The use of a transformation is proposed by which the results of voltammetric measurements based on diffusion of reversible redox couples to an electrode of any geometry can be presented in the form of a standardized function T. To characterize the time dependence of the diffusion we define the function G(s) by writing the Cottrell response of the species i in the form (I) over bar(i,Cottrell)(s) = +/- K(i)c(i)* G(s)/s where K-i is a constant, c(i)* the bulk concentration of the diffusing species, s the Laplace variable; then we show that : (a) any voltammetric curve ((I) over bar(s)) measured in the same system can be transformed to potential program invariant form by computing the function T = L-1{(I) over bar(s)/G(s)}; (b) the diffusional admittance of the same system is expressed by Y(s) = G(s)dT/dE; (c) one can perform the transformation yielding the potential program invariant form by passing the I(t) function through a numeric filter having 1/G(s) transfer characteristics.