SU1525606A1 - Device for measuring divergence of periods of two generators with close frequencies - Google Patents

Abstract

The invention relates to electrical measuring equipment and can be used in pulse systems for measuring the difference in the periods (frequencies) of pulse generators or sensors. The aim of the invention is to simplify the device and reduce the measurement error. The device contains two pulse oscillators 1 and 2, shapers 3 and 4 pulses, a logical element And 5, a binary counter 6, a semiconductor time relay 7, a delay element 8. The proposed device, in comparison with the prototype, provides higher accuracy of the performed measurements. 2 Il.

Description

one

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01

yu bi

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I The invention relates to an ectro "(energy technology and can be used in impulse systems. L measuring the divergence of periods (hours from) of impulse generators or daters.

The purpose of the invention is to simplify the mouth of the E | oystva and reduce the error of change.

Figure 1 shows a diagram of a predictable device, figure 2 - im- 1 pulse diagram.

The device (Fig. 1) contains two 1-pulse generators 1 and 2. Generator outputs 1 and 2 through the driver

and 4 pulses are connected to the inputs of a cohesive element I 5, the output of which is connected to the counting input of the double counter 6. The output of the element I is also connected to a semiconductor time relay 7, the output of which is connected to the input c; throwing the counter 6 and to the inputs control of logic circuit 9,

The device works as follows: | Brazom (Fig. 2).

Generators 1 and 2 generate im- iffynbcbi with frequencies

l / Tj, with f

f, and 1 / T and f,

m

“F.

and accordingly

T,: st Tg. Formers 3 and 4 form the signals of the generators

and 2 pulses (Fig. 2) are strictly constant

Howl of duration t, and in principle, as well as a logical element lie, the duration is possible for 35 formers 3 and 4, i.e. t const and t const. These pulses arrive at the inputs of the element And 5, and the output of which signal takes place in the case of the mutual overlap of the input signals 40 of Fig. 2). In this case, at the output of the element | i 5, the pulses appear in groups, and the number of pulses in each Group (Fig. 2) is proportional to the sum of Durations t + t and back pro 45 is valid for the divergence of the periods & T | T, -T2 |, i.e.

Both a binary counter, characterized by the fact that, in order to reduce measurement error, a time relay, a delay element, a logic circuit are introduced in it, and the outputs of the pulse formers are connected to the inputs of the logic element I, the output of which is connected to the counting input of the binary counter and the time relay input, the output of which is connected via a delay element to the reset input of the counter and the control input of the logic circuit; the output of which is connected to the output of the device, and the outputs of the binary counter are connected to the information inputs nical scheme.

t n

+ & T

II tn

0

0

and in the particular case at t t

we have Ng.

I. ,, .

Thus, if counter 6 is reset beforehand, then it will record the number Ng, inversely proportional to the divergence of the AT periods. It is important that the smaller this discrepancy is 1, the more accurately it will be measured. At the end of the group of impulses of imposition at the output of the AND 5 element, the semiconductor time relay 7 triggers, which has a delay of f T, where 5 t is the largest possible value of T and T. Relay 7 includes a census of the contents of counter 6, i.e. Ng, from the device through the AND 9 circuit. After that, through the delay element 8, the counter 6 is reset, after reset, the device is prepared to measure the number of pulses and the next group of overlap pulses from the output of the And 5 element.

Claims (1)

Invention Formula  A device for measuring the divergence of the periods of two pulse generators with similar frequencies, containing two pulse generators, each of which is connected to the inputs of the corresponding drivers 5 0 pulses as well as a logical element And a binary counter, characterized in that, in order to reduce the measurement error, a time relay, a delay element, a logic circuit are introduced in it, with the outputs of pulse drivers connected to the inputs of the logic element I, the output of which is connected to the counting input of the binary counter and the input of the relay time, the output of which through the delay element is connected to the reset input of the counter and the control input of the logic circuit; the output of which is connected to the output of the device, and the outputs of the binary counter are connected to the information inputs of the log general scheme. tL 3 - Jl tJTJLJUUlJlJUUUUL Yy t iV 72. OJLJLJLfUUUUL I В I П n П П П I I FI.2