Metrix OX9302-BUS, User Manual

Page: 118 / 143

Appendix - "Bus analysis" mode
118
12.4.3. Measurements (CAN Low-Speed)
Diagnosis Use this table to troubleshoot problems on a measurement :
Measurement Description Diagnosis
Vdiff Dom
Measurement of the Vdiff dominant
state

Termination problem

Junction connection (oxidation, bad contact,
etc.)

Cable length not compliant with standard

Significant noise (check the cable route, ground
braid not connected, faulty chassis-ground, etc.)

…
Vdiff Rec
Measurement of the Vdiff recessive
state
VCanH Dom
Measurement of the VcanH dominant
state

Chassis-ground disturbance problem

Common mode problem

Cable length not compliant with standard

Significant noise (check the cable route, ground
braid not connected, faulty chassis-ground, etc.)

Junction connection (oxidation, bad contact,
etc.)

…
VCanH Rec
Measurement of the VcanH recessive
state
Time Rise
Rise time between 10% and 90% of
the Vdiff signal amplitude

Unsuitable or damaged cable (the rise and fall
times increase with the cable impedance)

…
Time Fall
Fall time between 90% and 10% of
the Vdiff signal amplitude
Time Data
Measurement made using the bit time
total

Unsuitable or damaged cable

Significant noise (check the cable route, ground
braid not connected, faulty chassis-ground, etc.)

…