I am measuring the admittance of a circuit, by switching a load off and on at different loads. The admittance value I got from the measured voltage drop and current flowing through my circuit. The problem is calculation is only good when the circuit is only resistive or having high power factor (0.9 to 1.0). As soon as the inductive impedance value goes up, the admittance measurement shows discrepancies. Can somebody please throw some light on it?
- Admittance is the reciprocal of impedance.
- Due to the maximum power theorem, maximum power in the load is attained when the load is the conjugate match of the output impedance. This means Rsource=Rload and jsource=-jload
Find the load that draws the maximum power, compute its conjugate (since the source impedance is its conjugate), and take the reciprocal of this conjugate to derive the complex admittance of the circuit's output.