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Transients in Automotive Inductor Signal

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floobydust:
Interesting approach. I figured once a (DC) arc starts, it would load down the coil until energy is depleted, then the arc extinguishes.
Something else must be ending the arc early in continous mode.

SugerSquirrel:
Which Rigol scope are you using, and what are your thoughts on it?

Circlotron:

--- Quote from: floobydust on July 26, 2020, 11:57:10 pm ---Interesting approach. I figured once a (DC) arc starts, it would load down the coil until energy is depleted, then the arc extinguishes.
Something else must be ending the arc early in continous mode.

--- End quote ---
Yes. When you reapply voltage to the primary, the secondary voltage polarity reverses compared to the arc voltage and becomes the primary applied volts x the turns ratio. Usually this voltage is insufficient to re-establish the arc. You don't want to re-establish the arc because this inhibits the coil charging up. Engines that have individual coils connected directly to the spark plug generally have a diode in series with the HV output to prevent this. They are more prone to this situation because of not having the extra gap between the distributor rotor button and dist cap.

Circlotron:

--- Quote from: SugerSquirrel on July 27, 2020, 12:16:40 am ---Which Rigol scope are you using, and what are your thoughts on it?

--- End quote ---
DS2000. Perhaps the thing I like best on it is the deep memory. You can record 65000 frames which makes it easy to scroll back in time and see what led up to something going wrong. Other than that, plenty of comment on it on other forum pages here.

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