Zsimpwin Tutorial -

Fit → Options

In the parameters table, enter starting values:

Represents ideal double-layer capacitance. Rarely achieved in real-world liquid electrochemistry.

ZSimpWin Tutorial: A Comprehensive Guide to EIS Data Fitting

Follow these step-by-step instructions:

Alternatively, click and type your shorthand string (e.g., R(QR) ) into the text field.

You can choose a pre-defined model from the built-in library list.

Now that we've covered the basics of ZSIMPWIN, let's move on to the tutorial. Here's a step-by-step guide to getting started:

In the file dialog, change the file type dropdown to match your extension (e.g., *.* or *.txt ). Select your file and click . zsimpwin tutorial

Click the button on the toolbar or navigate to Model > Select .

| Software | Pros | Cons | |----------|------|------| | | Robust CNLS, fast, lightweight | Old UI, no scripting, Windows only | | EC-Lab | Integrated with potentiostat | Expensive | | PyEIS | Free, Python, automated | Requires coding | | ZView | More modern than ZSimpWin | Similar price, still niche |

Note: ZSimpWin generally expects imaginary impedance values to be input as positive numbers. If your potentiostat exports them as negative numbers, you may need to invert the sign in Excel before importing. Step-by-Step Import Process Open ZSimpWin. Click on > Open (or use the open folder icon).

You can export the fitting results (component values) to a text file. Fit → Options In the parameters table, enter

Use the tool in ZSimpWin to crop out problematic data points before hitting calculate. Excluding the outer edges of noisy data often drastically improves χ2chi squared Fixing/Holding Parameters

Copy your data from Excel and click the Paste button in ZSimpWin.

. It is highly regarded for its ability to perform automatic fitting without requiring initial parameter guesses from the user. 1. Data Preparation and Import