Diagram - Flat group delay compensation resulting in equalized
preshoot and overshoot. This selection improves the symmetry of
serial eye diagrams. In addition, a fourth-order Bessel frequency
response is implemented.

Flatness - Flat group delay compensation with a brick-wall frequency
response. While this provides the fastest rise time, there is also a
slight penalty of more preshoot and overshoot compared to Eye
Diagram mode. This selection is most often used in narrow-band
RF measurements where it is desired to maintain constant
magnitude response over the oscilloscope passband.