SU892408A1 - Device for oscillographic measuring of time intervals - Google Patents

Description

(54) DEVICE FOR OSCILLOGRAPHIC MEASUREMENT OF TIME INTERVALS

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The invention relates to a technique of radio measurements, and is intended for quick measurement of time intervals. Metpjtow electronic markers. .

A device for measuring measurements of time intervals is known, which includes a block of calibrated sweeps and a built-in calibrator for x-scale calibration. The measurement is made by counting the tick marks on the scale grid on the screen of the PCT; eleven}

The disadvantages of the known device are low measurement accuracy and the difficulty of reading the measured time intervals along the scale grid.

It is also known a device for measuring time intervals, a source of reference time intervals (sweep delay generator), consisting of a crystal oscillator, frequency multiplier dividers N, and a device for the time selection of a desired infrared pulse from an off-chip device, and an electron-beam indicator . The measurement is made by combining the beginning and end of the measured pulse with the crosshair of the scale grid and the readout of the change in delay t2l. However, although the device provides high accuracy of measurement, it is very complex and expensive.

Closest to the proposed technical essence is the device

10 for time-scale measurements, containing a sweep generator, the output of which is connected to the input of the electronic switch, and the output of the electronic switch to the input of the horizontal deflection, the source of the reference voltage, a calibrated voltage divider (regulator) with a reading device, the output of which connected to the second.

20 switches and electronic-beam indicator. Calibration signal in the form of mean; The source from the reference voltage source through a calibrated split spruce and sawtooth is a different signal from the scan sweeper, through the electronic switch, alternately fed to the horizontal deflection amplifier. As a result, two points (electronic marks) are highlighted on the screen on the scan line, the distance between which horizontally is determined by the span of the calibration signal. When determining the time interval, these points coincide with the gradigts of the measured section of the oscillogram, and the time interval value is counted on the scale of the reading device of the calibrated voltage divider f3. A disadvantage of the known device is that the amplitude of the calibration voltage does not depend on the steepness of the sawtooth voltage of the sweep generator, therefore, the total accuracy of measuring time intervals includes the error due to the nonlinearity of the sawtooth voltage and temporal instability of its steepness. switch the calibration voltage divider which complicates the device. For the same reason, it is impossible to use when measuring a smooth adjustment of the scanning speed. The purpose of the invention is to reduce the error rate by reducing the influence of the non-linearity of the sweep voltage and the instability of its steepness. The goal is achieved by the fact that a device for oscillographic measurement of time intervals containing a switch, the calibrated voltage sharing with the reporting device and the sweep generator are connected to the corresponding inputs, the oscilloscope scan channel input is equipped with a breaker, and in the sweep generator A resistor is connected to the capacitor charge circuit, which is connected in parallel via an interrupter to the input of a calibrated voltage divider. The drawing shows the block diagram of the device. The device contains a generator 1 times of the screwdriver, time-consuming capacitor 2 and resistor 3, chopper 4, calibrated deductor 5 with a reading device, switch 6, horizontal deflection gain T and oscilloscope electron beam indicator 8. The device operation is f3t as follows. On resist 1р 3, a drop in nagging is formed, the output value of the capacitor 2 charge current. This voltage is through the interrupter 4, which converts the constant voltage to a square wave, and a calibrated divider 5 with a reading device is fed to the input of the switch 6. On the second the input of the switch 6 is supplied sawtooth voltage of the sweep generator 1. These voltages are switched by the switch 6 alternately to the input of the horizontal deflection amplifier 7. The voltage across the resistor 3 is linearly dependent on the charge current of the capacitor 2, therefore, on the slope of the sawtooth voltage. Therefore, the amplitude of the calibration meander formed from this voltage will linearly depend on the steepness of the saw voltage, i.e., the measurement scale will be maintained with changes in the slope. When adjusting the sweep speed (ramping voltage) by varying the charge current of the capacitor 2, the scale will also be maintained. The use of the proposed device makes it possible to increase the accuracy of measuring time intervals by eliminating the error caused by the non-linearity of the saw-tooth voltage and the instability of its 1fusion. Switching is also simplified, since when changing the scanning speed without switching, the time of the reference capacitors does not necessarily switch the calibration voltage divider. It is possible to smoothly adjust the sweep speed during the measurement, which improves the usability. The invention is a device for oscillographic measurement of time intervals, containing a switch, to the corresponding inputs of which a calibrated voltage divider is connected with a reading device and a sweep generator, to the output - an input of the oscilloscope sweep channel, characterized in that, with a diminishing circuit, the error is reduced by the influence of the non-linearity of the sweep voltage and the instability of its steepness, it is equipped with a breakdown, and in the sweep generator a resistor is turned on in the charge circuit of the capacitor, chopper connected n-p m. lt.and

to the input of a calibrated voltage divider.

Sources of information taken into account in the examination

1. The oscilloscope C1-65. Technical description and operating instructions. 4-1 M., Mashpriborintorg, 1973, p. 56-58.

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2. The meter time interval 42-22. Technical description and operating instructions, h. M, ,, Mashpriborintorg, 1973, p. 9, 1O,

3. Bluedin EK and others. Portable oscillographs, M., Shev.radio, 1978, p. 38 (prototype).

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Claims (1)

Claim A device for oscillographic measurement of time intervals, containing a switch, to the corresponding inputs of which a calibrated voltage divider with a reading device and a sweep generator are connected, to the ⁵⁰ output is the input of the sweep channel of the oscilloscope, characterized in that, with a reduction circuit, errors by reducing the influence of voltage nonlinearity sweep ⁵⁵ and its instability steepness, is provided with a chopper, and a scan generator to charge the capacitor circuit is included a resistor, through which a breaker for prison-pard .sh- • .cht.sh 5 892408 6 to the input of a calibrated voltage divider.