Metrix OX9302-BUS, User Manual

Page: 128 / 143

Appendix - "Bus analysis" mode
128
12.9.3. Measurements (KNX)
Diagnosis
Use this table to troubleshoot problems on a measurement :
Measurement Description Diagnosis
VPower
Measurement of the KNX signal offset
(power supply)

Too many devices on the bus

Cable length not compliant with standard

Faulty power supply

…
VLow Active
Negative pulse low-level
measurement

Faulty transmitter

Cable length not compliant with standard

Termination problem

Significant noise (check the cable route, ground
braid not connected, faulty chassis-ground, etc.)

Faulty junction connection (oxidation, bad
contact, etc.)

…
VMax equalisation
Measurement of the signal high level

Significant noise (check the cable route, ground
braid not connected, faulty chassis-ground, etc.)

Faulty transmitter

…
Uend equalisation
Voltage level compared to VPower
after 104µs.
The 104µs are measured from the
falling edge of the low pulse.

Faulty transmitter

Cable length not compliant with standard

Termination problem

Significant noise (check the cable route, ground
braid not connected, faulty chassis-ground, etc.)

Faulty junction connection (oxidation, bad
contact, etc.)

…
TActive
Measurement made using the bit time
total. Bit time measured only on low
pulses.

Faulty transmitter

Cable length not compliant with standard

Termination problem

Significant noise (check the cable route, ground
braid not connected, faulty chassis-ground, etc.)

Faulty junction connection (oxidation, bad
contact, etc.)

…