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ES51920 Datasheet(PDF) 3 Page - Cyrustek corporation |
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ES51920 Datasheet(HTML) 3 Page - Cyrustek corporation |
3 / 11 page Ver 2.1 12/03/01 3 |Z| = 2 2 Xs Rs + Rs = |Zs| cosθ Xs = |Zs| sinθ Xs/Rs = tanθ θ = tan-1(Xs/Rs) If θ > 0, the reactance is inductive. In other words, if θ < 0, the reactance is capacitive. There are two types for reactance. The one is the inductive reactance XL and the other is the capacitive reactance XC. They could be defined as: (f = signal frequency) XL = 2πf L (L = Inductance) XC = C 2 1 f π (C = Capacitance) Measurement mode The impedance could be measured in series or parallel mode. The impedance Z in parallel mode could be represented as reciprocal of admittance Y. The admittance could be defined as Y = G + jB. The G is the conductance and the B is the susceptance. Rs: Resistance in series mode Rp: Resistance in parallel mode Xs: Reactance in series mode Xp: Reactance in parallel mode Cs: Capacitance in series mode Cp: Capacitance in parallel mode Ls: Inductance in series mode Lp: Inductance in parallel mode There are two factors to provide the ratio of real part and imaginary part. Usually the quality factor Q is used for inductance measurement and the dissipation factor D is used for capacitance measurement. D factor is defined as a reciprocal of Q factor. Q = 1 / D = tanθ Q = Xs / Rs = 2πf Ls / Rs = 1 / 2πf Cs Rs Q = B / G = Rp / | Xp | = Rp / 2πf Lp = 2πf Cp Rp Impedance in serial mode Rs jXs Z = Rs + jXs Impedance in serial mode Rs jXs Z = Rs + jXs Admittance in parallel mode Rp jXp Y = 1/Z = 1/Rp + 1/jXp = G + jB Admittance in parallel mode Rp jXp Y = 1/Z = 1/Rp + 1/jXp = G + jB |
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