SU402818A1 - DIGITAL FREQUENCY - Google Patents

Description

The invention relates to the field of electrical engineering and technical literature.

The well-known Digital frequency meter containing a reversible counter, a divider of the reference frequency, a set of schema matching and a collecting circuit, a teaser; pontiffs, and, of course, butt and bystradiance, constricted by the func tional function, he is also able to stop the pulsations out of the frequency and get multiplied is the input frequency.

The proposed frequency meter for improving accuracy and speed, as well as expanding the functional capabilities, provides memory registers whose inputs are connected to the outputs of the roar & counters, outputs with the entrances of pend-offs, and the control code access with the output reference frequency divider.

To determine the result of the measured frequency measured frequency, the frequency meter is equipped with triggers and a switch, the output of which is connected to the control input of the write register memory code, the input to the source modulating the measured frequency, and the first input of the trigger, the second (the swarm input of which is connected to the output of the reference frequency divider, and the output to the control 1, the input of the key.

 In addition, the proposed frequency meter is equipped with) L and a key, the output of which is connected to the input of the control by writing the memory register code; ti, the input — to the input terminal, the higher bits of the reversible counter, and

nerves.the input of the trntger, the second input of which is a switch} to the output of the reference frequency divider, and the output to the control input of the key, which allows you to increase the speed and ensure that the xy oi frequency is received.

Ma FIG. 1 is shown in block diagram of a rollout device: FIG. 2 is a block diagram with additional memory; 1 key and Trigger.m; i: a fng 3 is a block diagram of the device, a loop for getting the same frequency of the input frequency.

The device consists of a reversible counter /, a reference frequency divider 2, a set of coincidence circuits (“I” cells 3), and a collection of

(“OR” cells) 4; register ia, mi 5 with input 6 of control, code, key 7 and trigger 8.

The device, the block diagram of which is shown in Figure 1a and FIG. 1,; works as follows.

The input frequency / g is supplied by the summation of the Huni input of the reversible counter.a /. The feedback input of this counter enters the return frequency, which is obtained from the output of the multiplier formed by the counter .. m /, div: t of the frequency of 2 frequencies, and-OR 3,

4. Frequency (at the arbitrary moment), aremania is determined by raw

 / 0

iV max

where Ai is ico-d, registered in register 5; Luchaks - (Divisor 2 recalculation coefficient equal to the maximum capacity of the counter J. Time Hra, several data in register 5 until its next record; records from the counter / equal to the period T Impulses, nocTvaaioutHx lia input 6 regMStra 5. For time 7 -. zp1ka} chyvaets

/about

transition; npoiuecc l-frequency meter.

In the device, in the circuit of which donor gut 0, the key 7 and the trigger 8 (fig. 2) are included, the input 6 of the register 5 through the key 7 iodine m pulses m from the source H: I: ka sk: drove, ms-dul. The key 7 is controlled by the drivers 8, to one installation input - which is supplied by It: frequency pulses / m, and the other - impulses from the output of divider 2. With a pulse of alternate n-m-null from you. Had divider 2 triggers trigger 8 It opens 7. The first thing after this is also: h; ny, if frequency j-- G1) passes by - to input 6 of register 5 and does the code rewrite from counter 1 - to register 5. This same back-front impulse ol-rolls over ep 8 -n-ov closes k; poch 7. Next time key 7 will be opened only then ivoivta on tmmter 8 a NEW impulse will come from the output div1it l 2.

As a result, with a minimum time of T inter1D: for two- (by census pulses, on average, a budge is equal to a period of two times, which is about; pulses from divisor 2, i.e., c.

bakes high speed iri; boron; On the other hand, the exact time of time 7 will always be a multiple of the integer number of the heterodes of the SIGIAL interference, which excludes the effect of this interference and the recognition of the code in the RSL 5.

Quaity error is measured; The frequency is reduced by the Lp and the construction of the device according to the scheme, and in Fig. 3

In this frequency meter, the synchronization time T is produced exactly the same as in the frequency meter, shown in FIG. 2, the input of the sync is live. Here the frequency pulses / L are iodine. In order to increase the measurement accuracy when: a small number of pulses f., - are attached to the T & T period, the pulses f, are directly fed to the input of one or more of the most significant bits of the counter /. In this case, there is one impulse that comes to the most senior. Discharge counts | Ica, equivalent to v imtems, coming to the input counts: -Ka, where t is the coefficient of

parts of the counter that are suitable for the highest bit.

Increased and / o can produce an exact mea- sure of frequency /.v in the limit for one or several of its periods. By increasing

Frequencies fr tp: And l1p 8 and switch 7 change the number of periods of this frequency during which one measurement is performed. Frequency (see Fig. 3) allows to obtain a multiplied value of the input frequency. 71, l of this variation of the device we have

/ oc - m- / v.

The measurement result in the frequency meter is shown. IOM Ilia FIG. 3 is read from register 5.

Г ip с д Л1 эт II 3 о б-р е т с i. -and

; Digital frequency frequencies containing; -reversi; iy account-and-gk, divisor) Opo-ph-oh part, a set of matching schemes and a collecting chain,

characterized by the fact that, with an increase in speed and speed, as well as expansion of the fuzzing characteristics, it is equipped with a memory register, whose inputs are connected to the outputs of the reversible counter, the outputs are with the inputs the control input of the code record with the output of the internal frequency.

2. The frequency meter according to claim 1, wherein

that, in order to eliminate the effect on the measurement result of the pulsatile frequency being measured, it is supplied. trig-hero.m and a key, the output of which is connected to the input of the hiravle ;; :) recording the register code, input - with the source of the signal that modulates the frequency, and the first input of the Tpiirrepa, the second input of which is connected to the output the divider is the operating frequency, and the output is to the control input of the key. 3 Frequency meter no. 1, characterized in that, in order to increase speed and obtain an input frequency value, it is equipped with a trigger and key: m, the output of which is connected to the control input

the perHCTpia code of the memory, the input with the input terminal, the first bits of the reversible counter and the first input of the trigger, the second input of which is connected to the output of the reference frequency divider, and the output to the control input of the key.

Fig 1

M

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