Eye Mode Measurements
In Eye/Mask mode, all of the measurements are made on the color grade/gray scale data, with the exception of average optical power and histogram measurements. Eye mode supports waveforms formatted in NRZ, PAM4, PAM6, and PAM8 depending on the individual measurement or feature. If a measurement does not support a waveform's format, the measurement result displays Signal Type? instead of a value.
NRZ, PAM, and Advanced Eye measurements are displayed on the Results panel. Eye Mask measurements are displayed on the Mask Test panel. The SCPI commands for each type of measurement are located in the following SCPI command nodes:
| Measurement | SCPI Command Node |
|---|---|
| NRZ | :MEAS:EYE
|
| PAM | :MEAS:EYE
:MEAS:EYE:PAM
|
| Advanced Eye | :MEAS:EYE
|
| Eye Mask | :MEAS:MTESt
|
| User | :MEAS:EYE:USER
|
In the :MEASure SCPI subsystem, two identical SCPI nodes exist for Eye mode measurements: :EYE and :CGRade. These nodes are equivalent and you can use either one at any time. For example, the following two commands are equivalent: :MEASure:EYE:FALLtime and :MEASure:CGRade:FALLtime . However, it is recommended that you consistently use the :EYE node in your programs. The :CGRade node is provided for legacy reasons and is not shown in the command topics in the help.
Use the :MEASure:EYE:COMPlete command to set the peak numbers-of-hits required in the color grade database before a color grade measurement is made on the data. Use Eye user measurement commands (:MEASure:EYE:USER) to create custom user-defined measurements that are based on Matlab or Python scripts. When the measurement is created, a button is automatically placed on Eye Mode's User toolbar.