SU1241183A1 - Device for measuring time intervals - Google Patents

Abstract

The invention relates to a pulse technique. The purpose of the invention is to increase the speed of the device. The device contains an OR I element, a delay element 2, an AND 4 element and a counter, 5 pulses. The introduction of the multiplexer selector 6 and the implementation of the elements: - that 2 delays in the form of a multi-branch discrete element of the Delay contribute to the achievement of the goal. I il. § W from: go 4

Description

It is necessary to take into account that T txwciKC (txMQKc is the maximum value of the measured time interval).

The counter 5 controls the operation of the selector-multiplexer 6, which connects the corresponding output of the multi-tap delay element 2 with the first input element OR-1. For example, after the first circulation in

the selector-multiplexer b, connects (n -)) - and retraction of the multi-drop element 2. of the control) (having a delay (the invention relates to the pulse technique and can be used to measure the time intervals of the nanosecond range.

The aim of the invention is to improve. speed performance

The drawing shows the block diagram of the device; for measuring time intervals.

The device contains an OR element 1, 10 and a counter 3 fixes a number that equals a multi-lead discrete element 2 to one, which by means of a delay, a delay element 3, an element AND 4, a pulse counter 5, a selector-multiplexer 6, an input bus 7, and the first input the element OR 1 connection- 15 -1) t) with the second input of the element OR 1. Dinne with the input bus 7, the second input. Therefore, a pulse of duration b of the charge OR of U 2 time delay (nl) dt. After the second circulation, the pulse inputs to the secondary outputs of the counter are 5 pulses, 20 with the duration He x - L t the delayed information inputs of the selector are located in the multipath element 2 of the multiplexer 6 connected to the delays. time (n-2) at.

Thus, as the number of circulation increases and, respectively, increases with the output of the AND 4 element and the counter increases with the 5 input of the pulse counter 5, the selector-multiplexer performs the element OR 1 run by directly switching the multi-tap. CTBesHHo and through the element 3 delays, respectively, with the first and second inputs of the element And 4.

The device works as follows.

A pulse whose duration tx is equal to the measured time interval is fed over the bus. 7 and through the element j fixed in the counter 5 pulses. OR 1 to the first input of the element AND 4 - and Time, the measurement in this device the input of the element 3 delay. The delay value dt (measurement resolution) created by delay element 3 is selected based on the required accuracy before measurement. With the release of element 3

I will give a multichannel discrete element 2 delays, the input of which is

delay element 2 change the delay time of the multi-drop element 30 2 delay (change of the circulation period) from the value () At to the value At,

The measurement result is defined as tx, where N is a number, determined by the expression

Thsm

 Fri - at

n (n + 1.)

The form of l. And inventions. eni

A device for measuring time

delays, the measured pulse, the delayed: at the time Lt, is fed to the second input of the element 4, At the output

element 4 produces a pulse, 45 intervals, containing an element whose duration is less than the source OR, the first input of which is connected by the value (L t - to the input bus, the output of the element OR -At), which is detected by the counter connected to the first input of the element And 5 and is fed to the input of the multiway directly and through the first element 2 of the delay. The delay time is with the second input of an elec- trode discrete element 2 of the charge I, the output of which is connected to the support made with n taps, where n 2, m is the number of bits of the counter 5, and the delay is discrete between tj t. The total delay time of the multi-tap delay element 2, i.e. from the first outlet to

to the counting input of the pulse counter and the input of the second delay element, characterized by

by that.

55 in order to improve speed, a selector-multiplexer is introduced into it, and the second delay element is designed as a multi-tap discrete

P-G.O., equal to T nAt. At the same time

It is necessary to take into account that T txwciKC (txMQKc is the maximum value of the measured time interval).

The counter 5 controls the operation of the selector-multiplexer 6, which connects the corresponding output of the multi-tap delay element 2 with the first input element OR-1. For example, after the first circulation in

the selector-multiplexer b, connects (n -)) - and retraction of the retransmitting element 2. of the installation (having a delay (in the meter 3) fixes a number equal to one, which through -1) t) with the second input of the element OR 1. Therefore, a pulse of duration b is delayed in the delayed element 2 of the delay at a time (nl) dt. After the second circulation, the impulse with the duration Xe x - L t is delayed in the two-way element 2W. Delay already for the time (n-2) at.

Thus, as the number of circulation increases and, accordingly, as the counter 5 increases, the selector-multiplexer performs the switching of the tap-offs of the multi-tap.

fixed in the counter 5 pulses. The time measurement in this device

of the delay element 2, the change in the delay time of the multi-drop element 2 of the delay (change in the circulation period) from the value () At to the value At,

The measurement result is defined as tx, where N is the number recorded in the counter 5 Time, the measurement in this

is defined by

sirovanny in the counter 5 Time, measurements in this

Thsm

 Fri - at

n (n + 1.)

The form of l.a. eni

A device for measuring time

 intervals, containing the element, the first input of which is connected to the input bus, the output of the element OR is dinane, and, firstly, through the first input of the element I, with the second input of the element I, the output of which is connected

intervals, containing the OR element, the first input of which is connected to the input bus, the output of the OR element, is connected to the first input of the AND element directly and through the first delay element - to the second input of the AND element whose output is connected

to the counting input of the pulse counter and the input of the second delay element, characterized by

by that.

intervals, containing the OR element, the first input of which is connected to the input bus, the output of the OR element, is connected to the first input of the AND element directly and through the first delay element - to the second input of the AND element whose output is connected

in order to increase speed, a selector-multiplexer, is introduced into it, and the second delay element is made in the form of multi-discrete discrete

312411834

the delay element, the taps of which are connected to the information inputs of the pulses, the output of the selector-multiplexer multiplexer selector, the control unit is connected to the second input of the element, whose inputs are connected to pas OR.

Claims (2)

: measurements containing times— element The device for ny intervals, < OR, the first input of which is connected to the input bus, the output of the OR element is connected to the first input of the And element directly and through the first delay element to the second input of the And element, whose output is connected to the counting input of the pulse counter and the input of the second delay element, about It is preferable that, 55, ⁱⁿ order to improve performance, a selector-multiplexer is introduced into it, and the second delay element is made in the form of a multi-tap discrete 3 1241183 4 delay elements whose taps ^; connected to the information inputs of the selector-multiplexer, the control inputs of which are connected to the discharge outputs of the pulse counter, the output of the selector-multiplexer is connected to the second input of the OR element.