Cartwaveforms > ignition > primary > Primary Current
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Primary Current Waveform Notes
From the example waveform, the current limiting circuit can be seen in operation. The current switches on as the dwell period starts and rises until the requisite 8 amps is achieved within the primary circuit, at which point the current is maintained until it is released at the point of ignition.
The dwell will expand as the engine revs are increased, this is to maintain a constant coil saturation time, hence the term ‘constant energy’. If the ‘X’ cursor was placed at the beginning of the dwell period and the ‘O’ cursor placed on the induced voltage line, the coil saturation time can be measured. This will remain exactly the same regardless of engine speed.
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