SU595679A1 - Arrangement for measuring impact excitation-type generator frequency - Google Patents

Description

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The invention relates to the field of electrical measurements and is intended to measure the frequency of the pulses of the generators of hydroacoustic stations and other hydroacoustic devices operating in percussion mode, and can also be used in various areas of radio and pulsed technology in the range of sound and ultrasonic frequencies.

A device for measuring the frequency of continuous and radio pulse signals, containing a reference oscillator and oscilloscope, is known, the principle of which is based on comparing the reference and measured frequencies with recording the measurement result of an oscilloscope from interference figures (Lissajous figures) 1.

However, when measuring the frequency of the radio pulses of the shock excitation generators (BS), due to an arbitrary phase change between the reference and measured oscillations from pulse to pulse, the Lissajous figures with each pulse change their position on the oscilloscope screen, which makes relatively low accuracy.

The aim of the invention is to improve the accuracy of measuring the frequency of a shock excitation generator.

The goal is achieved by the fact that the device for

shock generator frequency measurement, containing a reference signal generator and an oscilloscope connected to the outputs of both generators, equipped with a series-connected threshold unit, a coincidence unit and a trigger pulse generator connected between the second output of the reference signal generator and the shock excitation generator input, as well as the strobe generator connected to the second input of the match block.

The drawing shows a block diagram of a device comprising an oscilloscope 1, a reference signal generator 2, a threshold device 3, a coincidence circuit 4, a gate generator 5, a trigger pulse generator 6.

The operation of the device is as follows.

A radio pulse from the BS is fed to one pair of deflection plates of the electron beam tube of the oscilloscope 1, and a continuous signal from the second signal generator 2 to the second pair.

Odin-time reference signal is given} ia threshold device 3, which forms a short nmf} Lsa at the moment of passing the reference sinusoid through zero once per period.

A Schmitt trigger with a differentiating circuit is used as a threshold device.

kidney outlet. The pulses from the threshold device 3 are fed to the first input of the 4 coincidence circuit, to the second input of which a pulse is generated from the generator 5 of the gate, which is triggered by an external pulse. The length of the strobe is set by paHiioii to several periods of measured frequency. Thus, several short imiuls are removed from the output of the 4 coincidence circuit, the first of which is the start-up generator 6 start. As a peraeto, P1 of the start pulse n of the generator of the strobe “with use of the multivibrators.

A pulse of a certain duration from the heater 6 is fed to the input of the BS, which produces a radio pulse of the same length. Since the beginning of the excitation of the BSE occurs only at the moment of passing the standard sinusoid through zero, regardless of the timing of the siphimoimulsa passage, the phase between the pulse generator of the shock excitation and the generator 2 of the generator 2 remains constant, which leads to a steady image of the Lysage pattern on the screen of the oscillograph 2, which leads to a steady image of the Lissage patterns on the screen, the oscillograph is on the screen of the oscillograph. accuracy and speeds up the process of measuring the BSG frequency.

FORUMAA AND 3 ABOUT AND AND

A device for measuring the frequency of a shock excitation generator, contains a generator of an ego.unini signal and an oscilloscope,

connected to the outputs of both generators, oh; And that is why, for the purpose of accuracy, it is equipped with a successively connected threshold block, a joint block and a trigger pulse generator,

on the other hand, between the second output of the reference signal generator and the generator input of an excitation shock-1, as well as a strobe generator connected to the second input of the coincidence unit.

Information sources,

Irina tions into account at the time of examination 1. M1rsky G. Ya. Ral.ioelectro} first measurements. M., “Energie, 1975, p. 137-- 38.

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