SU1449968A2 - Device for measuring time intervals - Google Patents

Abstract

The invention relates to measuring technique. The purpose of the invention is to improve the reliability of the measurements. a meter when measuring long time intervals while maintaining accuracy of measurement. Measuring the time intervals in a.s. No. 783747 contains a multiphase generator I, N matching circuits 2, N main counters 3, main adder 4. Introducing the N-input circuit OR 5, counter 6, adder 7 with the formation of additional connections between the elements of the meter allows to achieve the objective of the invention. 2 Il.

Description

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The invention relates to a pulse technique, can be used for measuring with high temporal resolution of long time intervals and is an improvement of the invention according to the authors. Saint R 783747

The aim of the invention is to improve the reliability of the meter when measuring long time intervals while maintaining measurement accuracy.

FIG. A block diagram of the proposed meter is presented, FIG. 2 is a time diagram of the operation of the time interval meter.

The time interval meter contains a multi-phase generator I, the outputs of which are connected to the first inputs of the matching circuit 2, the second inputs of which are connected to the input bus, and the outputs to the inputs of the main counters 3, as well as the main adder 4 whose inputs are the outputs of the bits of the main counters 3, the OR circuit 5, whose inputs are the overflow outputs of the main counters 3, and the output is the input of the additional counter 6, and the additional adder 7, with n higher bits of the output of the adder

4 and the outputs of the counter 6 are connected to the inputs of the adder 7, and the low bits of the outputs of the adder 4 and the outputs of the adder 7 are the outputs of the device.

The meter works as follows.

The multiphase generator 1 introduces N pulse sequences shifted relative to each other by 2fr / N, with a frequency of 6 fpp (N-1) / N, where fnp is the limit frequency of the OR circuit

5 and counter 6. The time interval TK is given by a rectangular impulse, which opens elements 2 of coincidence, and the pulse sequences pass to the inputs of counters 3, each of which is initially recorded with a code one greater than that of the counter, at the input of which the signal leads on a phase on 2ir / N a signal on an input of this counter. Since the counter width

n loggN, then among them there will be a fully filled counter, which on the first pulse at its input will generate a pulse from the overflow

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through the scheme LLI 5 or input counter 6, and the overflow pulse from another counter can only come through

1 N-1 time - ---. Thus, the account Gr Hc

chiki3 count the number of units dis1

fret T-- modulo N, and the score is IO IN

Tick 6 - the number of periods of the clock frequency of the generator 1.

At the output of adder 4, we obtain the code of the duration of the time interval minus some integer number of 5 1 / fo periods recorded in counter 6. The higher bits of this code, which also express an integer number of 1 / fo periods, are summed by adder 7 with the code the output of counter 6, as a result of which a code of a number exceeding w is obtained; its value of the measured time interval in units of the value of the preset code N (N-1) / 2.

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Claims (1)

Invention Formula Meter time intervals for auth.St. No. 783747, characterized in that, in order to improve the reliability of the meter when measuring long time intervals while maintaining measurement accuracy, an N-input OR circuit and an additional pulse counter and an adder are entered, N main pulses having a width n loggN and before starting the measurement in each of these counters is entered a code per unit larger than in the counter, at the input of which the signal is ahead in phase by 2 G / S signal at the input of this counter. a, the overflow outputs of the main counters through the N-input circuit OR unite are added to the input of the additional counter, pulses, and the outputs of the additional counter and the oldest bits of the output of the main adder are connected to the inputs of the additional adder, from the output of which the upper bits of the positional binary code of the measured time interval are read, the lower bits of which are read from the outputs n younger bits of the main adder and which expresses a number that exceeds the number of discretization units of the measured interval by N (Nl) / 2,   - Ig I 5 I ff I / I ill, i i  -H - -H V4-I.  I I I n -If  .g 5 | i /7.1 Phie, 2