SU1492314A1 - Digital meter of duration of single electric pulses - Google Patents

Abstract

The invention relates to electrical measuring technology and can be used in digital measuring the duration of pulse signals. The aim of the invention is to improve the accuracy and reduce the measurement time of the duration of a single electric pulse. The goal is achieved by introducing a comparator 15 and a pulse generator 16 into the meter, which makes it possible to double the frequency of the pulses at the input of the counter 12, which is inversely proportional to the pulse duration. As a result, the measurement accuracy is increased by a factor of 2 (or an increase in the measurement speed). In addition, the meter contains a start-pulse shaper 1, a stop-pulse shaper 2, a standard-duration pulse shaper 3, elements OR 4.6 and 8, a saw-tooth generator 5, a saw-voltage generator 7, And 11 element, zero-bodies 9.13, shaper 14 pulses. 1 il.

Description

The invention relates to electrical engineering and can be used in digital pulse duration meters

The aim of the invention is to improve the accuracy and reduce the time of measuring the duration of a single electrical signal. In the drawing, electrical pulses.

The structural diagram of the proposed meter is shown.

The meter consists of a driver 1 start pulse, driver 2 stop pulses, driver 3 pulses of standard duration, the first element OR 4, the first generator 5 sawtooth voltage, the second element OR 6, the second generator 7 sawtooth voltage, the third element OR 8, the first zero -organ 9, first pulse shaper 10, element 11, pulse counter 12, second null organ 13, second pulse shaper 14, comparator 15, third pulse shaper 16, the inputs of the shapers 1, 2, and 3 being connected s and form the input of the meter, the outputs of the shapers 1 and 2 are connected respectively to the first inputs of the OR elements 4 and 8, the output of the OR 4 element is connected to the first inputs of the generators 5 and 7 and the OR element 6, the output of the OR element 8 is connected to the second inputs of the generators 5 and 7 and the OR element 6, the outputs of the generators 5 and 7 are connected respectively to the inputs of the null organs 9 and 13 and the first and second inputs of the comparator 15, the output of which is connected to the input of the shaper 16, the output of which is connected to the third input of the OR element 6, the outputs are zero bodies 9 and 13 are connected respectively Actually with the inputs of the shapers 10 and 14, the outputs of which are connected respectively to the second inputs of the OR elements 4 and 8, the input of the counter 12 is connected to the output of the And 11 element, the first input of which is connected to the output of the OR element 6, and the second with the output of the shaper 3.

The meter works as follows ’.

Shapers 1 and 2 of the start pulse and stop pulse generate the duration of the measured pulse at a given level. A start pulse through the first element OR 4 gets $ to the first input of the first sawtooth voltage generator 5, which then begins to generate a linearly increasing voltage. After the arrival of the stop pulse through 10, the third element OR 8 to the second input of the first sawtooth voltage generator 5, it begins to generate a linearly decreasing voltage. When the linearly decreasing voltage reaches zero, the first zero organ 9 is triggered and the pulse from the output of the driver 10 through the first element OR 4 is fed to the first input of the first sawtooth voltage generator 5, 20 which then again starts to generate a linearly increasing voltage.

For the second sawtooth voltage generator 7, the stop-pulse role is played by the stop pulse, and the stop-pulse role is played by the pulse from the output of the shaper 10. When a pulse arrives from the second pulse shaper 14, the second sawtooth voltage generator 7 30 starts to generate a linearly increasing voltage, and the first sawtooth generator 5 - linearly decreasing voltage and so on.

The steepness of the linearly increasing and linearly decreasing voltages is the same for both generators, as a result of which periodic sequences of triangular pulses are generated at their output, shifted relative to each other by half a period. A periodic sequence of triangular pulses from the output of the first sawtooth voltage generator 5 is supplied to the first input of the comparator 15, the second input of which receives a periodic sequence of triangular pulses from the output of the sawtooth voltage generator 5q 7. At the moment of equal voltage, the comparator 15 is triggered. Thus, at the outputs of the shapers 10, 14 and 16, periodic pulse sequences are formed, which are combined by the second element OR 6 into a periodic pulse sequence with a repetition period equal to half the measured duration.

pulses corresponding to the beginning and end of a time interval equal to

This after K-wave pulses of pulses arrives at the first input of element And II, to the second input of which) a pulse of standard duration is supplied from the output of the former 3, which is emitted at the moment of arrival of the intentional pulse.

During a pulse of standard duration, the pulses from the output of the second element OR 6 pass through the element And 11 and are fixed by the counter 1 2.

The measured duration is determined by the name of the generator, element AND, to the counting pulse of the standard, there are three elements OR, two, the inputs of which are connected by sawtooth generators with inputs for the outputs, comes from the expression m - 3 ¹ ~ N 'where T is the duration of the measured pulse;

N is the number of pulses recorded by the counter of 12 pulses;

D is the duration of the standard pulse.

Since during the time interval corresponding to the formation of a ramp voltage at the output of the first generator 5, a linearly increasing voltage for the first triangular pulse, there is no voltage at the output of the second sawtooth generator 7 of different voltage, the formation of a pulse corresponding to the middle of the measured pulse does not occur. Therefore, this pulse must be included in the reading of the counter 12 pulses, which is reflected in the formula.

Claims (1)

Formula of the invention A digital meter of the duration of single electric pulses, containing the start-pulse and stop-pulse formers, the inputs of which are connected to the input of the device, a sawtooth voltage generator of pulses, the output of which is connected to the input of the pulse counter, a duration of zero-organ voltage outputs, pulse beaters connected to the third OR element, the first inputs of which are connected to the outputs of the start-pulse and stop-pulse formers, the output of the first OR element with the first and the inputs of the first and second sawtooth voltage generators and the first input of the second OR element, the output of the third OR element - with the second inputs of the first and second sawtooth voltage generators and the second input of the second OR element, the output of which is connected to the first input of the AND element, the second input connected to the output a pulse shaper of standard duration, the input of which is connected to the input of the device, which requires that, in order to increase the accuracy and reduce the measurement time, the outputs the second inputs of the first and, it is equipped with a third shaper im35 With * pulses and a comparator, the first input of which is connected to the output of the first sawtooth voltage generator and the second input of the non-sawtooth voltage, the output of the comparator is connected to the input of the third driver, the path of which is connected to the input of the second element OR> to the exit of the second geo-impulses, off to the third