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 - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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