Introduction The voltage and current of a first order system excited by a sinusoidal signal can be represented by two phasors which are not in phase. In this experiment we will study the steady-state response and the phase angle between voltage and current of a first order system. The complex voltage or current at a given frequency is characterized by only two parameters, amplitude and phase angle. Also, additional time and effort may be saved if these complex quantities are written in polar form. Let us define impedance Z as the ratio of the phasor voltage to phasor current.
Impedance is a complex quantity having dimensions of ohms.
Also, note that the impedance of an inductor and capacitor are functions of frequency. 90 L lag 90 3. Phase Measurement Phase comparison of two signals of the same frequency can be made using the dual trace feature of the scopes in the lab. One end of the resistor must be grounded. Set the vertical Ch1 and Ch2 scales so that each waveform is aproximately equal size on the display.