SU718802A1

SU718802A1 - Phase calibrator

Info

Publication number: SU718802A1
Application number: SU782625180A
Authority: SU
Inventors: Любомир Александрович Коваль; Петр Маркиянович Сопрунюк; Владимир Степанович Цыбульский
Original assignee: Физико-Механический Институт Ан Украинской Сср
Priority date: 1978-05-25
Filing date: 1978-05-25
Publication date: 1980-02-29

Description

1one

Изобретение относитс к области измерительной техники и можег быть использовано при разработке измерительной аппаратуры в диапазоне низких и инфранизких частот.The invention relates to the field of measurement technology and can be used in the development of measuring equipment in the range of low and infra-low frequencies.

Известен фазовый калибратор, в котором имеетс задающий генератор, нагруженный на два делител частоты, один из которых снабжен схемой установки фазового сдвига , причем выходы делителей частоты подключены ко входам устройств синтезирующих квазисинусоидальные напр жени из напр жений пр моугольной формы, снимаемых с делителей частоты ,1.A phase calibrator is known in which there is a master oscillator loaded on two frequency dividers, one of which is equipped with a phase shift setting circuit, and the outputs of frequency dividers are connected to the inputs of devices synthesizing quasi-sinusoidal voltages from square voltages taken from frequency dividers, 1 .

Недостатком такого фазового калибратора вл етс несинусоидальность выходных напр жений, причем по мере приближени их формы к синусоидальной возрастают аппаратурные затраты.The disadvantage of such a phase calibrator is the non-sinusoidal output voltages, and as their shape approaches a sinusoidal, instrumental costs increase.

Известен также фазовый калибратор, вл ющийс прецизионным двухфазным генератором инфранизких частот, содержащий задающий генератор, нагруженный на два канала, каждый из которых составлен из последовательно соединенных фазовращател , делител частоты, фильтра первой гармоники и смесител с фильтром нижних частот на выходе и перестраиваемый генератор пр моугольных импульсов (плавныйAlso known is a phase calibrator, which is a precision two-phase infra-low frequency generator, containing a master oscillator loaded on two channels, each of which is composed of series-connected phase shifters, a frequency divider, a first harmonic filter, and a mixer with a low-pass filter at the output and a tunable rectangular generator pulses (smooth

гетеродин), выход которого подключен к другим входам смесителей {2.local oscillator), the output of which is connected to other inputs of mixers {2.

Двухфазный генератор содержит фазоиндикатор нул , два электромеханических фазовращател , два прецизионных фильтра первой гармоники, причем каждый из этих элементов определ ет точность установки фазового сдвига между выходными сигналами .The two-phase generator contains a zero phase indicator, two electromechanical phase shifters, two first harmonic precision filters, each of these elements determining the accuracy of setting the phase shift between the output signals.

Claims

The aim of the invention is to increase the reliability of the device. The goal is achieved in that a device containing a master oscillator and two channels, each of which consists of a series-connected frequency divider, a mixer and a low-pass filter connected by an output to the output terminal of the calibrator, as well as a tunable pulse generator connected to the master oscillator, is entered the logical element OR, one of the inputs of which is connected to the output of the master oscillator, and the other through the input delay line with the output of a tunable pulse generator, the output of the element OR connected to the inputs of the frequency dividers of the first and second channels, one of the frequency dividers provided with a phase shift control unit, the outputs of which are connected to the installation inputs of the first divider, and the input to the output of the second frequency divider, while the other inputs of the mixers are connected to the output of the master oscillator through Introduced first harmonic filter and additional frequency divider. The drawing shows a block diagram of a phase calibrator. It contains master oscillator 1, frequency dividers 2, 3, and 4, mixers 5 and 6, first harmonic filter 7, low pass filters 8 and 9, tunable pulse generator 10, delay line 11, element OR 12, and phase shift control unit 13. The calibrator works as follows. The inputs of frequency dividers 2 and 3 through the element OR 12 receive pulses of the master oscillator 1 with frequency F. The same pulses are fed to the input of frequency divider 4. The division ratio of dividers 2, 3 and 4 is the same and equal to N. The output of frequency divider 4 will be there are rectangular oscillations with a frequency -, the first harmonic of which is extracted by filter 7. At the outputs of frequency dividers 2 and 3, frequency oscillations occur where g is the frequency of the output oscillations of the pulse generator 10, due to the supply of additional pulses from the pulse generator through element OR 12. At the outputs of mixers 5 and 6, filters of the lowest frequencies 8 and 9 emit oscillations of the difference frequency F + - frn / - gN Thus, by increasing L and decreasing the value of P, you can get an arbitrarily low frequency of output oscillations. The delay line And prevents the coincidence of the pulses at the outputs of the element OR. The phase shift between the output vibrations of the calibrator is determined by the time shift of the pulse sequences at the outputs of frequency dividers 2 and 3, which depends on the current difference of codes recorded in the digits of dividers 2 and 3. If at the time when divider 3 has all the bits TC in the zero state, the phase shift between the output oscillations will be determined by the ratio: cf - 360 °. By changing the number n in the range from O to L, the output phase shift can be changed from O to 360 °. The required number p is written using the phase shift control unit 13. The resolution of the phase shift setting is determined by the frequency divider size and is equal to 360 ° / L. Thus, the calibrator allows the generation of sinusoidal oscillations of low and infra-low frequencies with predetermined frequency and phase shift. The technical efficiency of the calibrator lies in the fact that it is thicker than the known, since it lacks the phase indicator zero, as well as the graduated and nongraded phase shifters. The absence of these elements also leads to an increase in the notandial accuracy of similar devices and to the simplification of the installation of a given phase shift. The latter circumstance is especially important, since it makes it possible to use the proposed phase calibrator in automatic instruments, for example, in casing phase meters as a source of compensating voltages. The invention includes a phase calibrator comprising a master oscillator and two channels, each of which consists of a series-connected frequency divider, a mixer and a low-pass filter connected by an output to the calibrator output terminal, as well as a tunable pulse generator connected to the master oscillator, characterized in , in order to increase reliability, an OR element is introduced into it, one of the inputs of which is connected to the output of the master oscillator, and the other through the input delay line to the output of the rebuilding pulse generator, the output element OR is connected to the inputs of the frequency dividers of the first and second channels, and one of the frequency dividers is equipped with a phase shift control unit, the outputs of which are connected to the installation inputs of the first frequency divider, and the input is connected to the output of the third frequency divider, while the others The mixer moves are connected via the first harmonic filter and an additional frequency divider to the output of the generator. Sources of information taken into account in the examination 1. USSR author's certificate 434332, cl. G 01 R 25/04, 1972.

2. Journal "Measuring equipment, 9, 1966, p. 61-64.