In this paper we propose an verification (identification) procedure applicable to mixed signal non-linear objects if structure of them are close to the Hammerstein model. Decomposition of the static characteristic is used to get a simple and common approach for a wide class of non-essential non-linear ties and it allows calculating the output signal for any input signal. To deal with the dynamics, coefficients of the differential equation arc used. As a result, the behavior of the object can be fully described using only a small set of parameters, and each of them can be estimated experimentally. The simulation results confirmed the usefulness of the model being proposed.