Launch X-431 PAD III Manual page 129

LAUNCH
Fig. 13-3 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. 13-2
Fig. 13-3
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X-431 PAD III User Manual