SU409149A1 - DIGITAL FREQUENCY - Google Patents

Description

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Invention is attributed to the field of electrical measuring equipment.

Plasma digital frequency meter contains a reference frequency generator, pulse shapers of the reference and measured frequencies, a key, a control trigger, a coincidence circuit and pulse counters of the reference and measured frequencies.

The proposed frequency meter differs from the known ones in that it is equipped with a frequency splitter, and the trigger is executed with separate inputs, the first of which is the keys to the output of the sovnadeia circuit and the input.divider of the frequency divider, the second to the output of the frequency frequency and the output Wirall ui. igm inputs of the first and second keys.

Such a device allows for improved measurement accuracy.

The block diagram of the frequency meter shown in the drawing.

The digital frequency meter consists of a circuit / sovnadeii; keys 2 and 3; shapers 4 and 5 pulses; geeerator 6 imiulsov; trigger 7 control; counters 8 and 9 pulses and divider 10 frequency of coincidence.

The device works as follows.

The scheme / soviadeia and keys 2 and 3 are supplied with two and sequences of imiuls, one with a forg. Driver 4, which converts the input voltage of frequency f x a pulse sequence with a period of an Ivtor, and another from the generator.

  f. Pulse of reference frequency and shaper

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and imiulsov with iriodom repetition 1 - --- g-

When the same match of the impulse of unknown frequency with the standard frequency impulse, the soviadeia scheme will output a terminal at one thrunger input 7 equalized, opening keys 2 and 3.

Through a public key, both pulse trainings are passed correspondingly to counters 8 and 9. The second and the next, and no coincidence, cannot knock back the trigger, since they fall on the same input. All coincidences arrive at delntel 10 coincidence frequencies, of course, in the form of a counter. When the counter is ireannured, the immiuls from its output is fed to the second input of the control trigger, which closes keys 2 and 3.

The number of pulses, counted as counters. S and 9, respectively

And x KT., / L e KT c /.

where Gn is the average time between the bunks of soviadias;

frequency dividing rate

K - matches.

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Obviously, the RHc depending on the time between the first and / V-M coincidences, the ratio of the Kni3iiecTi oi i frequency to the reference frequency remains a definitive POMIiiiiioii. This same Ist. Vepp. Rappo and otopikmiyu codes, fixed nainihix sozstv.schlyu n p1s1shnyakh 8 and 9

T f.

from / X

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Г1 рддм от and 3 a b t a r p e n I Digital frequency meter containing the geerator of the reference frequency, the formers of the pulses of the reference and measured frequencies, keys, control trigger5, soviadennny circuit. and counters and :; The pulses are standard and measurable frequencies, characterized in that, in order to improve accuracy, it is equipped with a coincidence frequency divider, the control trigger 1 is configured with separate inputs, the nerve of which is connected to the output of the matching circuit and the input of the frequency divider, the second - to the output; , and the output is to wirall yppm inputs of the second and second keys.

in WSCM

3 CL