What are the Nyquist and Bode plots?
The Nyquist plots displays the imaginary impedance vs. real impedance (Z” vs. Z’) at each frequency (the positive y-axis generally correspond to -Z”). The Bode plots displays both the logarithm of the total impedance and the phase angle as a function of the logarithm of the frequency. Although the Nyquist plots is more commonly displayed for historical reasons, the data in a Nyquist plot is often poorly resolved (particularly at high frequencies), and the explicit frequency dependence is not displayed. In contrast, the Bode plot directly displays the frequency dependence; in addition, the data is well resolved at all frequencies, since a logarithmic frequency scale is used.
