Ring Frequency

The natural oscillation rate of a coil's circuit after each pulse fires, similar to how a struck bell rings at its own pitch. For bipolar damped-sine devices like large loop coils driven by capacitor discharge, this ringing appears as a fast tone inside each burst. It's separate from the slower pulse repetition rate. Set by the coil's inductance and parasitic capacitance (f equals 1 divided by 2 pi times the square root of L times C). Typically a few kHz for PEMF loop coils. Reported alongside Frequency in per-setting parameter tables when the waveform is a damped sine.