SU1451604A1 - Oscilloscopic meter of time parameters of electric signals - Google Patents

Abstract

The invention relates to electrical measuring technique and can be used in portable oscillographic signal temporal parameter measurements. The purpose of the invention is to improve the measurement accuracy - by introducing a linear 7 and an ex-potential 8 amplifiers, a two-way limiter 10 and a trapezoidal signal shaping device 9. When the brightness of the image changes on the screen of the cathode ray tube 5, the signal on the focusing electrode undergoes a change in the signal according to the exponential law, and on the electrode where the potential 4 is determined, the signal changes according to a linear law. In addition, a trapezoidal signal is applied to the focusing electrode. As a result, image focusing is achieved not only in the center of the screen, but also along the edges, 1 or more. ff. G2 (L s

Description

The invention relates to electrical measuring technology and can be used in portable oscillometric measuring devices for time-jetr signals.

The purpose of the invention is to improve the measurement accuracy by ensuring automatic focusing of the image of a signal without a significant increase in hardware costs.

The drawing shows a structural diagram of an oscillographic measuring instrument of time parameters of an electrical signal. five

An oscillographic amplifier consists of a vertical deflection amplifier I, a synchronizer 2, a sweep generator 3, a horizontal deflection amplifier 4, a cathode ray 20 tube 5, a backlight amplifier 6, a linear amplifier 7, an exponential amplifier 8, a keystone generator 9, a two-way limiter 10 signal, a resistor 25 of the initial setting of the resistor, a resistor 12 of the initial focus setting, a resistor 13 of the initial installation of astigmatism, a resistor 14. horizontal movement of the image-30

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The input of the amplifier I vertical deflection is connected to the bus of the signal under study, and the first output is connected with the vertical deflection plates of the cathode ray tube. The second output of the vertical deflection amplifier 1 through the synchronizer 2 is connected to the input of the sweep generator 3. The first output of the oscillator 3 Q is connected to the first input of the horizontal deflection amplifier 4. The second input of the horizontal deflection amplifier 4 is connected to the slider of the horizontal displacement resistor 14 of the signal imitation image on the screen of the electron-receiving tube 5 and to the second input of the trapezoidal signal shaper 9. The second output of the sweep generator 3 is connected to the second input of the illumination amplifier 6, and the third output is connected to the first input of the keystone generator 9.. The output of the horizontal deflection amplifier 4 is connected to the horizontally deflecting plates of the electron-beam tube 5, the output of the trapezoidal signal forming device 9 through the two-way signal limiter 10 is connected to the resistor motor

you are you but ln lp

Q 5

13 of the initial installation of astigmatism, the output of the linear amplifier and the fourth anode of the electron-beam tube 5. The resistor II of the initial brightness setting is connected to the inputs of the linear amplifier 7, the exponential amplifier 8 and the first input of the amplifier 6 backlight. The output of the backlight amplifier 6 is connected to the modulator of the cathode-ray tube 5. The slider of the resistor 12 is connected to the third anode of the cathode-ray tube 5.

The device works as follows

in a way.

The signal under study acts on the input of the vertical deflection amplifier 1, is amplified by it, and arrives at the vertical deflection plates of the cathode-ray tube 5. At the same time, the synchronizer 2 forms from the signals from the second output of the vertical deflection amplifier 1, the synchronization pulses that trigger the sweep generator 3. The sawtooth signals generated by the sweep generator 3 are amplified by the horizontal deflection amplifier 4 and affect the horizontally deflection of the tube of the electron-beam tube 5. The image of the signal on the screen of the tube 5 during the periods of time corresponding to the forward sweep stroke is illuminated by amplifying rectangular pulses the second output of the generator 3 sweep. The gain is produced by the amplifier 6 of the light, the output pulses of which act on the modulator of the cathode ray tube 5. At the same time, using a resistor 14, a horizontal displacement of the image on the CRT screen is performed, and with the help of resistors 11, 12 and 13 focus and astigmatism of the image signal on the screen of the tube 5.

When the operator rotates the slider of the initial setting of the luminance, the negative bias on the modulator of the cathode ray tube 5 decreases (or increases), the tube beam current increases and the image brightness increases. At the same time, the constant voltage at the outputs of the linear amplifier 7 and the exponential amplifier 8, which arouse

at 4t: TKepiMii and the third anode of the cathode-ray tube, respectively. These voltages are summed on these electrodes with voltages that are removed from resistors 12 and 13 at the initial astigmatism and focus setting, respectively. This ensures a more intensive focusing increase of it, which is not relative to the pressure of astigmatism, since the operator perceives the focus of the signal image much sharper than astigmatism. A sawtooth signal from the third output of the 3 sweep generator is fed to the input of the keystone generator 9 of the trapezoidal signal. This signal changes its polarity in the collector circuit of transistor 11, retaining 20 polarities, in the collector circuit with a trap1; a single fuzzing with an adjustable steep front and decay provides a regular pattern, since the duration of the forward stroke of the sawtooth signal is proportional to horizontal length of the screen, i.e. on the x axis.

By using the proposed device, after setting the luminance of the signal on the tube screen, the position of the handles of the resistors 12 and 13 of the focus adjustment and astigmatism can practically not be changed. In the case of daring a cathode-ray tube (because of its failure) or a significant change in the temperature of the surrounding conditions, the adjustment of the resistors 12 and 13 of focusing and astigmatism will be extremely limited.

T2, At the same time, the summation of a sawtooth signal with an adjustable reference voltage U (leads „„ ..

to the fact that at the output of the linear array of pulse images there will be a observer 7 a signal is formed to triangle focused and devoid of shape. After restricting the triangular signal.: Carried out by a two-way image, instead of blurring the image of impulses blurred along the left and right edge of the screen of the truastigmatism.

With the external signal limiter 10 (the limiting levels are selected by adjustable voltage sources), a trapezoidal signal is generated at the output of the limiter 10. Together with the luminance signal (resistor P), the invented formula

thirty

Oscillographic temporal parameter of electrical signals, the contained amplifier of verti. ". Rt.v ..-" to --- --- is the local deviation, the input of which

linear amplifier 7, and for example, 5 is connected to the bus studied by an astigmatism signal (resistor 13), la, the first output is from a vertical

trapezoidald signal acts on a quarter anode electron beam

tube 5, while at the third

The anode of the tube 5 is the luminance signal of the sweep sensor, the first output of which by the amplified amplifier 8 is connected to the first input to the amplification law along with the voltage of the initial focus setting (resistor 1 / :). As a result of the additional exponential rising voltage on the third

the deviation of the plates of the electron-beam tube by a yupshmi, and the second output through the synchronizer - with the input of the generator tube (in addition to the voltage from the resistor 12) and the additional keystone signal to the fourth

l horizontal deviation, the second input of which is connected to the slider of the horizontal displacement resistor 45 of the image of the signal on the screen of the cathode ray tube, and the output with horizontally deflecting plates of the cathode ray tube, the backlight amplifier, the first input of the cathode tube is achieved by focusing and gg pogo connected to the resistor slider

..H. .

the small astigmatism of the signal image is not only at the center of the screen, but also at its edges. At the same time, the voltage and f (x) on the fourth anode of tube 5 become quite close to the dome-shaped dependence, which is optimal for eliminating defocusing and astigmatism along the axis X screen. Formed by forming a preliminary setting of luminance, the second input is with the second output of the sweep generator, and the output is with a modulator of the cathode ray tube, the third anode of which is connected to the slider of the pre-focusing resistor, and the fourth anode with the slider of the pre-astigmatism resistor, H ale H trape1; a uniform ngfp.koenie with an adjustable steepness of the front and the decline provides the specified regularity, since the duration of the forward course of the sawtooth signal y and proportional tional to the length of the screen horizontally, i.e. on the x axis.

By using the proposed device, after setting the luminance of the signal on the tube screen, the position of the handles of the resistors 12 and 13 of the focus adjustment and astigmatism can practically not be changed. In the case of daring a cathode-ray tube (because of its failure) or a significant change in the temperature of the surrounding conditions, the adjustment of the resistors 12 and 13 of focusing and astigmatism will be extremely limited.

„„ .. ..

Thus, instead of blurred images of impulses blurred along the left and right edges of the screen of the tube,

astigmatism impulses image.

 these pulse images will be focused and devoid of

Claims (1)

Formula invented thirty  connected to the signal bus, the first output is with the deviation of the plates by the electron-beam tube, and the second output through the synchronizer - with the input of the sweep generator, the first output of which is connected to the first input l horizontal deviation, the second input of which is connected to the engine of the resistor of horizontal displacement of the image of the signal on the screen of the cathode ray tube, and the output - to the horizontal deflection plates of the cathode ray tube, the backlight amplifier, the first input of which is connected to the engine of the resistor ..H. . preset luminance, the second input is with the second output of the sweep generator, and the output is with a modulator of the cathode ray tube, the third anode of which is connected to the resistor presetting resistor engine, and the fourth anode with the presetting resistor engine, o tl and h a5U5I60A u u and with the fact that, with the aim of pov -.rotyu-beam tube, and the output through. measurement accuracy, it contains a two-sided limiter — it moves the linear1 and the exponential antenna of the pre-fatigue source, the two-sided limiter of astigmatism and the output of a linear forkshravatel trapezoidal sig- nal amplifier, whose input is connected, the first input of which is the resistor slider whose second input is the generator of the luminance setting and the input of the exposure scan, the second input is to the secondary amplifier, the social amplifier whose output of the horizontal displacement resistor is connected to the slider of the resistor is shown on the screen of the electrical focus setting.