SU451962A2 - Digital meter - Google Patents

Description

one

j The invention relates to the field of automation and information-measuring technology NICKY and to be used in the automatic measurement of the frequency with the result of the measurement result in a digital code, g

suitable for entry into an electronic digital computer.

A digital frequency meter is known, containing the serially connected generator of the reference frequency, the driver of the reference frequency pulses, the key and the counters; serially connected shaper |. measured frequency pulses, a second key and a second counter, a control trigger and a matching circuit. 15

However, to determine the result of the measurement, it is necessary to perform calculations, and at the measured frequency close to the reference one, at the input of the coincidence circuit, there are packets of coincidence pulses (580 SRI) (the final duration of the i duration of coinciding pulses), which is normal. the operation of the frequency meter j The purpose of the invention is the expansion of fuchscho.) Oral capabilities, I 25

This is achieved by the fact that in the proposed frequency meter the upraising trigger has separate inputs, the first of which. Led connected to the output of the circuit, the SRI coincides, and the second to the output of the last discharge of the pulse counter of the reference frequency, the capacity of which is chosen so that it is filled in a single time interval.

The drawing shows a block .. tacmer circuit 4acTOi, where 1 is a coincidence circuit, 2 and 3 keys, 4 is a measured frequency pulse shaper, 5 is a reference frequency generator, 6 is a reference frequency shaper, 7 is a trigger, 8 and 9 are pulse counters.

The device works in the following way.

The coincidence circuit and pulse-potential keys are supplied with two pulse sequences, one with the formation of 4, which converts the input voltage frequency D, into a sequence

pulses with a repetition period T

l./J other - from the generator 5 reference .;

frequency and shaper 6 with a period

repeating "T 1 //,

".E

At the first coincidence thh psp. the measured and reference frequency circuit 1. The coincidence gives a pulse, the flip- flop trigger 7, 2 and 3 is opened and the counters of the reference and measured frequency sequence arrive in counters 8 and 9.

If the counter is used as a counter with end-to-end transfer, the capacity of which is -1, where P is the time

and forming the measurement interval, then

PG —and the impulse received at its input passes to the output of the last digit of the counter almost without delay. With this impulse, trigger 7 is transferred, keys 2 and 3 are closed.

If as the value of I- take

.AND

one-second time interval, then the number of pulses recorded in the counter 9 can be taken numerically equal to the value of the measured frequency. ; Its true value may be greater than intended by an amount of 1 / t And less than k & value depending on the duration of the coincident pulses. The relative errors in this case are correspondingly ...:

Subject invention

Digital .qacTOTOMej on author. St. No. 350167, characterized in that, in order to extend the functionality, one of the inputs of the control trigger is connected to the output of the reference frequency counter.