SER Limit Result
The Jitter mode SER (Symbol Error Ratio) limit measurement reports whether the signal is limited by "Jitter", "Amplitude" (noise and interference), or equally jitter and amplitude ("Balanced" ). It indicates if the eye will close vertically before it closes horizontally or vice-versa. The SER limit is determined by extrapolating both the Jitter and Amplitude bathtub curves down to their respective SER floors. If the SER floors are within 10% (on a log scale) of each other, the system is considered balanced. If not, the limiting impairment is the one with the higher floor. If both SER floors are below 1E-18, the SER limit cannot be determined and is listed in the Amplitude panel as "Not Limited".
For NRZ signals, the SER Limit measurement results are displayed in the Amplitude panel. For PAM4 signals, the results are displayed in the Eye panel.
More Information
SCPI Command
:MEASure:AMPLitude:SERLimit