SU1661716A1 - Device for time interval measurement - Google Patents

Abstract

The invention can be used in information-measuring systems. The aim of the invention is to improve the accuracy of measuring the period (frequency) of pulses. The device for determining the time interval contains counters 2 and 7 pulses, triggers 5 and 9, element AND 6, decoder 8, information bus 11. To achieve the goal, element AND 1, pulse generator 3, element OR 4 and control unit 10 are entered into the device. An example of the execution of the control block 10 is given. 2 Il.

Description

this situation, at the same time a single signal disappears at its zero output and, as a result, a single signal appears at the output of the OR-NOT 15 element, enabling the operation of block 16.

In addition, a single signal appears at the unit output of the trigger 19 and on the falling edge of the first, after that, the generator pulse 18, the flip-flop 21 is set to the unit position, the second signal appears at the second output of the control unit 10 and the device is enabled.

The first pulse of the generator 18, after the appearance of the zero signal at the second output of the control unit 10, switches the device into operation, which leads to the disappearance of a single signal at the fourth input and the appearance of a single signal at the third input of the control unit 10, resulting in a zero the signal at the output of the element ILN-NOT 15 and block

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the driving signal, i.e. in this case, the pulse from the output of the driver 12 does not affect the operation of the control unit 10. 0

In that case, before the single signal disappears at the third input of block 10, the signal at the fourth input of block 10 does not appear, then at the disappearance of the signal at the third input of block 10, a single signal appears at the output of the OR-NOT element 15 sixteen,

When a signal appears at the fourth input of the block 10, the shaper 12 outputs a pulse, at the front input of which the registers 13 and 14 record codes located on the first (the number of pulses of the measured 5 frequency) and on the fifth (interval number code) inputs control unit 10. Along the falling edge of the pulse from the output of the former 12, a block 16 is triggered, determining

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The period (frequency) of the pulses of the measured frequency. At the end of the period (frequency) determination, bpok 16 issues a code for this period (frequency) to bus 25 and a signal that the calculation is completed at its second output. On the leading edge of the signal from the second output of block 16, trigger 19 is set to zero, a single signal appears at its zero output blocking the operation of block 16 (the code on the first outputs of block 16 and tires 25 is stored) arriving at bus 26, what is allowed to use the code, which is located on the state bus on the tires 25 (for example, the indication of the period of the measured frequency is allowed). On the falling edge of the first one, when the trigger 19 is set to the zero position, the pulse generator 18, the trigger 21 is set to zero addition, and a single signal appears at the second output of block 0. The control block | 0 returns to its original position.

If a pulse arrives before the signal appears at the fourth input of the control unit 10, the trigger 19 is set to the left position, the single signal from its zero output blocks through the Element OR NOT 15 block 16 and the ijia bus 26, signals the end of the measurement cycle. On tires 25 In this case, there is a zero code indicating that the frequency of the measured pulses is below the lower Threshold. On the falling edge of the first one. After setting the trigger 19 to the zero position, the generator 18 pulse is set to the zero position, and a single signal appears at the second output of the control unit 10. The control unit 10 returns to its original position.

The control unit 10 can be executed on the basis of a microprocessor set in the form of micro computers, which, according to a program based on signals received at the second, third and fourth inputs of block 10, processes codes arriving at the first and fifth inputs, processes the signal output at the second output , and the reference frequency issued to the first output of the block 10.

Thus, the device allows you to determine the time interval that COOT determines the optimal filling.

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counter 7 without overflowing it, and according to the time interval number and code in counter 7, determine the period (frequency) of the pulses of the sequence under investigation, improves the accuracy of determining the period (frequency) of the pulses of the sequence under investigation by determining the exact number of pulses falling into the measurement time interval. In addition, the device allows to signal the values of the frequency of the pulses exceeding the upper or not reaching the lower threshold values, which also increases the accuracy, since there is no shortage of signals. correct results.

Claims (1)

The invention The device for determining the time interval containing the first pulse counter, the first trigger, the first element And the second pulse counter, to the summing input of which the output of the first element I is connected, the decoder, whose inputs are connected to the outputs of the second pulse counter, the second trigger, zero output which is connected to the information input of the first trigger, the output of the decoder is connected to the installation input to the unit position of the second trigger, the information bus, which is connected to the second One of the first element AND, characterized in that, with increasing accuracy of measuring the pulse period, a second element AND, a pulse shaper, an OR element and a control unit, the first trigger information input connected to the first input of the second element, the first output of the control unit connected to the second input of the second element And the clock input of the first trigger, the output of the second element And connected to the clock input of the first pulse counter, the first output of which is connected to the third input of the control unit, four fifth input coupled to zero output of the first trigger, a single output of which is connected to the first input of the first element And, the second outputs of the first pulse counter are connected to the fifth inputs of the control unit 55, the second output of which is connected to the first input of the element OR, the reset input of the first pulse counter, the reset input second trigger and reset input of the second 131661716I pulse counter, the outputs of which the course is connected to the reset input connected to the first inputs of the control unit, the second input of which is connected to the output of the pulse former and the second input of the OR element, pulses. the first trigger, the pulse driver input is connected to the last of the second outputs of the first Mto .t counter