INTERFACE IS ALSO DESCRIBED THAT ALLOWS THE ACCUMULATION OF HIGH QUALITY DATA IN A MINIMUM PERIOD OF TIME.

An ASYST program to automate a.c. impedance analysis of an electrochemical cell Is described. The program conducts the experiment and allows various analysis schemes, such as Kramers-Kronig transforms and nonlinear least-squares data fitting, to be applied to the experimental data. A purpose-built interface is also described that allows the ac. cumulation of high quality data In a minimum period of time.P reviously, the use of the Data conversion and analysis were Ia- W.N.C. G,,rrard ASYST language in instanta- borious and, in some instances, the cir- DSTO, Materials Research neous corrosion rate analysis cuit model was too complicated to be Laboratory, Melbourne, Australia and surface potential map- analyzed by hand. ping was reported. ' The HoWever, the introduction of fre-present paper extends these principles quency response analyzers (for exam-to the automation of a.c. impedance pie, the Solartron 1250, and the Voltech measurements of electrochemical sys- TFA2001) has simplified data collec-tems. Prior to the introduction of labo- tion, although ensuring system equilib-ratory computers and modern instru- rium over long experimental periods i