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Keysight Technologies
CAN Eye-Diagram
Mask Testing

Application
Note
Introduction
Eye-diagram mask testing is used in a broad range of today's serial bus applications. An eye-diagram is
basically an infinite persisted overlay of all bits captured by an oscilloscope to show when bits are valid.
This provides a composite picture of the overall quality of a system's physical layer characteristics, which
includes amplitude variations, timing uncertainties, and infrequent signal anomalies.

Eye-diagram testing can be performed on differential Controller Area Network (CAN) signals using a
Keysight Technologies, Inc. 2000, 3000 or 4000 X-Series oscilloscope licensed with the DSOX2AUTO, DSO
3AUTO or DSOX4AUTO trigger and decode option (CAN & LIN), along with the DSOX2MASK, DSOX3MASK
or DSOX4MASK mask test option. Various CAN mask files can be downloaded from Keysight's website at
no charge. Save the appropriate CAN eye-diagram mask files (based on baud rate, probing polarity, and
network length) to your personal USB memory device. The following CAN mask files are available: