Teledyne LeCroy QPHY-MOST50 - Manual (Page 19)

QPHY-MOST50e Software Option
920457 Rev B
19
Eye Diagram Testing 1.1, 2.1, 3.1, 4.1
This test is performed at all test points and creates an eye diagram from the input signal and tests it
against the appropriate mask using the specified clock edge. The result reported is the number of
mask hits.
Note: In cases where a large number of mask hits are detected the number of UI displayed will be
reduced to keep the processing time manageable.
Figure 10 - Oscilloscope Configuration after Eye Diagram Tests
Shown on this screen:
• Eye diagram created from the differential input signal after the clock is recovered from the signal
using the FC Golden PLL with Cutoff Divisor of 786 and a PLL Cutoff of 125 KHz.
Figure 11 - Eye Diagram Test Results
In the measurement section:
• P1 is the number of times the eye diagram made contact with the SP1 mask.
• P2 is the number of times the eye diagram did not make contact with the SP1 mask.