Yepper, the number I used was 12 undamped, but that is where you the user decide the significant oscillations have ceased as they decay exponentially and go on till all the energy stored is dissipated. As you probably recall you do this test by applying a triangular wave (sawtooth shape) to one winding of the device under test and when you get ready, current is at some predetermined value, you remove the power source and let her ring out.
In ignition systems, the voltage on the plug rises on the first ring (assuming everything is normal) to the plug breakover voltage. When that happens that 18kv or whatever it is clamped to something like 60 volts across the plug gap arc, as the energy stored in the coil (1/2 LI exp2) is dissipated in the Voltage-current across and through the plug gap.
The 60 volts is reflected back in the primary by the turns ratio and stays at that level (think of the voltage across the arc when arc welding) until most of the energy stored in the coil is dissipated...... that is until the coils depleting energy can no longer sustain the voltage drop/current through the plug.....this all happens in a few milliseconds (.001 ish type seconds).
At that time the the plug shuts off, the load on the coil (transformer secondary is removed), the voltage rises as a function of the current flowing at the time (L di/dt again at a new I), and the coil and the shunt cap (almighty condenser) across the points then finish the ringing out, unless the dwell is such that the points have closed and it shunts the cap and the remaining energy is dissipated in the primary circuit dc resistance as heat at the frequency determined by the coils inductance and internal capacitance.
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Today's Featured Article - Identifying Tractor Smells - by Curtis Von Fange. We are continuing our series on learning to talk the language of our tractor. Since we can’t actually talk to our tractors, though some of the older sect of farmers might disagree, we use our five physical senses to observe and construe what our iron age friends are trying to tell us. We have already talked about some of the colors the unit might leave as clues to its well-being. Now we are going to use our noses to diagnose particular smells. ELECTRICAL SMELLS
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