SU1406494A1 - Cathode-ray oscillograph - Google Patents

Abstract

This invention relates to electrical measuring technology. The electron beam oscilloscope (ELO) contains an attenuator 1, a cathode ray tube 3, a synchronizer 4, a vertical deflection amplifier 2, a sweep generator 5, a backlight amplifier 6, a voltage meter 7, a comparator 8 and a diffraction analog converter 9, a meter for 10 time intervals, a block 13 control, switch, 12, comparator 11. The ELO has enhanced functionality. 1 silt

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The invention relates to electrical measuring technology and can be used to improve the reliability and maintainability of electron beam oscilloscopes,

The purpose of the invention is to expand the functionality of electr; rone beam oscilloscope. : The drawing shows an electron beam oscilloscope, i. The electron-beam oscilloscope contains an attenuator 1, a vertical deflection amplifier 2, an electron-beam tube 3, a synchronizer 4, a sweep generator 5, a backlight amplifier 6, a voltage meter 7, a first comparator 8 and a digital converter 9, from 10 time intervals: the second comparator 1, the switch 12, the control unit 13 and the display unit 14

The output of the attenuator 1 is connected via the vertical deflection amplifier 2 to the vertical deflection plates of the cathode-ray tube. The second output of the amplifier 2 is vertical to the south-east side and connected to the input of the synchronizer 4, the output of which is connected to the input of the sweep generator 5 and the first input of the switch 12 The first output of the generator 5 scan is connected to a horizontally deflected | plates of the cathode-ray tube 3, and the second output - with the input of the amplifier 6 illumination. The first output y: the illuminator 6 is connected to the cathode ray tube modulator 3 and the second output is connected to the third input k4 mmutator 12. The third output of the sweep generator 12 is connected to the second switch of the switch 12. The first input of the first comparator 8 is connected to HFD attenuator 1, and the second input to the first output of the digital-analogue n) generator 9. The output of the switch 12 is connected to the input of the meter 10 time intervals. The second output of the digital-to-analog converter 9 is connected to the first control input of the amplifier 2 vertical deflection, the third output to the first control input of the synchronizer 4, and the fourth output to the second input of the second comparator 11. The first input of the control unit 13 is connected to the output of the first comparator 8, the second inlet - with the output of the meter 10 time

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intervals, and the third input - with the output of the second comparator 11. The first output of the control unit 13 is connected to the control input of the attenuator 1, and the second output - to the input of the display unit 14 The third output of the control unit 13 is connected to the control input of the sweep generator 5, and the fourth output is with the input of a digital-to-analog converter 9 ,. The fifth output of the control unit 13 is connected to the second control input of the vertical deflection amplifier 2. The control input of the switch I2 is connected to the other output of the control unit 13.

The electron beam oscilloscope works as follows.

The signal under investigation acts on the input of the electron-beam oscilloscope and, after passing through the attenuator 1, is amplified by the vertical deflection amplifier 2 and supplied to the vertical deflecting plates of the cathode-ray tube. At the same time, the synchronizer 4 forms from 5 sweep generator. The sawtooth signals generated and amplified by the sweep generator 5 acts on the horizontal deflection plates of the cathode-ray tube 3. The image is illuminated during the time intervals corresponding to the forward sweep stroke produced by the backlight amplifier 6 The output pulses of the booster 6 act on the cathode-ray tube modulator 3, with the result that a waveform image is observed on the screen of the latter.

The amplitude of the signal and its period are measured by a voltage meter 7 and a meter of 10 time intervals, respectively.

In test mode, an electron beam oscilloscope works as follows. I

The control unit 13 through the first output sends a signal to the control input of the attenuator 1, thereby connecting the oscilloscope input to the common bus and setting the division ratio of the signal to 1: 1. At the output of the attenuator 1, a constant voltage is generated at this moment of time measured by

bit balancing,. Measurement is provided by changing the code supplied from the output of control unit 13, depending on the logic level at its first input. The measurement result stored in the operative memory of the device is compared with the value stored in the persistent storage device which corresponds to the healthy attenuator 1. If the result of the comparison is that the stored values differ from each other, the control unit 13 generates a signal at the second output, which provides the ignition corresponding to the defective attenuator of the LED in the display unit 14. If the compared values are equal, then the testing process for the other nodes begins.

The control unit 13 sends a signal to the second control input of the vertical deviation amplifier 2 through the fifth output, sets the gain factor, and through the fourth output and the second output of the digital-to-analog converter 9 sets the vertical control deviation of the first control input of the amplifier 2 equal to displacement amount. At the first output of the vertical deflection amplifier 2, a voltage is generated, which is measured by the second comparator 11 and the DAC 9, at the fourth output of which a compensating voltage is generated, which is given by the code of the control unit 13. The measurement result is compared with the next value stored in the persistent storage device. If the compared values differ from each other, then the control unit 13 generates a signal at the second output, which lights the LED in the display unit 14 corresponding to the faulty amplification 2 of the vertical deflection. If the compared values are equal, the testing process continues.

The control unit 13 generates at the first control input of the synchronizer 4 through the DAC 9 a pulse signal with a predetermined period. On the manager. the input of the switch 12 p. of the control unit 13 is given a signal providing passage through the switch 12 of the signal that is present at the first input of the switch 12. The output signal period

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The switch 12 is measured by a 10 time slot meter. The measurement result is stored in the random access memory (via the second input of the control unit 13) and compared with the value of the signal period of the synchronizer 4 HcnpaBrioro stored in the permanent memory of the control unit of the control unit. If the compared values are not equal, then a second LED is generated at the second output of the control unit 13 the display unit 14, which corresponds to the failure of the synchronizer 4. If the compared values are equal, then the testing continues.

The output of synchronizer 4 triggers a sweep generator 5, to the control input of which clirHan is supplied from the third output of control unit 13, setting a sweep duration of generator 5 that is less than the period of the output signal of synchronizer 4. In this case, the signals with periods equal to the period of the signal at the output of the synchronizer 4, the switch 12 by the signal from the output of the control unit I3 connects a second input to its output. The meter of 10 time intervals measures the signal period at its input and the measurement result is stored in a random access memory. The stored value is compared with the values stored in the persistent storage device. If the compared values are not equal, then the display unit 14 is given a signal indicating the malfunction of the sweep generator 5. If the compared values are equal, then the testing continues.

The control unit 13 connects the third input of the switch 12 to its output and the 10 time interval meter measures the period of the output signal of the backlight amplifier 6. Comparison of the measurement result with the stored value indicates a malfunction of the backlight amplifier 6 if the compared values are not equal. If the values are equal, then the testing ends by issuing to the block 14 a signal indication corresponding to the health of the blocks being tested.

Thus, the operation of the electron beam oscilloscope is determined by

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the operation of the control unit 13, which in the form of a program is enclosed in a permanent storage device.

Claims (1)

Claim 5 Electron-beam oscilloscope containing an attenuator, KOTojaoro: connected to the input of an electron-beam; oscilloscope, and the output through the vertical deflection amplifier to the first vertical deflection plates of the first cathode ray tube, the synchronizer, whose input is connected to the second output of the vertical amplifier deviations, and the output - with the input of the sweep generator, the first output for key No. 1 to the horizontally disconnecting plates of the cathode ray tube, the backlight amplifier, whose input is connected to the second output of the scanner helix, and the first output - with the modulator of the electron beam tube | ki, voltage meter, inclusive | first comparator, first input | which is connected to the output of the attenuator, and digital-to-analog converter, the first output of which is connected to the second input of the first comparator, second output to the first control in odom amplifier ifo deflection, and the third output - with five 0 five 0 five 0 the first control input of the synchronizer, the interval time meter, the display unit and the control unit, the first input of which is connected to the output of the first comparator, the second input to the output of the time interval meter, the first output to the control input of the attenuator, the second output to the input the display unit, the third output to the control input of the sweep generator, the fourth output to the input of the digital-to-analog converter, the fifth output to the second control input of the vertical deflection amplifier, which differs from In order to expand the functionality, a switch and a second comparator are entered into it, the first input of which is connected to the first output of the vertical deflection amplifier, W () the swarm input - to the fourth output of the D / A converter, and the output - to the third input of the control unit, the sixth output of which is connected to the control input of the switch, the first input of which is connected to the synchronizer output, the second input to the third output of the sweep generator, the third input to the second output of the backlight amplifier, and the output to the input of time interval bodies.