Appendix - "Bus analysis" mode
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12.6.3. Measurements (Ethernet 10Base-2)
Diagnosis
Use this table to troubleshoot problems on a measurement :
Measurement
Description
Diagnosis
VHigh
Measurement of the high level
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.)
…
VLow
Measurement of the low level
Time Rise
Rise time between 10% and 90% of
the 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 signal amplitude
Time Data
Measurement taken using total bit
times
Bit time is measured over one period
(Manchester coding).
Unsuitable or damaged cable
Significant noise (check the cable route, ground
braid not connected, faulty chassis-ground, etc.)
…
Jitter
Measurement made using the bit time
total
Significant noise (check the cable route, ground
braid not connected, faulty chassis-ground, etc.)
…
Dist
Measurement of the amplitude
distortion.
The max overshoot level is compared
to the signal peak-to-peak value.
Unsuitable cable impedance
Termination problem (if there is no termination,
major overshoot and the opposite if the bus
impedance is too high)
Significant noise (check the cable route, ground
braid not connected, faulty chassis-ground, etc.)
…
Содержание OX9302-BUS
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