EIS300
Electrochemical Impedance Spectroscopy Software

For a complete description of the features and capabilities of the EIS300, click here to open the EIS300 brochure.  You'll need Adobe Acrobat Reader.

Click here to learn more about EIS.

The EIS300TM Electrochemical Impedance Spectroscopy Software measures impedances spanning 15 orders of magnitude over a frequency range of 10 mHz to 1 MHz!  Choose one of three Gamry Potentiostats to measure impedances from 2 milliOhms to 10 teraOhms (1013 Ohms!) with research-grade accuracy.   Many of the limitations of older EIS systems - large footprint, limited high impedance response, high cost - have been eliminated. The EIS300’s unprecedented power and ease of use will revolutionize the way you think about EIS measurements.

The Microsoft® WindowsTM based program runs four different EIS experiments; Potentiostatic EIS, Galvanostatic EIS, Hybrid Galvanostatic EIS,  and Mott-Schottky plots. (Scroll down for more experimental details.) Each experiment’s control parameters are set up in a user-friendly dialog box. Enter the experiment parameters, click the button, and the experiment runs. No more dials or multiple buttons to push or set.

The EIS300 uses Gamry’s exclusive Sub-Harmonic Sampling combined with Digital Signal Processing to make the impedance measurement. It offers an unprecedented combination of performance, compact design, and value.  

The EIS300 data acquisition is performed with the Gamry Framework.  The data analysis is performed using the Gamry Echem Analyst.  Click here for more details on these software platforms.

Data analysis in the Echem Analyst  is easy. Spectra can be fit to standard cell models or custom models created with our graphical Model Editor.  If you prefer to use your own modeling program, we're happy to help.  Gamry EIS300 data files are compatible with ZView 2 (Scribner Associates), ZSimpWin (Ametek), and Equivalent Circuit (Dr. Bernard Boukamp, University of Twente, The Netherlands). We have developed a file converter for Equivalent Circuit.  Contact us if you'd like a free copy.

EIS applications include coatings evaluation, fuel cell characterization, battery testing, corrosion rate determination, mechanistic and kinetic studies, and more. Custom modifications by our Engineering Staff can adapt a EIS300 EIS System for unique applications. 

The EIS300 system, along with any Gamry Potentiostat, can be configured as a turnkey solution and integrated into a desktop or notebook computer.

 

Standard Experiments

  • Potentiostatic EIS:  Acquires an impedance spectrum over a range of frequencies. The electrochemical cell is maintained under potentiostatic control in either two or three electrode configurations. The operator can control AC voltage, DC offset voltage, starting and ending frequencies, and number of data points measured per decade frequency. Full analysis and reporting tools are included.

  • Galvanostatic EIS:  Acquires an impedance spectrum over a range of frequencies. The electrochemical cell is maintained under galvanostatic control.  The operator can control AC current, DC offset current, starting and ending frequencies, and number of data points measured per decade frequency. Full analysis and reporting tools are included.  Galvanostatic EIS is useful for batteries and for corrosion studies in which the open-circuit potential drifts continuously. It's particularly good for batteries because the potential can be measured at very high resolution; that's important because potential values are often quite low in low-impedance batteries.

  • Hybrid Galvanostatic EIS:  A "civilized" form of galvanostatic EIS.  Applies the entered potential  to the cell and uses this initial measurement  to determine the current value to apply in galvanostatic mode to maintain the potential value throughout the frequency range. Subsequent impedance values are used to adjust the AC current to achieve the desired potential. This assures that no excessively high or low values of potential are observed throughout the frequency range.  The operator can control potential,  starting and ending frequencies, and number of data points per decade of frequency.
       

  • Multiplexed Potentiostatic EIS:  Runs impedance scans through an ECM8 Multiplexer. This allows the operator to test up to eight samples off of a single instrument, increasing throughput.
     

  • Mott-Schottky:  A discrete step AC voltammogram. The cell's impedance is measured over a range of DC offset voltages using a single test frequency. Cell resistance and capacitance (assuming a simple series RC model) are plotted in real time as a function of DC voltage. This test is commonly used for semiconductor and film formation studies.
     

Features

  • Continuous AC amplitude and DC offset correction for the most accurate potential and current measurement!
     

  • Lissajous (I vs. E) real-time display at each frequency.
     

  • Bode or Nyquist real-time display of spectrum as it develops.
     

  • Electrically isolated potentiostat for measuring EIS on grounded samples.
     

  • Automatic 9 or 11 decade current ranging.

  • Multiple plot formats, including Bode and Nyquist.
     

  • Impedance or Admittance plots.
     

  • Graphic Model Editor for equivalent circuit models.
     

  • Complex non-linear least squares (Levenberg-Marquardt) or Simplex fit to equivalent circuit models.
     

  • Multiplexed capabilities up to 8 channels (requires ECM8 Multiplexer).

 

Specifications

Some specifications are dependent upon the Gamry Potentiostat in use.  Click here for detailed specifications on Gamry Potentiostats.

Frequency Range
10µHz to 1 MHz

Impedance Error
< 0.5% magnitude, < 0.5° phase.
See EIS Accuracy Contour Plot for each Potentiostat

Applied Signal Amplitude
2.75 uV to 1425 mV rms (Reference 600)

Setup Parameters
Initial & Final Frequency, Points per Decade, AC Amplitude, Estimated Initial Z, DC Offset, Conditioning Time & Potential, Initial Delay Time & Drift Rate, Data Filename, Notes.

Real-Time Plot and Controls
Selectable between Lissajous Figure and E&I versus Time for each point being acquired. Real time spectrum is shown in either Bode or Nyquist format. Pause/Continue, Skip and Abort controls where appropriate. All curves autoscale.

Data Presentation and Analysis
Data analysis is performed in the Gamry Echem Analyst supplied with the EIS300 software.   Adjustable plot scaling and selection of analysis ranges. Analysis types include user selected point, line and model fitting. Report command for automatic hard copy output.

Gamry EIS data files are compatible with ZView 2 (Scribner Associates) and Equivalent Circuit (Dr. Bernard Boukamp, University of Twente, The Netherlands), and ZSimpWin (Ametek).

Plot Types
Bode (linear and log immitance), Nyquist, and Real and Imaginary Immitance versus Frequency. Immitance plotted as either impedance or as admittance.

Model Fitting
Non-linear Least Square or a Simplex fit to a model. Model entry via a graphical schematic (click-and-drag) capture and automatic compilation.

Systems Information

The EIS300 Electrochemical Impedance Spectroscopy Software requires a Gamry Potentiostat to conduct experiments.

Gamry Instruments can supply complete systems including Potentiostat and Software installed in a desktop or notebook computer. Custom computer configurations, software, training and installation are available by special order. Contact us for further details on these systems.

 

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Last revised on Wednesday, January 30, 2008