TIDUEU6B September 2020 – December 2021 OPA810
It should be noted that ZX is an effective impedance formed by the parallel combination of an actual unknown impedance and ZO (Open circuit Impedance). Let the actual value of the unknown impedance be ZX’, then
As both ZX and ZO are known, ZX’ can be estimated using Equation 13.
Note All the impedances are phasor quantities so the subtraction will be phasor subtraction.