SU107368A1 - Device to remove phase-frequency characteristics - Google Patents

Description

The subject of the invention is a device for snooping frequency characteristics, on:) number, when examining a trace of their systems, containing a cathode oscilloscope to compare the input and output voltage of the system under investigation and a spectral machine — ruralin — used as a modulator of modulated transmission voltage wife, iodavaego to the entrance of the investigated system. A feature of the proposed device of this type, which provides an increase in the accuracy of the phase angle comparison of comparative stresses, is the use of the auxiliary selsyn used in the phase regulator, fed from the rotor from the selsyne-generator ator and the input voltage of the system that oscillates. The auxiliary selsyn makes it possible to determine the desired phase angle from the angle of rotation of its rotor, corresponding to the mode of matching the phases of the voltages applied to the oscilloscope. The drawing shows a schematic diagram of the proposed device for removing phase-frequency characteristics. As a low-frequency voltage generator (ranging from 0.1 to 5 Hz), selsyn C-1 was used, whose rotor receives rotation at a constant speed through a reducer P from a large-sized electric motor M. The excitation winding C- / feeds the filter from the network AC 50 Hz. In the phase windings of selsyn, C-1 induces an emf. 50 Hz frequency modulated by low-frequency sinusoidal envelopes. The frequency of modulation depends on the rotational speed of the selsyn syn rotor S-1,

The voltage from the two phase iMOToK of the selsyn C- / is supplied to: one of the investigated IP follower or a regulating system. Voltage from the output of Siemie IC is applied to one pair of oscillographs O, on the other 10 a pair of plates of which is paproped from the secondary winding of the secondary C-2 with a frozen mouth). The Selsin C-2 serves to com- pate the phase angle of voltages applied to the mutually per-diaclic plates of oscillographic graphs.

The moment of the blind shift of the halyard is determined by the picture on the oscilloscope screen. At zero 1vig faults of low ISTOTA, a direct error appears on the screen. The phase angle in gras is counted according to the angle of rotation of the Elsin C-2 rotor, for which the shell of the latter is attached, which can rotate relative to the axis of its gear and be fixed to the desired level. On the axis of the rotor, the Sel1na S-2 is rigidly fixed with an arrow1 C. Before starting work, it is not necessary to reconcile the ul.

A simple solution to the problem of measuring the phase angle of low-frequency voltages provides the structural simplicity of the proposed device, as well as the simplicity of its adjustment and maintenance.

Subject invention

A device for taking the flofrequency characteristics, for example, in the study of tracking systems, containing a cathode oscilloscope to compare alternating voltages of the input and output of the system under investigation and an electrical machine-selsyn used as a generator of modulated alternating voltage. supplied to the input of the system under study, characterized in that, in order to increase the accuracy of the phase angle of the compared voltages, an auxiliary selsyn used as a phase regulator with a retarded rotary rotor fed from the rotor from the selsyn is used to supply the input voltage of the system to the oscilloscope. - generator and allowing to determine the desired angle of phase shift from the angle of rotation of the rotor, corresponding to the matching phase of the voltages applied to the oscilloscope.