In this paper discusses ways of measuring equipment and, in particular, to a method for monitoring and diagnosis based on the use acoustic emission (AE). Offered by methods can be applied: 1. During cyclic fatigue test different constructions in order to assess their technical condition; 2. During test on the residual strength constructions, as well as in monitoring and diagnosis of technical condition of machines and heavy-duty construction for which the functioning is limited to the damage or unacceptable. 3. To estimate process of destruction of composite structures consisting of a matrix and unidirectional reinforcing elements (fibers)