Eis Fitting Free Software

• ZSimpWin is an Electrochemical Impedance Spectroscopy (EIS) Data Analysis Software integrated with the VersaStudio software to provide straightforward and versatile equivalent circuit model fitting. Innovative concepts have been implemented to achieve the following performance: • Minimal user input: The user specifies a job by selecting a model for an impedance data set, and simply requests execution to ZSimpWin. • Automatic analysis: Parameters associated with the selected model are determined automatically. ZSimpWin assigns an initial guess of these parameters (default = Auto Setup option), starts computation using the initial guess, finds results, improves these results a number of times until desired results are obtained, and then saves the final results. • Batch Analysis: Setup a batch by including multiple jobs and process in sequence. • Output results in various forms: Results consist of plots, estimated parameters, and historical records of computation process.

FRA/EIS: 10µHz-100kHz. Free: included with all Ivium instruments. The software will calculate the best fitting set of parameters with the Levenberg-Marquardt.

Each or several combinations can be printed or copied to Windows clipboard. • Requires only mouse button clicks: The whole process requires no entry of numbers or character strings. • Compatible with Windows XP, 7, 8, and 10.

Bonjour Jacopo, I just have received today the notification of your coments. To answer your first coment, I think it could come from the starting values which must close the best ones when using CPE. Another hint is to try the 'fitNP' string (fit Not Proportionnal). I mean a fit could appear badly completed when estimated by eyes on the Z spectrum when it is good when checking the sum (error(i)/Z(i)) given by the output parameter fval. About your second and interressing coment, I would like to get the data and the modified code. In order to check by myself. First of all, thanks for this program, it's gonna really help me.

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Second: I think that I managed to improve your function so now p() and s() can work with any number of parameters (maybe not 0, but a check is easy to implement); Third I have a question for you: I tried to fit a complex circuit: s(R1,s(p(E2,R1),p(E2,R1))) with some data, but I'he got a fit that was worste then the input parameters (obtained via EIS software analyzer and entered in your program with 3 significant digit). Any idea why? 1/ I tried your string and there was no error. I think the limit in the amount of elements is higher. So there is no problem to simulate data. 2/ Fitting experimental data with long strings will be an other task and you would beware of overparametrization (too many elements) leading to some parameter to have nonsensed values. 3/ I tried your string on some data and get the minimizer failed at the first try.