CAN FD Eye-Diagram Mask Testing
Application Notes
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 is especially important for higher speed buses such as the new CAN FD serial bus.
Eye-diagram testing can be performed on a CAN FD differential bus using a Keysight Technologies InfiniiVision 3000T or 4000 X-Series oscilloscope licensed with the DSOXT3AUTO or DSOX4AUTO trigger and decode option (CAN, CAN FD, & LIN), along with the DSOX3MASK or DSOX4MASK mask test option.