RU1800373C - Oscilloscope - Google Patents

Abstract

The invention relates to a measurement technique. The inventive oscilloscope contains a deviation unit 2, a cathode ray tube 4, a scan unit 5, a stroboscopic converter 3 and a synchronization unit 7, the input of which is connected to the synchronization bus, the first and second inputs of the stroboscopic converter 3 connected to the outputs of the synchronization unit 7 and deviation unit 2, the input of which is connected to the measured signal bus, and the output of the scan unit 5 is connected to the first input of the cathode ray tube, and also a comparator 8, the input of which is connected to Odom stroboscopic converter 3. The output synchronization unit 7 is coupled to the input scanner, the output deflection unit is coupled to the second input of the cathode ray tube, a third input connected to the output of the comparator. 2 ill.

Description

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FIELD OF THE INVENTION This invention relates to a radio measurement technique and can be used with an oscilloscope.

The purpose of the invention is to reduce the line width of the waveform, increase the cathode ray tube resource, increase the contrast of the waveform.

The goal is achieved in that an oscilloscope containing a deflection unit, an electron beam tube, a scan unit, a troposcopic converter and a synchronization unit, the input of which is connected to the synchronization bus, the first and second inputs of the stroboscopic converter are connected to the outputs of the synchronization unit and the rejection unit, the input of the deviation unit is connected to the measured signal bus, and the output of the scan unit is connected to the first input of the cathode ray tube, a comparator is introduced, the input of which is connected to the output troboskopicheskogo transducer, the output synchronization unit connected to the input scanner, the output deflection unit is connected to the second input of the cathode ray tube, a third input connected to the output of the comparator.

On Fig, 1 shows a block diagram of an oscilloscope; in FIG. 2 shows the signals at the outputs of buses and blocks. In the figures 1 — bus of the measured signal, 2 — deflection unit, 3 — stroboscopic converter, 4 — cathode ray tube, 5 — sweep unit, 6 — synchronization bus, 7 — synchronization block, 8 — comparator, 9,10,11 12,13 and 14 are signals at the outputs of respectively the bus 1 of the measured signal, the deviation unit 2, the stroboscopic converter 3, the scan unit 5, the synchronization unit 7, and the comparator 8; t is time.

The oscilloscope operates as follows.

The measured pulse signal 9, the next with a frequency of more than 500 Hz, from the bus 1 of the measured signal is fed to the input of the deviation unit 2, which amplifies and delays the signal 9 received at its input. The signal 10 from the output of the deviation unit 2 is fed to the second input of the vertical deviation the cathode ray tube 4 and the second input of the stroboscopic converter 3. After each pulse received at the first input of the stroboscopic converter. 3, a signal is maintained at its output, which is equal to the signal at the second input at the moment the pulse arrives at the first input. From the synchronization bus 6, either a measured signal is input to the input of the synchronization unit 7. 9, or a synchronization signal. The synchronization pulses (signal 13) generated by the synchronization unit 7 are fed from its output to the input of the scan unit 5 and the first input of the stroboscopic converter 3. At the input of each pulse (signal 13), a sawtooth-shaped scan pulse is generated at its output (signal 13) 12). The scan signal 12 from the output of the scan unit 5 is fed to the first horizontal scan input of the cathode ray tube 4, to the third input (cathode) of which the output signal of the comparator 8 is received. Signal 11 from the output of the stroboscopic converter 3

5 is fed to the input of comparator 8. When a signal is received at the input of comparator 8, a signal ranging from-UK to + UK, signal 14 at the output is zero; if the signal at the input of comparator 8 goes beyond - UK to + UK,

0, then the voltage UL is set at the output of comparator 8. Changing the signal from - UK to + UK at the second input of the vertical deflection of the cathode ray tube 4 ensures that the oscillogram line 5 grams up the screen is equal to two values of the width of one implementation of the waveform. When voltage Ui arrives at the third input (cathode) of the cathode ray tube 4, its cathode current

0 decreases to zero, while the image on the screen disappears (the waveform brightness decreases to zero). Upon receipt of the measured signal 9 on the measured signal bus 1 and the synchronization bus 6 and with a zero signal 14 at the output of the comparator 8, an oscillogram of the measured pulses is generated on the screen. If at the moment of receipt of the pulse (signal 13) at the first input of the stroboscopic converter

0 3 signal 10 at the second input of the stroboscopic converter was in the range from-UK to + UK, then at the output of comparator 8 a signal 14 is formed, which is equal to zero, which ensures the formation of a waveform on the screen 5; if at the moment of arrival of the pulse (signal) 13 at the first input of the stroboscopic converter 3, the signal 10 at the second input of the stroboscopic converter was not within

0 from - UK to + UK, a signal 14 equal to Ui is generated at the output of comparator 8, which excludes the formation of an oscillogram on the screen. In the absence of interference and drift, signal 10 at the output of block 2 deviations in

5, the interval between pulses is zero. Due to interference from the power supply to the bus 1 of the measured signal to the deviation unit 2, and also due to periodic changes in the repetition rate of the measured signal 9 near the average value

(which periodically warms up the terminal stage of the deviation unit 2 and causes it to periodically change drift) at the output of the deviation unit 2, a drift occurs in the form of an oscillatory change in the signal ranging from - ZUk to + ZUk. In the presence of a periodic (with a repetition rate of 50 Hz or more) drift signal at the output of block 2, deviations ranging from - ZUk to + 311k at the same output ensures the formation of at least 50 amplified measured pulses every second, during which the drift is in the range - UK to + UK. This ensures the formation of at least 50 waveform realizations per second on the screen, which prevents flickering of the image on the screen, while individual waveform implementations are vertically shifted relative to each other by no more than two line widths of one waveform implementation. When using a cathode ray tube 4 with a long (from tenths to units of seconds) afterglow of the screen, it is possible to reduce to units of hertz the repetition rate of the oscillograms displayed on the screen. This makes it possible to use the oscilloscope either for deviations from - yuyk to + 10UK at a periodic drift value at the output of unit 2, or for a repetition rate of oscillograms up to 10 Hz. Note that the described effect when using a cathode ray tube 4 with a long afterglow The inventive device is not achieved with the prototype when using a cathode ray tube with a long afterglow.

The decrease in the wavelength of the waveform is explained by the fact that, firstly, individual implementations of the waveforms (forming the final waveform perceived by the operator) have a vertical shift of one relative to the other by no more than two line widths of the individual waveform implementation, and, in second, with the exception of drift and interference on the subtractor device available to the prototype.

The increase in the contrast of the waveform is explained by the fact that the oxide cathode of the cathode ray tube 4, pulsed operation (at a repetition rate

the measured signal 9 is more than 500 Hz, the frequency of formation of individual realizations is 10-50 Hz) is capable of delivering a much larger electron beam in the pulse, which increases the brightness and, accordingly, the contrast of the waveform.

The increase in the resource of the cathode ray tube 4 is explained by the fact that the cathode forms an electron beam for a small part (2-10%) of the total time

generating waveforms on the screen.

Claims (1)

SUMMARY OF THE INVENTION Oscilloscope comprising a deflection unit, a cathode ray tube, a unit scan, a stroboscopic converter and a synchronization unit, the input of which is connected to the synchronization bus, the first and second inputs of the stroboscopic converter are connected to the outputs of the synchronization unit and the deviation unit, the input of the deviation unit is connected to the measured signal bus, and the output of the scan unit is connected electronically to the first input beam, characterized by the fact that, in order to reduce the wavelength of the waveform, increase the resource of the cathode ray tube and increase the contrast of the oscilloscope mma, a comparator is introduced, the input of which is connected to the output of the stroboscopic converter, the output of the synchronization unit is connected to the input of the scanner, the output of the deviation unit is connected to the second input of the cathode ray tube, the third input of which connected to the output of the comparator. 0. to a ff, a OWN 1 S Fm.2