SU788016A1 - Digital frequency meter - Google Patents

Description

; 54) DIGITAL FREQUENCY

The invention relates to information and measurement techniques and can be used to measure the average frequency value. A digital frequency meter is known, which contains a standard frequency generator, standard frequency drivers and frequency measurement drivers, trigger, pulse potential key and counters 1. A disadvantage of this device is that the relative measurement error for different frequencies is not the same. The closest in its technical essence to the proposed module is a digital frequency meter containing serially connected standard frequency generator, standard frequency pulse shaper, coincidence element, trigger, first potential-potential pulse, the second input of which is connected to standard frequency pulse forwarder, and output the input of the first counter, as well as the pulse shaper of the measured frequency, the output of which is connected to the second input of the coincidence element and to the input of the second transducer lsno-candidate key, a second input coupled to an output of the flip-flop, and the output to the input of the second counter, the third pulse-candidate key, the first input of which is connected to the output of matching element, the second input to the output of the first counter as well. output to the second input of the trigger 2. A disadvantage of the known device is that as the frequency range increases, the information redundancy increases. The purpose of the invention is to expand the measurement range. This goal is achieved by the fact that a digital frequency meter containing series-connected standard-frequency oscillator and the main standard-frequency pulse shaper, serially connected to the main coincidence element, is basic. the trigger, the first pulse-potential key and the first counter, as well as the pulse shaper of the measured frequency, the output of which is connected to the first input of the main coincidence element and to the input of the second pulse-dongle key, the second input of which is connected to the output of the main

trigger, and the output with the input of the second counter, impulse potential key, the first input of which is connected to the output of the main element of the match, and the output with the input of the main trigger, additionally entered 3p matching elements, two assemblies in-1) additional triggers, trigger evaluation and (p-1) additional pulse shapers of standard frequency, while the standard frequency generator, the main and additional shaper drives are connected to the inputs of additional pulse shapers of standard frequency With the corresponding first n matching elements and the first assembly unit are connected to the second input of the first key and the main matching element, the first inputs of the first counter are connected through the corresponding second n matching elements and the second assembly unit to the second input of the third key, the second outputs of the first counter through the corresponding third (n-1) the coincidence elements are connected to the corresponding additional triggers, the output of the evaluation trigger, the input of which is connected to the second, is connected to the second inputs of the third (p-1) elements during the second key, the first outputs of all flip-flops are connected via an Sn-th element of coincidence with the second input of one of the first to n and one of the second coincidence n elements, the remaining inputs of the first and second n n coincidence elements connected to respective outputs of respective additional triggers.

The drawing shows a block diagram of the device.

The digital frequency meter contains a standard frequency generator 1, a main driver 2 pulses of a standard frequency, additional drivers 3, -3) pulses of a standard frequency, a driver 4 pulses of the measured frequency, first elements, matches, second elements 6.j-6j, matches, third elements matches, main element 3 matches, Zn-th element 9 matches, first and second blocks 10 and 11 of the assembly, first, second and third pulse-potential keys 12, 13 14 main trigger 15, trigger trigger 16, additional triggers 17- (, the first counter 18 and the second counter 19.

The device works as follows. Forms - spruces 2 and 3, | -3y convert the sinusoidal voltage of the generator 1 of the standard frequency in a sequence of pulses with a period of time T (- with durations

: G2. . With (,, that come on

-V

inputs to the J of the first elements 5 - (- 5p. Shaper 4 pulses

pulses with r; er 1 is the next T 11, and with duration Hz,;,; e do not come to the second impulse-potential KEY 13 connected to the second counter 19 and to the mouth input (-; 1 1 trigger 16 of the estimate.

The first counter 18 has outputs.

according to: cie counting P, P y,. . .R

n pulses, and P ----, and time

 -tT

-.

measuring t ,,

where is c)

4C

(f c

relative value

stability

standard frequency.

In addition, the counter 18 IMS

Dh

from oo t to e st u uuigi t

N. ,,, pulses,

A -, A

BUT.

N

IriiM

T,

where fh-, a- / pig. maximum 5, and that measured by the device;

A, (, ... A - multiplicity coefficients are relative to the relative error values for the maximum and minimum frequencies of the subbands, corresponding to the first time intervals., T

H (# 1

and i mch

The first elements 5, -5 y, are controlled by additional triggers, the one-unit outputs of the triggers are connected respectively to the elements 5t-5c, the zero outputs of the triggers 7, .- 1 - respectively to the element-sh, and the zero outputs of all the triggers through Zn- element 9 match

In a similar way, additional triggers control and repeats. The first and second elements, whose inputs are connected to the outputs of the first counter 18, corresponding to the time intervals H, -, go out through the second assembly unit 10 and the third needle-potential cell: the main trigger input 15. To the second inputs of the main trigger 15 and the key 14, the main coincidence element 8 is connected.

The outputs of the elements 5.-5U, connected through the first block 9 of the Assembly with the first input of the main element 8 match, and through the first impulse-ready key 12 with the first counter 18.

The outputs of the first counter 18, corresponding to the counting codes

Comm .: 7s and 7s with third elements (coincidence, the second inputs of which are connected to the output O of the evaluation trigger 16, and the outputs to the inputs of installation 1, respectively, of the triggers (-, In the initial state, through the first element 5, the pulses of the minimum duration After the first match and flip of the main trnger 15. keys 12 and 13 open and start counting pulses in counters, 18 and 19. If the duration of year 1 is shorter than the time interval N due to flip of the trigger 16, ea I cover :; its third elements ,,, none of the additional triggers are subsequently transferred, i.e., the first time base t and M1 are used for the minimum pulse width of the standard frequency. We have T.) For all frequencies, the relative measurement error (. redundancy Information in the worst case is determined by the value - where, where the maximum error of resolution in the range: 2T moi tu-ygll GSL AlVYi-.r, Tc, ti is the average interval between coincidence of the frequency pulses f and f rn-in 2g. i €, v With a duration of TU, shorter than the interval T, there is a sequential reversal of the flip-flops 17.-17, switching the time intervals and the duration of the pulses before the first pulse of the measured frequency arrives at the trigger 16. In this case, the transfer is completed and the time base tti) 1 is used. The duration of the ikotulses is tr.,. At the end of the time interval tj T OTKpHBaeTCH, the third and: a potential potential key 14 and the first coincidence of a pulse with a standard frequency and a pulse of a measured frequency cause the main trigger 15 to drop and the counting stops. The value of f. Is found from the dependencies of k and m - codes recorded by counters 18 and 19, respectively. Thus, the proposed device allows to significantly expand the range of measured frequencies while maintaining the minimum information redundancy. invention Digital frequency meter containing serially connected standard clock and with noemo ;; i + i-;: worldsizer pulses hundred: ;; IF mr;; -; frequencies, consecutively connected main match-ani ;; , trigger trigger, first. to: p.,: lsns-potential1 key and the first cross section - ;; к, and tgl-g-ke the driver.: c C-OR at the frequency, the output of which is connected to the first input . m oCiCEHoro fall and with the entrance of the second; potential; the second key, the second input of which is connected to the output of the main trigger, and the output to the input of the second counter, the third multiply bCiio potential; the second key, the nepBiiiii input of which is connected to the output of the S1Uv; -: w; from the main pipe: and: the worm, about the first and the second with the fact that, for the sake of, the measurement range, it is additionally introduced Cp matching elements, two assemblies of additional triggers, assessment trigger ii (additional foririrovatel ir-pulses standard iOh frequency, with additional inputs to the inputs pulse hubs; standard h; stacks of the switched on generator; stl; frequency frequency; the outputs of the main and additional drivers through the first first matching elements and the first assembly unit are connected to the second inputs of the first key and the main element of the master unit; - passed through the corresponding1; second matching n elements of the match and the second assembly unit to the BTOpo ii input of the third key; the second outputs of the first counter through the corresponding third (n − 1) matching elements are connected to the corresponding Instances: 1 additional: it is triggers, to the second input i of the third (p-1) match elements is connected to the evaluation trigger trigger, the input of which is connected to the output of the second key, the first outputs of all trigger triggers (overlap of the second match the input of one of the first n and one of the second r, the elements of the match, the inputs of the remaining first n and the second n elements of the match are connected to the corresponding outputs of the corresponding additional triggers. Sources of information taken into account during the examination 1.Ornatsky P. P. LVTO; -, atomic measurements and devices. K., High School, 1971, p. 394. 2.Avtorskoe svidete.chstvo USSR for application number 2011871, 09/06/76.

Claims (1)

Claim A digital frequency meter containing 55 series-connected standard-frequency oscillators and, again, a pulse generator of standard frequency, series-connected main coincidence element, main trigger, first pulse-potential switch and the first counters, as well as a pulse generator of measured frequency, the output of which is connected to the first input the main element of coincidence with the input of the second pulse-potential key, the second input of which is connected to the output of the main trigger, and the output to the input of the second counter, the third pulse-potential switch, the first input of which is connected to the output of the main coincidence element, and the output to the input of the main trigger, with the exception that, in order to expand the measuring range, it additionally Zn of coincidence elements, two assembly blocks (p-1) of additional triggers, an evaluation trigger and (p-1) of additional standard frequency pulse shapers are introduced, while a standard frequency generator is connected to the inputs of additional standard frequency pulse shapers, the outputs of the main and additional shapers through the corresponding first n matching elements and the first assembly block are connected to the second inputs of the first key and the main matching element, the first inputs of the first counter are connected through the corresponding second n matching elements and the second assembly block to the second input of the third key, the second outputs of the first counter through the corresponding third (n-1) coincidence elements are connected to the corresponding additional triggers, to the second inputs! of the third (n-1) coincidence elements, the output of the evaluation trigger is connected, the input of which is connected to the output of the second key, the first outputs of all the triggers are connected through the 3rd element of coincidence with the second input of one of the first n and one of the second about the coincidence elements, the inputs of the remaining first n and second and coincidence elements are connected to the corresponding outputs of the corresponding additional triggers.