LAUNCH X431 PAD Scopebox User’s Manual
Fig. 4-4
Fig. 4-5 shows the normal secondary (the upper one) and
(the lower one)
primary ignition waveform of direct ignition system. Beause the on/off of
primary circuit is not opening/closing of mechanical contact, but the conduction
of transistor. The primary voltage has no obvious oscillations within the
duration, but the voltage increases during the magnetization process due to
current limiting, and this change can cause corresponding fluctuations of
secondary voltage line as a result of induction of ignition coil.
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