SU131684A1 - Instrument for measuring the period of oscillation of the balance of hours - Google Patents

Description

Basically auth. St. No. 129547 describes a device for measuring the oscillation period of a balance of hours in which a coincidence cascade is used to compare reference pulses with pulses from a microphone, the output of which includes a switching trigger for separating pulses of different amplitudes of voltage, and a switch voltmeter. with Zero in the center of the scale to measure the potential of the pulses directly to the value of the period.

The described invention makes it possible to simplify the scheme of the device and apply it in the workshop conditions.

This is achieved by the fact that the coincidence cascade is made in the form of an oscillograph tube, the vertical and horizontal sweeps of which feed voltage from the reference oscillators, and the modulator is supplied with voltage from the rectangular pulse shaping unit from the output voltage of the microphone.

The block diagram of the coincidence cascade is shown in the figure. The horizontal generator / sawtooth pulses are synchronized with a reference generator 2, the frequency of which is selected depending on the required accuracy of the period measurement, the measurement limit, and the probable period error. The frequency of the generator is 3 vertical sawtooth pulses, sweeps are selected depending on the time of testing the clock, the afterglow of the screen of the tube and the required accuracy of the indication. The amplitude values of the voltages of both sweeps are selected depending on the linear dimensions of the oscilloscope tube.

Subsurface voltages — after amplification by paraphase amplifiers 4 and 5, are fed to horizontal and vertical plates of an oscillographic tube 6.

The impulse from the noise of the clock, taken from the microphone 7, after the amplifier 8 and forming it into a short rectangular impulse with the help of the shaping unit 9 is fed to the modulator tube 6, due to which the beam illuminates on the screen of the tube only for the duration of this impulse.

Thus, the oscillographic tube works as a cascade of coincidences, and the screen of the tube with an afterglow captures this coincidence with a flash of a ray as a point with a gradual attenuation of brightness.

If the period deviation in hours from the given one is absent, then the points lie vertically. If the period of the clock is different from the set one, then the points lie inclined to the vertical.

The sign of the angle of inclination of the line formed by the dots is determined by the sign of the time period from the specified one. The value of the angle of inclination of this line determines the magnitude of the error of the period of the clock with the help of the sight and the overlap imposed on the screen of the tube.

 Subject invention

Instrument for measuring the period of oscillation of the balance of hours by author. St. No. 129547, distinguished by the fact that, in order to simplify the testing process, simplify the device circuit and the possibility, 5 {it was used in the workshop conditions, the coincidence cascade is made in the form of an oscillographic tube, the reference generator is connected to the horizontal and vertical scanning, and the microphone is turned on into the modulator circuit through a unit for forming rectangular pulses.