Appendix - "Bus analysis" mode
112
12.1.3. Measurements (ARINC 429)
Diagnosis
Use this table to troubleshoot problems on a measurement:
Measurement
Description
Diagnosis
High AB
Measurement of the signal high
level
Termination problem
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.)
…
Low AB
Measurement of the signal low
level
Null AB
Measurement of the signal in
idle level
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.)
Time Rise
Rise time
Cable length not compliant with standard
Unsuitable or damaged cable (the rise and fall
times increase with the cable impedance)
…
Time Fall
Fall time
Bit Time
Bit duration
Cable length not compliant with standard
Unsuitable or damaged cable
Significant noise (check the cable route, ground
braid not connected, faulty chassis-ground, etc.)
…
½ Bit Time
Half a bit duration
Содержание OX9302-BUS
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