This paper considers active identification methods for the temporal characteristics of an object in a closed-loop control system. A comparative analysis of binary signals, namely, pseudorandom and regular sequences of rectangular pulses, is performed under a constraint imposed on the output deviation range of the controlled parameter. Using calculations, it is shown that the best signal choice depends on several factors and, first of all, on the noise level; under a sufficiently small noise level, the regular binary sequence of rectangular pulses seems preferable.