Abstract: An infralow frequency controlled-member transfer function analyzer comprises an electromechanical infralow frequency generator, a rotary transformer mechanically coupled to the output shaft of the electromechanical infralow frequency generator, a matching amplifier, two modulators similar to each other, a differentiator connected to the output of the matching amplifier and through one modulator to one rotor winding of the rotary transformer, a matching filter connected to the output of the matching amplifier in parallel with the differentiator and through the second modulator to the other rotor winding, an A.C.

Abstract: The method of measuring dynamic characteristics of materials consists in obtaining, in the course of measurement, a control current which ensures oscillations of a specimen of a material at a preset amplitude and frequency. Then, real and imaginary components of the control current are discriminated, and two restoring currents are generated; these currents are summated, and the total current is used to control the movement of the specimen; after that, the real and imaginary components of the control current are discriminated for the second time, and their value, as well as the values of the restoring currents and the preset amplitude and frequency of the deformation of the specimen are used to calculate dynamic characteristics of the material.