Battery-Supercapacitor TESTER is a charge and discharger which measures the charge and discharge-time characteristics.
• Potentiostatic Constant voltage discharging measurement (DSC-CV)
• Galvanostatic Constant current discharging; measurement (DSC-CC)
• Constant power discharging measurement
Voltage setting: 0.00-30.00V
Voltage resolution: 0.01V
Charge voltage: 18V
Dsicharge Current setting: 0.10-20.00A
Current resolution: 0.01A
Charging current: 0.10-5.00A,
Charge current resolution: 0.01A
Automatic charge and discharge analysis
Battery capacity test
Wiring method: four-wire detection, voltage measurement and current channel separate wiring to ensure measurement accuracy
cycling charge and discharge, etc.
Bode and Nyquist Plot
In this chapter the two main ways of visualizing Electrochemical Impedance Spectra (EIS), the Nyquist and Bode plot, are presented and it is explained how different EIS of easy electronic circuits will be plotted in the Bode and Nyquist plot. This demonstrates the advantages and disadvantages of the two plots as well as serving as a foundation to understand the analysis of EIS by utilizing equivalent circuits.
As mentioned in the previous chapter there are two main ways to plot an impedance spectrum. One is the Bode plot. This plot is actually two plots in one. The abscissa is a logarithmic scale of the frequency and one ordinate is the logarithm of the impedance Z while the second ordinate is the phase shift Φ.
The advantage of this plot is that all information is clearly visible. A capacitor in parallel to a resistor, which is an important circuit for electrochemical impedance spectroscopy, is visible in this spectrum as a peak in the phase shift. Single components can be easier understood in the Bode plot.
The Nyquist plot is more complex to understand, but due to practical reasons is more popular in electrochemistry. One reason is that the Nyquist plot is very sensitive to changes. Another is that for the most common circuits some parameter can be read directly from the plot. To get a Nyquist plot the negative imaginary impedance –Z’’ is plotted versus the real part of the impedance Z’.
In the following paragraphs some simple components effects on a Bode plot and Nyquist plot will be shown. This is useful, because it is common to create an electronic circuit that represents the electrochemical system under investigation
BATTERY CHARGE - DISCHARGE ANALZYER
- Product Code: BATTERY CHARGE - DISCHARGE ANALZYER
- Availability: In Stock