Metrix OX9302-BUS, User Manual

Page: 114 / 143

Appendix - "Bus analysis" mode
114
12.2.3. Measurements (AS-I)
Diagnosis
Use this table to troubleshoot problems on a measurement :
Measurement Description Diagnosis
VAmp
Measurement of the amplitude of the
signal's AC component

Termination problem (load too light)

Cable length not compliant with standard

Faulty junction connection (oxidation, bad
contact, etc.)

Significant noise (check the cable route, ground
braid not connected, faulty chassis-ground, etc.)

…
Time Data
Measurement made using the bit time
total.
The bit time is measured over one
period, because the
AS-I bus uses Manchester coding.
VBat
Measurement of the offset of the DC
part of the signal.
This corresponds to the AS-I bus
power supply.

Unsuitable or damaged cable (load too light)

Cable length not compliant with standard

Faulty junction connection (oxidation, bad
contact, etc.)

Significant noise (check the cable route, ground
braid not connected, faulty chassis-ground, etc.)

…