RU1772780C - Device for digital measuring of time interval - Google Patents

Abstract

The invention is used in pulsed technology to measure the duration of single time slots. The device contains two standby generators

Description

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about

The invention relates to a pulsed technique and can be used to measure the duration of a single time interval.

An object of the invention is to expand the measuring range.

In FIG. 1 is a block diagram of an apparatus for digitally measuring time intervals; in FIG. 2 - time diagrams of the operation of the device,

The device for digital measurement of time intervals comprises a standby generator 1 of the main sequence of counting pulses, a standby generator 2 of an auxiliary sequence of counting pulses, a main counter 3, an auxiliary counter 4, a code comparison device 5, a transfer meter b, trigger 7.

The Sgart bus is connected to the first input of the standby generator 1, the output of which is connected to the counting input of the main counter 3, whose bit outputs are connected to the first inputs of the code comparison device 5, the output of which is connected to the (second) inputs of the standby generators 1, 2, the bus The stop is connected to the first input of the standby generator 2, the output of which is connected to the counting input of the auxiliary counter 4, the bit outputs of which are connected to the second inputs of the code comparison device 5, the third input of which is connected to the output of the trigger 7, not the first input is connected to the transfer output of the main counter 3 and the counting input of the counter G, the overflow output of the counter 4 is connected to the second input of the trigger 7,

The device operates as follows.

The device is set to its initial state by a signal supplied to the reset inputs of counters 3, 4, b and trigger 7, while the output of trigger 7 is set to a low level that allows code 5 to be compared to the device 5 (reset targets are not indicated in Fig. 1).

At the time ti (Fig. 2a) of the beginning of the measured time interval Tx, the start-pulse VN starts the waiting rerator 1. From the output of which the main sequence of estimated pulses with a repetition period Ti arrives at the main counter 3

At time t. (Figs. 2a, 3) at the end of the measured time interval with the VK pulse, the standby generator 2 starts, from the output of which an auxiliary sequence of counting pulses with a repetition period Ta, where K is the coefficient K, is supplied to the counter 4

increase accuracy.

The counting results of counters 3 and 4 are constantly compared using a code comparison device 5 and, if during the filling time of counter 3 1z - ti (Fig. 2b), the number of pulses in the auxiliary sequence exceeds the number of pulses in the main sequence by one counting unit , then the code comparison device 5 generates a pulse signal that stops the operation of the generators 1 and 2, and the code

counter 3 contains a digital measurement result,

Otherwise, when the counter 3 is filled with the number of pulses Ms, the transfer pulse arrives at the counter 6 (time t3, Fig. 2d),

In this case, the state of the trigger 7 and ia changes, the control input of the device 5, as well as the codes, receives a high signal level (Fig. 2c), which prohibits the counter codes from comparing 3 and 4.

At time t /, when counter 4 is filled with the number of pulses Nc, from its output the transfer pulse (Fig. 2, e) will switch trigger 7 to the initial state and

the code comparator 3 will continue to compare the codes of the counters 3 and 4. The process will proceed in a similar way until the number of pulses exceeds

auxiliary sequence over the number of pulses in the main sequence (time te, Fig. 2, b),

When this device 5 code comparison

generates a pulse signal, which is stopping the operation of the generators 1, 2,

The measurement result is calculated by the formula

45

Tx - 12 - ti - Px Nc (Ti - T2) h Nx (Ti - T2),

fcc RC - the number of transfer pulses recorded by the counter 6;

NX is the number of pulses recorded in the counter 3;

NC - counter capacity 3.

Claims (1)

SUMMARY OF THE INVENTION A device for digitally measuring time intervals, comprising two input buses, two standby generators, two counters, a code comparison device, the output of which is connected to the second inputs of the first and second standby generators, the first input bus is connected to the first the input of the first standby generator, the output of which is connected to the counting input of the first counter, whose bit outputs are connected to the first inputs of the comparison device, the second inputs of which are connected to the bit outputs of the second counter, the counting input of which is connected to the output of the second waiting generator, the first input of which is connected with a second input bus, characterized in that, in order to expand the measurement range, a third counter and a trigger are inserted into it, the output of which is connected to the control input of the comparison device; the transfer output of the first counter is connected to the counting input of the third counter and the first input of the trigger, the second input of which is connected to the transfer output of the second counter.