SU697962A1 - Meter of pulse recurrence frequency fluctuations - Google Patents

Description

(54) FLOW MEASURING PERIODS OF THE FOLLOWING

PULSES

one

The invention relates to a measurement technique and can be used in digital test equipment to automatically control the statistical characteristics of pulse instability.

A device for controlling the pulse duration deviation from the specified nominal values is known, which contains two clock generators, a reference generator, an RS trigger, an AND circuit, four matching stages, a reversible decimal counter, a controlled recalculator, an anti-coincidence circuit, a reversible binary counter, and an analyzer 1.

A disadvantage of this device is that it does not allow measuring the instability of the periods of pulse following on one bus, and has a low measurement accuracy.

The closest to the present invention is a time fluctuation meter, containing a pulse shaper, a counting pulse generator, two RS flip-flops, two time-scale converters.

connected to the outputs of RS-flip-flops, a reversible binary counter, two cascades of coincidence, one of the inputs of which is connected to the output of the counting pulses generator, the others to the output of the corresponding time scale converter -; and their outputs are connected to the summing and subtracting input of the reverse binary counter, and control unit 2.

The meter has low accuracy and a narrow range of measured fluctuations.

five

The purpose of the invention is to improve the accuracy and expand the range of measurable ph.PUCTURES.

To achieve this goal, a pulse distributor, a selection driver and an adder are added to the time fluctuation meter, with the pulse distributor input and one of the driver selection selectors.

Claims (2)

5 They are connected to the output of the pulse former, the other input of the selective shaping unit is connected to the output of the counting pulse generator, the first and the first outputs of the pulse distributor are connected to the S inputs of the first and second RS triggers, respectively, the R inputs of which are connected to the output of the Schrstel form selector , the input of the control unit is connected to the inverse output of the second time scale converter; its three outputs are connected to the control inputs of the reversible counter and adder, and the information inputs of the adder connected to the outputs of the reversible counter. The drawing shows a diagram of the fluctuation of the fluctuation detector. The device contains a shaper of 1 input pulses, a distributor of 2 pulses, a selection shaper 3, a generator of 4 counting pulses, RS-triggers 5, 6, time converters 7, 8, cascades 9, 10 coincidence, reversing counter 11 , adder 12, control block 13. The principle of operation of the pulse duration fluctuation meter is as follows. The sequence of pulses under study is fed to the shaper 1 of the input pulses, which normalizes them in amplitude and duration. The normalized pulses arrive at the distributor 2 pulses, which, odd pulses, direct to their first output, and even ones to the second. Normalized pulses are also fed to the selection shaper 3, the second input of which is connected to the generator of 4 counting pulses. The selector shaper 3 transmits the nth pulse from the reference row to its output after the arrival of the calo- dal pulse of the sequence under study. The pulses from the first and second outputs of the distributor 2 pulses are received at the S-inputs of the first and second RS-flip-flops 5 and 6 and set them in one state. In the zero state, the triggers 5 and B are transferred by the output pulses of the selectorizer 3, At the direct outputs of the RS flip-flops 5 and 6, rectangular pulses are generated with a duration equal to the time interval between the pulse of the sequence under investigation and the selected n-th pulse from the reference row. The pulses from the outputs of the RS-flip-flops 5 and 6, respectively, are fed to the time scale drivers 7 and 8, which expand them by K jj times. The extended pulses are fed to one of the inputs of cascades 9 and 10 of coincidence of their channel and ensure, during MB of their influence, the passage of counting pulses T applied to the other input of each of the cascades of matches. The counting pulses from the output of the cascade 9 coincidence are fed to the counting input of the reversible binary counter 11, and the output of the output of the cascade 10 coinciding - to the subtracting input of the same counter. The output of counter 11 generates a code corresponding to the absolute instability of adjacent periods. According to the signals of control unit 13, this code is rewritten into adder 12, where information about long-term instability accumulates over t period pairs (t is an arbitrary integer), after receiving the result of the total instability for The pair of periods of the adder is zeroed, and the reset of the reversible binary counter occurs at the input after each pair of periods. The invention The pulse period fluctuation meter containing a pulse shaper, a counting pulse generator, two RS flip-flops, two time scale converters connected to the RS flip-flop outputs, a reversible counter, two stages of coincidence, one of the inputs of which is connected to the output of the counting pulse , others are connected to the output of the corresponding time scale converter, and their outputs are connected respectively to the summing and subtracting input of the reversible counter, and the control unit, which is and h and y. u and by the fact that, in order to increase the accuracy and expand the range of measured fluctuations, a pulse distributor, a selector driver and an adder are added to it, the pulse distributor input and one of the selector driver inputs are connected to the pulse generator output, another input of the pulse former connected to the output of the counting pulse generator, the first and second outputs of the pulse distributor are connected respectively to the Sr inputs of the first and second RS flip-flops, the K-inputs of which They are connected to the output of the selector driver, to the inverse output of the second inverter, the input of the control unit is connected, the three outputs of which are connected to the control inputs of the reversible counter and the adder, and the information inputs of the adder are connected to the outputs of the reversible counter. Sources of information taken into account in the examination 1, USSR Author's Certificate No. 389487, class, G 04 F 10/04, 1973. 2. USSR Author's Certificate No. 407270, class G 04 F 10/04, 1973 (prototype), X Lacoa Vyzhod