SU1228024A1 - Method of measuring instantaneous values of electric signals by electron-ray zero indicator - Google Patents

Abstract

The invention relates to the field of radio electronics and allows for improved measurement accuracy. The signal under test is fed to the signal plates of the zero indicator, and the sawtooth voltage of increased amplitude to the temporary plates. The magnitude of the voltage supplied to the signal electrodes (SI) is selected by 1-2 kV less than the screen voltage. SI form a cylindrical lens. A change in the potential of the SI with respect to the potential of the screen leads to a change in the optical power of the lens, and therefore it is possible to pick up such an optical power of this lens that the image of the SI disappears from the screen. The fixture, the equality of the amplitude of the instantaneous value of the signal under study and the reference constant voltage, is changed by the M innovative values of the electrical signals. The description contains an expression that determines the magnitude of the increased amplitude applied to the temporary plates. Delivering a voltage that is negative with respect to the potential of the screen with the SI, eliminates the shadow image of the SI on the indicator screen and reproduces the undistorted image of the signals under study, which allows for an increase in the accuracy of the measurement of electrical signals. (L go tc 00 about y 4

Description

The invention relates to radio electronics and can be used for precision oscillographic measurements of instantaneous values of arbitrary electrical signals in measurement technology.

The known method of precision measurement of instantaneous values of electrical signals with the help of an electron-beam indicator zero, concluding that the signal of the indicator zero was fed to the signal plates of the signal under investigation, to the temporary electrostatic sweep plate and constant voltage equal to the screen voltage to the signal electrodes . The measurement is made by fixing the equality of the amplitude mg of the value of the signal under investigation and the reference constant voltage controlled by the error signals received by 6m of the signal electrodes, while on the screen of the indicator an image of the signal P. under investigation is observed.

However, this measurement method does not justify itself when measuring with universal oscilloscopes, due to the presence on the screen of the zero indicator of the shadow image of the signal electrodes, which worsens the conditions of observation of the signal under investigation,

The purpose of the invention is to improve the measurement accuracy using universal oscilloscopes by eliminating the shadow image of the signal electrodes from the screen of the zero indicator.

This goal is achieved by the fact that, according to the method of measuring the instantaneous values of electrical signals by an electron-beam indicator zero, including applying a zero indicator to the signal plates of the signal under investigation, sweep voltage on temporary plates of the sawtooth voltage and direct voltage signal electrodes electrical signals by fixing the equality of the amplitude of the instantaneous value of the investigated signal and the reference constant voltage controlled by the error signals The bays coming from the signal electrodes are applied to the latter by a constant voltage, negative with respect to the screen, while the temporary plate is given a pulse of the sweep voltage of increased amplitude.

The magnitude of the voltage applied to the signal electrodes is selected by the disappearance of the image of the signal electrodes on the indicator screen and 1-2 kV lower than the screen voltage. In this case, the signal electrodes form a cylindrical lens. A change in the potential of the signal electrodes with respect to the potential of the screen leads to a change in the optical — the power of the lens. With a negative potential of the signal electrodes with respect to the screen, it is possible to pick up such an optical power of this lens, at which the image of the signal electrodes from the screen disappears. The increased amplitude applied to the temporary plates is determined from the expression:

A A + a,

where A is the amplitude of the voltage sweep of the sweep applied to the temporary plates of the electron-beam indicator zero with a visible image of the signal electrodes;

a is the increment of the pulse amplitude of the sweep voltages applied to the temporary plates of the electron-beam zero indicator with the eliminated image of the signal electrodes.

The magnitude of the amplitude increment is determined from the ratio:

where d is the diameter of the signal electrodes; S - time sensitivity

deflecting plates. An increase in the amplitude of the voltage pulse leads to an increase in the intensity of the field deflecting temporary plates, which ensures that the temporal parameters of the image of the electrical signal on the zero indicator screen remain constant. As a result, some of the information on the screen, which is lost when the signal electrodes intersect with the beam, is restored on the zero indicator screen by delaying the signal under study, which is applied to the indicator signal plates from the moment the plane crosses the signal electrodes for a time, the duration of which is determined by the formula:. d

where Y- is the duration of the signal delay;

d is the diameter of the signal electrodes; V - movement speed

on the screen.

Thus, no shadow image of the signal electrodes is observed on the zero indicator screen, and an undistorted image of the signals under study is reproduced.

The use of the proposed method of measuring instantaneous values of electrical signals by an electron-beam zero indicator provides the possibility of widespread use of electron-beam zero indicators for precision measurements of instantaneous values of electrical signals of an arbitrary shape, including universal oscillographs, and reproducing an undistorted image on the screen of the zero indicator The signals under study, Thu, allows for an increase in the accuracy of measuring electrical signals.

Compiled by T. Veremeykina Editor L. Pchelinska Tehred V. Kadar Corrector O. Lugova

Order 2283/45 Circulation 728 Subscription VNIIPI USSR State Committee

on affairs of inventions and discoveries 113035, Koskva, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, Projecto st., 4

Claims (1)

Formula invented A method for measuring the instantaneous values of electrical signals by an electron-beam zero indicator, which includes applying a zero signal to the signal plates of the zero indicator, sweep temporary plates on the sawtooth plates and signal constant voltage electrodes and measurement of the instantaneous values of electrical signals by fixing the equality of the amplitude of the instantaneous value of the signal under investigation and the reference constant voltage, equal to the error signals coming from the signal electrodes, is sufficient so that, in order to improve the measurement accuracy by eliminating the zero image of the signal electrodes from the screen of the indicator, the latter supply a constant voltage, negative across the screen, while on temporary plates impulse voltage sweep of increased amplitude.