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 - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
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