Agilent Technologies ESA-E Series User And Programming Manual page 55

3. The zoomed I eye diagram is shown in
with a quadrature error, the crossover points alternately shift
between time records. Because of this, an open triangle pattern
begins to take shape at the decision points (item 1.)
Figure 4-20 Zoomed I Eye Diagram Showing I/Q Quadrature Error
Chapter 4
Making Modulation Analysis Measurements
Interpreting Measurement Results
Figure 4-20. Observe that
41