SU516187A1 - Pulse width measuring device - Google Patents

Description

one

The invention relates to a measurement technique and can be used in automated communication devices to determine the minimum duration of telegraph packages.

A known device for measuring the duration of pulses, containing an input signal driver and a digital pulse meter connected in series, a memory element and an indicator.

However, the known device does not allow to measure the minimum. Duration of randomly varying duration of the pulses.

The purpose of the invention is to measure the minimum duration of a randomly varying but pulse duration.

To do this, the proposed device additionally introduces a trigger, two multivibrators waiting, a frequency divider, an adder and a comparison element of two numbers, with the trigger input with the output of the input signal, the trigger output with the main input of the digital pulse width meter and the input of the first multivibrator, whose output connected to the input of the second multivibrator, the input of the frequency divider and the control input of the reference element, the output of the second multivibrator is connected to the reset input of the digital pulse duration meter, the output of the frequency divider is connected to one of the inputs of the adder, the output of the comparison element is connected to another input of the adder, the output of the adder is connected to the recording input of the memory element and the reset input of the frequency divider, and the digital pulse duration meter is connected to the summing inputs of the comparison element , and the memory element outputs are connected to the subtracting inputs of the reference element.

The drawing shows a structural electrical circuit of the proposed device. The device for measuring the duration of imiuls contains a digital pulse width meter 1, made in the form of a series-connected reference generator 2, an electronic key 3 and a pulse counter 4, the outputs of which are connected to the sum. Inputs of the element 5 comparing two numbers and the inputs of memory 6, the outputs and the interconnection To the inputs ind: ikator 7 and to the subtracting inputs of elem meit 5, the control input of which is connected to the output of the waiting multivibrator 8 and the inputs of the second multivibrator waiting 9 and divider 10 cha The input of the multivibrator 8 is connected to the second input of the key 3, which is the main input of the meter 1, directly, and to the input AND of the measured signal through the trigger 12 connected in series and the input signal conditioner 13, the outputs of the multivibrator 9 and the divider 10 are connected respectively to the input reset the counter 4 and the first input of the adder 14, the second input of which is connected to the output of the element 5, and the output to the reset input of the divider 10 and the recording entry of the element 6.

The device works as follows.

Telegraph parcels with randomly varying duration are converted by shaper 13 into rectangular pulses acting on the counting input of trigger 12, which serves to generate rectangular pulses with a duration equal to the time interval between the leading edges of two adjacent pulses, and to eliminate the measurement error introduced by the shaper 13, since the pulse duration at the trigger level of the driver 13 is shorter than the duration of the telegraph package. The output pulse of the trigger 12 unlocks the key 3, through which the reference pulses from the generator 2 arrive at the counter 4, the period of these pulses is much shorter than the minimum duration of the measured pulses. At the trailing edge of the output pulse of trigger 12, multivibrator 8 is triggered, an output pulse triggers element 5, which compares two numbers: the number recorded in counter 4 and the code of the previous telegraph packet recorded in element 6. If the new number is less than recorded in element 6 then an impulse comes from the output of element 5 to one of the inputs of adder 14, which, if there is a corresponding signal, its signal from the output of divider 10 acts on element 6, skidding it with a new number from counter 4. Divider 10 A periodic update of the number recorded in element 6 is observed, which contributes to an increase in accuracy in the presence of false positives of the device. After completing the measurement of the duration of the telegraph package from the multivibrator 9, a reset pulse is sent to the counter 4. After measuring the duration of a large number of pulses, element 6 records the number corresponding to the minimum duration of the telegraph package.

Claims (1)

Invention Formula A pulse width measuring device containing an input signal driver and a digital pulse width meter connected in series, memory element and indicator, characterized in that, in order to measure the minimum duration of randomly varying pulses, it additionally includes a trigger, two waiting multivibrators, a frequency divider, an adder and a comparison element of two numbers, and the trigger input is connected to the output of the generator input signal, the trigger output is connected to the main input of a digital pulse duration meter and to the input of the first multivibrator, the output of which is connected to the input of the second multivibrator, input to bodies and frequency control input of the comparing element, the output of the second multivibrator connected to the reset input of a digital pulse duration meter, the output of the frequency divider is connected to one of the inputs of the adder, the output of the comparison element is connected to another input of the adder, the output of the adder connected to the write input of the memory element and the reset input of the frequency divider, the outputs of the digital pulse width meter being connected to the summing inputs of the reference element, and The inputs of the reference element are connected to the outputs of the memory element.