harmoonikute sisalduse ruutkeskmise väärtuse ja põhikomponendi ruutkeskmise väärtuse suhe, ratio of the r.m.s. value of the harmonic content to the r.m.s. value of the fundamental term, ratio of the effective value of the harmonic content obtained by subtracting the fundamental factor from a non-sinusoidal alternating quantity to the effective value of the non-sinusoidal quantity, ratio of the r.m.s. value of the fluctuating to the r.m.s. value of the non-sinusoidal value