A computer based technique has been developed to test the performance of complex nonlinear systems, using Matlab/Simulink™ and C/C++. In this approach a dynamic system, represented by its mathematical model, is stimulated by a sequence of sinusoidal signals and the system stability is observed by a stability diagram. Furthermore the technique is developed to test the degree of accuracy and sensitivity of transducers. Such devices are complicated nonlinear, closed-loop, systems in their own right. In this paper the long term stability of a typical pressure transducer model with hard and soft spring effects is examined. The range of use is determined by a shaded stability diagram. In addition performance of a micromachined, silicon, accelerometer is examined. Important properties of the accelerometer such as the degree of accuracy and sensitivity are considered