SU1190268A1 - Method of automatic balancing of section of cathode-ray oscillograph vertical deflection - Google Patents

Abstract

A METHOD FOR AUTOMATIC BALANCING OF A VERTZHALNY DEFLECTION TRACT OF AN ELECTRON-RADIATED OSCILLOGRAPH, which consists in generating a balance correction signal by converting the output signal of the vertical deflection amplifiers and compensating for the unbalance with the generated signal, about a hl of a day, and to get to the unbalance by the generated signal, about 0 h l to accept and to go; making additional distortions of the signal under study, it is supplemented by the fact that the peak value of the output signal of the vertical deflection amplifier is selected and stored at a similar input attenuation factor, the input attenuation coefficient is changed, the peak value of the output of the vertical deflection amplifier is reassigned and remembered with the attenuation coefficient changed, the magnitude of the balance correction signal is determined. From a ratio of 1 (A / D5 OUT 8MiSG CM "- Ms) k (J kB is the correction signal where the balance is J. M c, M J is the smaller and larger attenuation coefficients of the input signal; with . M1 you are .5 peak, S output force values (L of the vertical deflection body with smaller and larger coefficients / attenuation of the input signal; .k - gain factor of the vertical deflection amplifier.

Description

one

The invention relates to electrical measuring technology and can be used in the development of automated oscillographic devices.

The purpose of the invention is to improve the accuracy of balancing without introducing additional distortions of the signal under study.

The drawing shows a structural electrical circuit of the device implementing the method.

The device consists of an attenuator 1, a preamplifier 2 vertical deflection, a terminal amplifier 3 vertical deflection, a cathode ray tube (CRT) 4, a sweep unit 5, a meter 6 amplitude signal parameters, a control unit 7 and a digital-analogue converter (DAC) 8. First input Attenuator 1 is connected to the measured signal bus, the second input is connected to the first output of the control unit 7, and the output is connected to the first input of the preamplifier 2, the second input of which is connected to the output of the DAC 8, and the third input is connected to the second output the house of the control unit 7, the third output of which is connected to the input of the DAC 8, the fourth output - with the first input of the meter 6 amplitude parameters of the signal, and the input with the output of the meter 6 amplitude parameters of the signal, the second input of which is connected to the output of the preamplifier 2 and the input of the final amplifier 3, with an outlet connected to vertically deflecting plates of a CRT 4, the horizontal deflecting plates of which are connected to the output of the scanning unit 5.

The method is implemented as follows.

The signal under study passes through attenuator 1, preamplifier 2 with arbitrarily set transmission coefficients, terminal amplifier 3 and is displayed on CRT 4, and is also fed to the input of meter 6, which measures the peak voltage value and at the output of preamplifier 2. The measured value is remembered in control block 7 and compared with voltage threshold values, corresponding to 90268 .2

maximum and minimum allowable vertical dimensions of the image signal on the screen of a CRT 4. If the peak value of the voltage

misses between

all

threshold values, according to the signal of the control unit 7, the switching factors of the attenuator 1 and the preliminary

amplifier 2 until Ugbix does not fall within the specified interval, i.e., on the screen of the CRT 4, the vertical size of the waveform is set for observation.

Value

and, is stored in control block 7. Then, taking into account the value of tJ g (, ix of the image size stored before the setting, the control unit 7 calculates the magnitude of the balance correction signal by the formula

,) Ugyxw-Uebag K.S

V

Where

- balance correction signal J 4) 6 smaller and larger attenuation coefficients of the input signal;

 m.8 x5 peak output values

signal amplifier

vertical deflection, respectively, with smaller and larger

input signal attenuation ratii 1 - vertical amplifier gain

rejection.

The calculated value of O. g is stored in control block 7, converted to analog form by means of a DAC 8, is fed to the compensating input of the pre-amplifier 2, carried out its balancing.

After the next attenuator switch 1, the calculation process

 is repeated, and if in the time interval between switching of the attenuator 1 due to the drift of the pair

meters of amplifier 2 again there is an imbalance of its differential arms, then the value is added to the former and, after converting to DAC 8, the amplifier is additionally balanced.

Due to the unequal transmission to the output of the useful signal amplifier and the unbalance signal when switching the attenuation coefficients of the passive attenuator, the peak values of the output signal of the amplifier are not the same and are known together with

902684

the values of the respective attenuation factors and the gain factor of the amplifier allow us to determine the balance correction signal. 5 The method improves the accuracy of balancing. In its implementation, no additional distortions of the signal under study are introduced. The introduction of automatic backup in the oscilloscope with the automation of the installation of vertical scale does not require substantial instrumentation. , costs.,

entrance

.-

2

four

Claims (1)

METHOD FOR AUTOMATIC BALANCING OF THE VERTICAL REFLECTION OF THE ELECTRON BEAM Oscilloscope, which consists in generating a balance correction signal by converting the output signal of the vertical deviation amplifier and compensating for the unbalance with the generated signal, characterized in that, to increase the additional accuracy of the balancing signal, we supplement it with that isolate and remember the peak value of the output signal of the amplifier of the vertical deviation at the initial ffitsiente attenuation of the input signal, changing the attenuation factor of the input signal, re vschelyayut and storing the peak value of the output divisor Wuxi vertical deflection in the modified attenuation coefficient, determine the amount of balance correction signal from the relation where ll'ts.v - balance correction signal; . - smaller and larger attenuation coefficients of the input signal; mi peak values of the output amplifier of the vertical deviation at lower and higher attenuation coefficients of the input signal; -K - gain of the amplifier vertical deviation. > 1190268 2