SU819724A1 - Oscilloscopic time interval meter - Google Patents

Description

The invention relates to electrical engineering and can be used in the study of short time intervals.

Closest to the invention according to 5 technical essence is oscill. a graphical time interval meter, comprising a sawtooth voltage generator, a sweep switch, start and end comparators, start and end movement blocks, a measurement block. rhenium, pulse shapers of the beginning and end, horizontal deflection amplifier and cathode ray tube [1].

The disadvantage of this device is the low accuracy of the measurement, due to the elongation of the luminance marks at fast sweep speeds of 20 sweeps and distortions of the backlight pulses when amplified;

In order to increase the accuracy of the measurement, an oscilloscope measuring the time intervals, containing a ramp oscillator, whose input is connected to the first output of the sweep switch, and the output to the first inputs of the start and end comparators, 30 outputs of which are connected to the first inputs of the start pulse generators and the end, and the second inputs - to the outputs of the blocks of movement of the beginning and end and the information inputs of the measurement unit, the dimension setting input of which is connected with the second output of the switch times wraps, and a horizontal deflection amplifier connected to horizontally deflecting CRT plates with an output, it is equipped with a switching logic block and a switch, the output of which is connected to the control input of the horizontal deflection amplifier 15, and the input is connected to the second output of the switching logic block, the first output of which is connected to the signal the input of the horizontal deviation amplifier, the third input - with the output of the sawtooth voltage generator, and the first and second inputs - with the outputs of the start and end pulse shapers, W Any inputs of which are connected to the third output of the scan switch. Structural electrical diagram of the device shown in the drawing. The device consists of a generator 1 sawtooth voltage sweep. sweep switch 2, start and end comparators 3, 4, start and end blocks 5, 6, start and end blocks 7, start and end pulse shapers 8, 9 switching logic block 10, switch 11, horizontal deflection amplifier 12 and CRT 13 .,

The device operates as follows.

The sawtooth voltage re- | q of the nerator 1 is supplied to the first inputs of the comparators 3, and the regulated DC voltages from the moving blocks 5, 6 are supplied to the second inputs. By changing the DC voltages, the position of the brightness marks of the beginning and end on the waveform is set. The voltage drops from the outputs of the comparators 3, 4 are fed to the inputs of pulse shapers 8.9. The duration of these pulses is determined by the position of the switcher switch 2 and is chosen equal to _ Tr where T _p is the sweep range set by switch 2.

The pulses from the output of the shapers 8, 9 are fed to the second and third inputs of the switching logic block 10, the sawtooth voltage from the output of the generator 1 being supplied to its first input. During the first forward sweep, the sawtooth voltage freely passes through the switching logic block and the amplifier 12 and its the output goes to the horizontally deflecting plates of the CRT 13. On the screen of the CRT 13, an oscillogram of the signal under study is observed. The outputs of the shapers 8, 9 during the first and forward sweep are disabled by block 10 from the input of the switch 11.

During the second forward sweep, the outputs of the shapers 8.9 are connected to the switching logic block 10 to the input of the switch 11. The switch interrupts the passage of the sawtooth voltage in the amplifier 12 for the duration of the start and end pulses. The absence of a sawtooth voltage on the horizontally deflecting plates of the CRT 13 leads to a beam tanning. At the stopping point, a point appears whose brightness exceeds the brightness of neighboring image elements.

The voltage difference from the outputs of the movement blocks 5, 6 is proportional to the measured time interval, taking into account the set sweep speed.

The DC voltage measurement and the display of the light panel in accordance with the true values of the measured time interval is carried out by the measuring unit 7.

The device allows to reduce the measurement error of time intervals.

Claims (1)

parators 3, 4 start and end, blocks 5, 6 move the start and end, measurement block 7, drivers 8, 9 start and end pulses, switch logic block 10, switch 11, horizontal deflection amplifier 12 and CRT 13., The device works as follows in a way. The first inputs of the comparators 3,4 receive the sawtooth voltage of generator 1, and the second inputs the adjustable constant voltages from the movement blocks 5, 6. By varying the values of the constant voltage, the position of the beginning and end marks on the oscillogram is set . The voltage drops from the outputs of the comparators 3, 4 are fed to the inputs of the pulse formers 8.9. The duration of these pulses is determined by the position of the sweep switch 2 and is chosen to be t -1 where Tp is the sweep range set by switch 2. The pulses from the output of the formers 8, 9 are fed to the second and third inputs of the switching logic unit 10, the first input of which is supplied with a sawtooth voltage from the output of the generator 1. During the first direct sweep phase, the sawtooth voltage passes unhindered gack and amplifier 12 and from its output goes to horizontally deflecting plates of a CRT 13. On the screen of a CRT 13 an oscillogram of the signal under study is observed. The outputs of the formers 8, 9 are disconnected by the unit 10 from the input of the switch 11 during the first and forward sweep. During the second forward stroke of the sweep to the switching logic unit 10, the outputs of the formers 8.9 are connected to the input of the switch 11. The switch 11 stops the passage of the sawtooth the voltage in the amplifier 12 for the duration of the beginning and the end of the pulses. The absence of a saw-tooth voltage on horizontally deflecting plates of a CRT 13 leads to a stop of the beam. At the point of stopping, there is a point whose luminance exceeds the brightness of the neighboring image elements. The voltage difference from the outputs of the displacement blocks 5, 6 is proportional to the measured time interval, taking into account the set sweep speed. The measurement of the constant voltage and the reduction of the readings of the light display board in accordance with the true values of the measured time interval is carried out by the measuring unit 7. The device makes it possible to reduce the measurement error of the time intervals. Oscillographic time interval meter containing a sawtooth voltage sweep generator, the input of which is connected to the first output of the sweep switch, and the output to the first inputs of the beginning and end comparators, the outputs of which are connected to the first inputs of the beginning and end drivers, and the second inputs - with the outputs of the beginning and the end movement blocks and the information inputs of the measurement unit, the dimension input of which is connected to the second output of the scan switch, and will amplify A horizontal deflection pin, connected to horizontally deflecting plates by an output. Electron path tube, characterized in that, in order to improve measurement accuracy, it is equipped with a switching logic unit and a switch, the output of which is connected to the control input of the horizontal deflection amplifier / and input to the second output switching logic unit, the first output of which is connected to the signal input US horizontal deflection amplifier, the third input to the output of the sawtooth voltage generator, and the first and second inputs. - with the outputs of the beginning and the end pulse shapers, the inputs of which are connected to the third output of the sweep switch. Sources of information taken into account in the examination 1. Technical description of the oscilloscope: fa C1-100, 1979, USSR (prototype).