SU42206A1 - The way to deploy images in cathode oscilloscopes - Google Patents

Description

A method of deploying images in cathode oscilloscopes using relaxation schemes is already known, according to which the cathode beam is periodically removed from the screen by applying an auxiliary voltage to the oscilloscope electrodes (or a focusing cylinder). This is caused, as is well known, by the need to obtain only a sweep (time line) on the oscillogram corresponding to the so-called forward path of the beam (the growing part of the electromotive force curve) and to eliminate its reverse direction, creating undesirable additional lines on the oscillogram.

According to the present invention, it is proposed to use not the forward path of the beam corresponding to the period of charging of the capacitor in the relaxation circuit, but a reverse stroke corresponding to the period of discharge of this capacitor, at the same time eliminating the beam from the screen for the time of its forward path.

Typically, re; 1x schemes provide oscillations in the order of 40,000–60,000 lb / s. Such a frequency makes it possible to investigate generators with a frequency of no more than 300000 lp / s oscillogram of the cov

There are 5-8 complete cycles of the curve. When using, according to the invention, to sweep the beam at the same frequency of the scanning circuit, the range of frequencies that can be investigated increases as many times as the return speed is greater than the forward speed. If we take the approximate speed ratio equal to 10, the maximum frequency of the circuit is equal to 50,000 and the maximum tested frequency of 200,000 during a sweep on the forward path (oscillogram 4 periods), switching to the reverse sweep will provide an opportunity to get an oscillogram of 4 period at the investigated frequency of 2,000,000 hertz.

In FIG. 1 shows the electromotive force curve of the relaxation scheme and FIG. 2 is a diagram of an apparatus for carrying out the proposed method.

Capacitor C is charged through the diode ./7j linearly in time. As soon as the voltage on its plates reaches the ignition potential of the thyratron G, determined by the magnitude of the voltage applied to its grid, the latter will come on. In the discharge circuit current will flow, which will create on the resistance R, connected in series with

a certain voltage drop, which will occur with each discharge of capacitor C corresponding to the return path of the beam on the oscilloscope screen. This voltage is applied to an amplifier Y with an appropriate number of amplification stages (in terms of phase) and is applied to an oscilloscope focusing cylinder, the beam of which is absorbed by a constant negative bias from Vy batteries

During the forward run, during the charging of the capacitor C, no voltage arises on the resistance R. During the return period, at the time the capacitor is discharged, the voltage across the resistance / decreases the negative potential on the oscilloscope cylinder, whereby the cathode ray appears again on the screen. Thus, an oscillogram is obtained on the oscilloscope screen, deployed only on the reverse stroke without any side effects. The amplitude of the signals is selected by a potentiometer, and the constant offset is adjusted by a potentiometer JR.

To compensate for some constant residual potential on capacitor C, a potentiometer is inserted in the circuit.

In addition to the increase in the upper limit of the developed frequencies mentioned at the beginning of the description, the circuit can also be used to obtain an oscillogram with a different number of periods, by switching by means of simple manipulations with a raster1 and retracing to the sweep forward, without changing the frequency of the sweep circuit,

Using the proposed method, it is possible to sweep the frequency curves corresponding to waves of the order of 100-150 m.

The subject matter of the invention.

A method of unrolling images in cathode oscilloscopes using relaxation circuits, in which the cathode beam is periodically removed from the screen by applying an auxiliary voltage to the electrodes of the oscilloscope, characterized in that, in order to scan images with a reverse beam path, corresponding to the period of the capacitor discharge, additional negative potential is fed to the oscilloscope focusing cylinder simultaneously with the closing of the battery circuit, charging the capacitor.

to the author's certificate of S. A. Orlov

No. 42206