Dynamic current-voltage (DCV) characteristics of materials with non-equilibrium ionic conduction are investigated. Theoretical j-V dependence taking into account non-equilibrium conduction of two types of ions as well as intrinsic (ohmic) conduction is presented. A computer program fitting this dependence to experimental results has been developed. The fitting procedure allows the determination of mobility and concentration of both types of ions as well as the intrinsic conductivity of investigated material. An example of these calculations for SiO2 xerogels is presented.