SU913324A1 - Device for measuring time intervals - Google Patents

Description

The invention relates to electrical engineering and can be used to measure the average duration of an arbitrary number of time intervals.

A device for measuring the average duration of time intervals is known, comprising a time stamp generator, an amplifier shaper, a decade frequency divider unit, a selector, a counting unit. This device is widely used in electron counting frequency meters 1.

- However, the well-known device allows to measure the average duration of N intervals only for the case Ν = Ι0 ^ρ , where p is an integer, since this division by the number of measured intervals is reduced to setting a comma after p the lower digits of the counter.

The purpose of the invention is to expand the functionality by measuring the average duration of an arbitrary number of time intervals.

This goal is achieved due to the fact that in the device containing the generator of time stamps, the driver, the output of which is connected to the first input of the selector, and del2

a frequency, a reversible ¹ counter, an OR element, an automation unit and a start synchronizer are entered, the output of the time stamp generator is under 5 keys to the second input of the selector, the first and second outputs of which are connected respectively to the summing and subtracting inputs of the reversible counter, the outputs of which are connected via the OR element to the first input of the automation unit, the first and second outputs ₍ which are connected respectively to the third and fourth inputs of the selector, the third output of which is under 15 keys to the synchronization input of the frequency divider, the output of which is connected to the second input of the automation unit, the output of the driver is connected to the inverse C-input of the synchronizer

20 start, 5-input of which is the input of the device, and the output is connected to the inputs of the initial installation of the frequency divider, reversible counter and automation unit, the third output of which

25 is the output of the device.

FIG. 1 is a block diagram

devices; in fig. 2 - temporary

diagrams of operation of the device for tea service N = 2.

3

913324

four

The device contains a generator of 1 time stamps, a driver 2, a selector 3, a reversible counter 4, an OR element 5, a frequency divider 6, an automation unit 7, and a start synchronizer 8. FIG. 2 shows: a start signal at the input 9 of the device, cash ³ The signal at the input 10 of the generator 1 Time Stamp, the output 11 sinh1ronizatora 8 starting, the output 12 of the generator 2, the signals respectively on the first 13 and second 14 '.'θ outputs block 7 automatics, signals at summing 15 and subtracting 16 inputs of the reversing counter, signals respectively At the input 17 synchronization and output 18 of the divider 6 frequency, 15 signal at the output 19 of the element 5 OR, the signal at the third output 20 of the automation unit.

The device works as follows. 20

After the start pulse arrives at

input 9, at the output of the start synchronizer 8 (for which the A-flip-flop is used), a pulse of the initial setup is formed, which keeps 25 the device in the initial state until the beginning of the next interval. The process of measuring the average duration occurs in two stages.

At the first stage, when ·} θ unit is present at the output 13 and zero at the output 14 of the automation unit 7, the total duration of N intervals is measured. While the averaged intervals from the output of the 12 driver 2 ^ 35

(TC), synchronized by the A-trigger of the selector 3, are fed to the synchronization input 17 of the frequency divider 6, and the intervals filled with time stamps are fed to the summing input 15 of the reversing counter 4.

The first stage continues until the number of intervals reaches Ν. In this case, at the output 18 of the divider 6, a pulse appears that switches the automation unit 7 (output 45 to 13 to zero, output 14 to one), and the second stage of the device operation begins. At the same time on the subtracting input

16 reversible counter 4 and the input 17 of the synchronizer divider 6 are served met-50 ci'time, and this process continues until the number in the counter 4 reaches zero, which will lead to the appearance of zero at the output 19 of element 5 OR and the end of work 55 devices.

At the second stage of operation, the number T _c , recorded in the reversible counter 4, is converted into a burst of pulses, then fed to frequency divider 6 with a division factor Ν. The number-burst conversion process occurs as follows. After the end of the 'first stage of work on the reversible

counter 4 recorded the number m ~ T ^.

At the second stage of operation, the number t begins to decrease due to the arrival of pulses from generator 1 to the subtractive input 16 of the reversing counter 4. This process continues until the number m on the counter becomes zero, which is fixed through element 5 by the automation unit 7 and output 14 of block 7, a logical zero appears, which contributes to the cessation of the arrival of pulses at the input 16. Thus, the number of 16 pulses received at the input will be. on the subtractive input 16 of the counter 4 a burst of pulses is formed, the number of pulses in which is equal to the total duration of N intervals. Obtained in the second stage, the packet of pulses is fed to the input 17 of the frequency divider 6, where the division into takes place, the result of averaging through the automation unit enters the output 20 of the device.

Claims (1)

Claim A device for measuring time intervals, containing a time stamp generator, a driver, the output of which is connected to the first input of selectors, and a frequency divider, characterized in that, in order to expand its functionality by measuring the average duration of an arbitrary number of time intervals, a reversal estimator is entered into it , the OR element, the automation unit and the synchronizer start, and the output of the time stamp generator is connected to the second input of the selector, the POWER and the second outputs of which are connected respectively but with the summing and subtracting inputs of the reversible counter, the outputs of which through the OR element are connected to the first input of the automation unit, the first and second outputs of which are connected respectively to the third and fourth inputs of the selector, the third output of which is connected to the synchronization input of the frequency divider, the output of which is connected to the second the input of the automation unit, the output of the driver is connected to the inverse C-input of the start synchronizer, whose 5-input is the input of the device, and the output is connected to the inputs of the initial setup, divide I frequency down counter and a switch box whose third output is the output device.