EXFO PSO-200 Optical Modulation Analyzer - Manual (Page 115)

Bit Pattern Analysis and the Gearbox
Optical Modulation Analyzer 107
Obtaining and Using Bit/Symbol Error Rates
The expected pattern graph always overlays the measured pattern (in
bright red) and expected pattern. Points in error can also be displayed in
bright red on all graph types, as shown below.
To highlight error points in red:
From the Display menu, select Highlight Points in Error. Clear the option
to remove the color.
Note: This feature will have an effect on all applicable graphs at once.
To view details about erroneous symbols:
1. In the measurement table, click on the link in BER or SER cells. It will
display symbol numbers with expected and measured I/Q values.
2. Click on any symbol number to zoom on this symbol in pattern graphs.