Data Presentation: Nyquist Plot with Impedance Vector
{"Image DocumentName": "Data Presentation: Nyquist Plot with Impedance Vector", "Image ImageDescription": "Look at the Equation above. The expression for Z(\uf077) is composed of a real and an imaginary part. If the real part is plotted on the X axis and the imaginary part on the Y axis of a chart, we get a Nyquist plot . Notice that in this plot the y-axis is negative and that each point on the Nyquist plot is the impedance Z at one frequency. On the Nyquist plot the impedance can be represented as a vector of length |Z|. The angle between this vector and the x-axis is f. Nyquist plots have one major shortcoming. When you look at any data point on the plot, you cannot tell what frequency was used to record that point. Low frequency data are on the right side of the plot and higher frequencies are on the left. This is true for EIS data where impedance usually falls as frequency rises (this is not true of all circuits). The Nyquist plot the results from the RC circuit. The semicircle is characteristic of a single time constant . Electrochemical Impedance plots often contain several time constants. Often only a portion of one or more of their semicircles is seen.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}