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Android-based Scopebox User’s Manual
Fig. 4-3 below shows the valid and invalid ignition waveforms. Under the
working status of valid ignition, the breakdown voltage and spark voltage are
higher because the cylinder is filled with fresh combustible mixture gas, which
has a lower ionization level and vice versa.
Fig. 4-3
4.3 Secondary-direct ignition analysis
Connection
：
1) When the high-voltage wire is exposed, plug the BNC end of secondary
ignition pickup into CH1/CH2/CH3/CH4 channel of Scopebox, then
connect the high-voltage clip to high-voltage line, and crocodile clips to
ground.
2) If no high-voltage wire exposes, dismantle ignition coil of tested cylinder
and use direct ignition extension cord. Connect one end to ignition coil
which should be grounded via direct ignition grounding wire, and insert the
other end into cylinder to joint with spark plug. Then plug the BNC end of
secondary ignition pickup into CH1/CH2/CH3/CH4 channel of Scopebox,
then connect the high-voltage clip to high-voltage line, and crocodile clips
to ground.
Connections are shown in Fig. 4-4:
