SU783702A1

SU783702A1 - Apparatus for measuring frequency shift from nominal value

Info

Publication number: SU783702A1
Application number: SU782585333A
Authority: SU
Inventors: Виктор Дмитриевич Аксененко
Original assignee: Предприятие П/Я В-8624
Priority date: 1978-03-01
Filing date: 1978-03-01
Publication date: 1980-11-30

Description

1one

ИэоОретение относитс к измерительной технике и может быть использовано в автоматике и вычислительной технике.The hardware is related to measurement technology and can be used in automation and computing.

Известны устройства дл измерени 5 отклонений частоты от номинального значени , содержание блок управлени , счетчик импульсов, систему ключей, генератор опорной частоты и двоичные умножители 1. .Devices are known for measuring 5 frequency deviations from a nominal value, the contents of a control unit, a pulse counter, a key system, a reference frequency generator, and binary multipliers 1..

Недостатками известных устройств .изл ютс сложность схемы и невысока надежность.The disadvantages of the known devices are the complexity of the circuit and the low reliability.

Наиболее близким техническим решением к изобретению вл етс устрой- 15 ство дл измерени отклонений частоты рт номинального значени , содержащее последовательно соединенные блок управлени , счетчик импульсов, блок инверсии и блок индикации, по- 20 следовательно соединенные первый формирователь импульсов, второй формирователь импульсов и ключ, -второй вход которого подключен к генератору образцовой частоты, второй 25 выход блока управлени подключен к второму входу второго формировател , а третий выход блока управлени соединен с вторым входом блока инверсии 2 .The closest technical solution to the invention is a device for measuring deviations of the frequency rt of the nominal value, comprising a serially connected control unit, a pulse counter, an inversion unit and a display unit, subsequently connected to the first pulse shaper, second pulse shaper and key, - the second input of which is connected to the generator of the reference frequency, the second 25 output of the control unit is connected to the second input of the second driver, and the third output of the control unit is connected to the second th inversion input unit 2.

Недостатком этого- устройства вл етс то, что при измерении частоты, меньшей -номинальной, результат измерени выдаетс с ошибкой на единицу младшего разр да.The disadvantage of this device is that when measuring the frequency, which is less than the nominal frequency, the measurement result is output with an error per unit of the least significant bit.

Цепью изобретени вл етс повышение точности измерени .The chain of the invention is to improve the measurement accuracy.

Claims

The goal is achieved in that a device for measuring frequency deviations from the nominal value, comprising a serially connected control unit, a pulse counter, an inversion unit and a display unit, serially connected to a first pulse shaper, a second pulse shaper and a switch, the second input of which is connected to an exemplary generator frequency, the second output of the control unit is connected to the second input of the second driver, and the third output of the control unit is connected to the second input of the inversion unit, ene OR gate having a first input soedinen-, exit key, its second input is connected to the third input of the inversion block and to the output of the pulse counter, and the output of OR element connected to the second input of the pulse counter. The drawing shows the block diagram of the device. The device contains serially connected first driver I pulses, second driver 2 chips, key 3, element OR 4, pulse counter 5, inversion unit 6, display unit 7, radio frequency generator 8 and control unit 9. The device works as follows. Before the beginning of the measurement, block 9 sets in the counter 5 the initial number, where G is the value of the reference frequencies; At the same time, the blk 9 causes the inversion block 6 to its initial state in which the outputs of the direct counter code 5 are connected to the input of the indication block 7. The key 3 opens with the output pulse of the driver 2 for the time when it expires at. in the counter, the number o X Af Vf f Un.A I V Km is recorded, which is counted by block 7 of the index in the forward code. At h L f ots, the number Kiji is fixed in the counter 5 and the countdown of the projevo is in the reverse code by the block b, which is measured by the transition pulse 5: zero through zero. The same impulse through the element OR 4 goes on to counter 5 and reduces the code of the number by one / thus ie At .C - V-7f where the number capacity of the counter is 5 pulses. Reducing the code by one eliminates the systematic error that occurs in the case of the device (2) when changing the indication of the direct code to the indication of the inverse code. The indication of the sign of the frequency deviation is produced by a switch that switches the keys of the unit 6. Claim of the invention A device for measuring frequency deviations from the nominal value, comprising a serially connected control unit, a pulse counter, an inversion unit and a display unit, serially connected to the first pulse shaper, second pulse shaper and key the second input of which is connected to the generator of the reference frequency, the second output of the control unit is connected to the second input of the second shaper, and tert The output of the control unit is connected to the second hole of the inversion unit, characterized in that, in order to improve the measurement accuracy, an OR element is entered into it, the first input of which is connected to the output of the key, its second input is connected to the third input of the inversion unit and to the output of the pulse counter , and the output of the element OR is connected to the second input of the pulse counter. Sources of information taken into account during the examination 1. The author's certificate of the USSR G 364095, cl H 03 K 13/20, 1971.

2. USSR author's certificate I 336612, class C 01 R 23/10,.