Controller Area Network (CAN) Eye-Diagram Mask Testing
应用文章
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) 2.0 signals using a Keysight Technologies, Inc. 1000, 2000, 3000T, 4000 or 6000 X-Series oscilloscope licensed with the CAN/LIN trigger and decode option, along with the 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: