SU817663A1

SU817663A1 - Digital time interval meter

Info

Publication number: SU817663A1
Application number: SU792763370A
Authority: SU
Inventors: Богдан Михайлович Березюк; Николай Владимирович Кирианаки
Original assignee: Львовский Ордена Ленина Поли-Технический Институт
Priority date: 1979-05-07
Filing date: 1979-05-07
Publication date: 1981-03-30

Description

1one

Изобретение относитс к электроизмерительной технике и может быть использовано дл измерени одиночны временных интервалов.The invention relates to electrical measuring equipment and can be used to measure single time intervals.

Известен измеритель одиночных Временных интервалов, содержащий счетшк импульсов, генератор образцовой частоты, злементы совпадени и блоки задержки 1.A single time interval meter is known that contains pulse counts, an exemplary frequency generator, coincidence elements, and delay blocks 1.

Однако измеритель или сложен по своему устройству, или не позвол ет производить измерени с достаточно высокой точностью.However, the meter is either complex in its structure or does not allow measurements to be made with sufficiently high accuracy.

Наиболее близким к предлагаемому по технической сущности вл етс цифровой измеритель временных интервалов , содержащий генератор образцовой частоты, триггер,, ключ, реверсивный счетчик, блок собирани односекционный блок задержки, блок задержки с отводами, групповые элементы совпадени и кодопреобразователь 2 .Closest to the proposed technical entity is a digital time interval meter comprising an exemplary frequency generator, a trigger key, a reversible counter, a collection unit for a single-section delay unit, a delay unit with taps, group elements of a match, and a code converter 2.

Недостатком известного измерител вл етс довольно сложна реализаци , требующа больших аппаратурных затрат, а следовательно - низка надежность.The disadvantage of the known meter is a rather complicated implementation that requires large hardware costs, and therefore low reliability.

Цель изобретени - повышение надежности измерени .The purpose of the invention is to increase the measurement reliability.

Поставленна цель достигаетс тем, что в цифровой измеритель временных интервалов, содержащий последовательно соединенные первый элемент И, блок задержки, злементы совпадени и кодопреобразователь, а также счетчик импульсов, последовательно соединенные триггер и ключ, второй вход которого соединен с выходомThe goal is achieved by the fact that a digital time interval meter containing the first AND element in series, a delay unit, coincidence elements and a code converter, as well as a pulse counter, a trigger and a key connected in series, the second input of which is connected to the output

генератора образцовой частоты, а первый вход трнггера подключен к первому входу первого элемента И, введены второй элемент И и последовательно соединенные сумматор и третий элемент И, второй вход которого подключен к второму входу первого элемента И, при этом второй вход триггера подключен к первому входу второго элемента И, второй входgenerator of exemplary frequency, and the first input of the thrngger is connected to the first input of the first element And, the second element And serially connected adder and the third element And, the second input of which is connected to the second input of the first element And, the second input of the trigger is connected to the first input of the second element And, the second entrance

последнего соединен с выходом ключа,выход второго элемента И подключен к вторым входам 31лементс в совпадени , а выход третьего элемента И соединен с входом счетчика импульсов.the latter is connected to the output of the key, the output of the second element I is connected to the second inputs 31lements in coincidence, and the output of the third element I is connected to the input of the pulse counter.

, На чертеже приведена блок-схема цифрового измерител временных интервалов .The drawing shows a block diagram of a digital time interval meter.

Устройство содержит триггер 1 ключ 2, генератор 3 образцовой частотThe device contains a trigger 1 key 2, the generator 3 exemplary frequencies

Claims

You have a pulse counter 4, a collection block 5-7, a delay block 8, a match block 9-12, a code converter 13 and an accumulator adder 14. The device works as follows. Before starting the measurement, all the elements of the meter are reset, and all bits of counter 4 are recorded in nine (or units when working in the double number system). Impulse Start, received at the input of the meter, overturns the trigger 1, which opens the key 2, and through the block 6 enters the input of the block 8 delay. The first pulse of the generator 3 through the key 2 and the block 5 is fed to the input of the counter 4, it is set to the zero state and through the block 7 it goes to the second inputs of the element 9-12. Delayed pulse Start started at this moment at a certain output of block 8, through the corresponding element of coincidence goes to one of the inputs of the code generator 13, Fixed value of the time interval between the start pulse and the first quantizing pulse in binary or binary-decimal code from the code converter 13 enters the inputs of the accumulator 14. 14. The subsequent (N - 1) pulses of the generator 3 are summed by the counter 4, and also, at the input of the block 8 of the delay. The impulse overturns the trigger 1 to the zero state, thereby closing the key 2, and, through block 7, enters the second inputs of the elements 9-12. The last quantizing pulse, which appeared at this moment at a certain output of the delay unit 8, through the corresponding coincidence element enters one of the inputs of the code converter 13. The fixed value of the time interval b t between the last quantizing pulse arriving at the input of counter 4 and the stop pulse the transformed code is fed to the inputs of an adder which adds it to the previous code. In case of overflow, the sum of the torus is the unit from its output through block 5 is fed to the input of counter 4. The measurement process describes ts by the equation 1 Tg (N-l) + ut + flt2, where 2 is the value of the measured time interval; Tj, - value of the period of impulses of the exemplary Frequency. Thus, after the end of the measurement, in the counter 4 there will be a whole part, and in the adder 14 - a fractional part of the measurement result. Compared with the known, the proposed digital time interval meter has significant advantages. The time interval measurement process implemented in the proposed meter includes only summation operations. The absence of subtraction operations eliminates the need to use inverters in the meter for transmitting the return code to the inputs of the accumulating cum in the subtraction mode. DETAILED DESCRIPTION OF THE INVENTION A digital time interval meter comprising a serially connected first element I, a delay unit, elements of coincidence and a code converter, as well as a pulse counter, connected in series a trigger and a key, the second input of which is connected to the generator output of the reference frequency and the first trigger input connected to the first to the input of the first element I, which is based on the fact that, in order to increase reliability, the second element I and the successively connected succator and the third element I, t are entered into it whose input is connected to the second input of the first element of the AND, while the second input of the trigger is connected to the first input of the second element And, the second input of the last connected to the output of the key pulse counter input. Sources of information taken into account during the examination 1. USSR author's certificate W 472327, c.С 04 F 10 / 04.06.04.72.

2. Authors certificate of the USSR 325700, cl. H 03 K 13 / 02.10.02.70.