Application Note
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 an Agilent
3000 X-Series oscilloscope licensed with the DSOX3AUTO
trigger and decode option (CAN & LIN), along with the
DSOX3MASK mask test option. Various CAN mask files can
be downloaded from Agilent’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:
Introduction
• CAN-diff (H-L) 125kbps-400m.msk
• CAN-diff (L-H) 125kbps-400m.msk
• CAN-diff (H-L) 250kbps-200m.msk
• CAN-diff (L-H) 250kbps-200m.msk
• CAN-diff (H-L) 500kbps-80m.msk
• CAN-diff (L-H) 500kbps-80m.msk
• CAN-diff (H-L) 500kbps-10m.msk
• CAN-diff (L-H) 500kbps-10m.msk
• CAN-diff (H-L) 800kbps-40m.msk
• CAN-diff (L-H) 800kbps-40m.msk
• CAN-diff (H-L) 1000kbps-25m.msk
• CAN-diff (L-H) 1000kbps-25m.msk
Please see attached file for full details.
 | 5991-0484EN.pdf |