SU635435A1 - Arrangement for measuring the differential of two time intervals - Google Patents

Description

one

The invention relates to the field of measurement technology and can be used, for example, when measuring the non-uniformity of the shaft rotation speed. In this case, the problem arises of measuring the difference between two successive time intervals generated by pulses from the shaft rotation frequency sensor.

A device for measuring the period difference of two electrical signals is known, which contains pulse drivers, counters of the number of input and reference frequency periods, a reference frequency generator, pulse-potential gates, zero-state decoders of counters of the number of input signal periods, triggers, cascades of coincidence, inverters, assembly circuit Ziak indicators, reversible counter and assembly circuit 1. However, this device allows to measure the difference in time intervals only when signals are present at both his inputs.

A device is known for determining the difference in pulses between two pulse sequences, comprising reversible and summing counters, a zero decoder and an anti-matching circuit 2.

This device allows you to determine the difference of two time intervals, if

These intervals are represented by the IlMpulse sequences, in which the pulses follow with some definite frequency, and the number of them is iioriн nally to the length of the corresponding time interval. The disadvantage of the device is that it is necessary to provide preliminary information about the ratio of the number of lacquers in the emulsion and sequential ratios in order to iodine each of them to the corresponding input of the device.

The purpose of the invention is to expand the functional capabilities of the device - to ensure the possibility of measuring the spacing of two time intervals, if there is an irregular and unevenness of their ratio.

Claims (2)

The goal is achieved by the fact that a device for measuring two time intervals containing the main reversible counter and a multiple input zero-state identification element, whose inputs are connected to the outputs of the main reversible counter, has been added an additional reversible counter and a character trigger, and subtracting the input of the additional reversible counter connected to the summing input of an axis reversible counter, the total is a lean input of an additional reversing counter connected to the subtractive the input of the main reversible counter, and the output of the multi-input element of the identification of the zero state is connected to the installation input of the sign trigger. The drawing shows the block diagram of the proposed device. The device contains main and additional reversible counters 1 and 2, respectively, a multi-input element 3 for identifying the zero state and a trigger 4 characters, the first input 5 of the device is connected to the subtracting input 6 of the main reversing counter 1 and the summing input 7 of the additional reversible counter 2, and the second input 8 the device is connected to the summing input 9 of the main reversing counter 1 and the subtractive input 10 of the additional reversing counter 2, the outputs of which are connected to the multi-input element 3 identifiable Vani state zero, the output multi-input AND element 3 is connected to the mounting plate 4 Valid Trigger. The proposed device works as follows. Before the start of measurement by impulse along the splint. Reset the reversible counters 1 and 2 and the trigger 4 characters are reset. Then, a pulse sequence encoding the first time interval is supplied to the first input 5 of the device. The pulses of this sequence are fed to the subtracting input 6 of the reversing counter 1 and to the summing input 7 of the reversing counter 2. At the end of this pulse sequence, the direct code of the first time interval will be recorded in the reversing counter 2, and the additional code of this interval in the reverse counter 1 A second device input 6 is supplied with a pulse sequence encoding a second time interval. In this case, three variants of the ratio of the number of pulses NI and in pulse sequences are possible. When the measurement process is completed, the following results are present in the reversible counters 1 and 2: the reversing counter 2 records the direct code of the difference in the number of pulses in two pulse sequences, and the reversible counter 1 contains the additional code of this difference. In this case, in the process of measurement, the reversible counter 2 is not set to a bullet state and the multi-input element 3 of the identification of the zero state does not change the initial state of the trigger 4 characters. As a result, the signal "1 at the inverse output of the sign trigger indicates that the difference of two successive time intervals has the sign" +, and its direct code is stored in the reversing counter 2. With Ni, N2, after the measurement process ends reversible counters 1 and 2 have the following results: in reversible counter 1, the direct code of the difference in the number of pulses in two pulse sequences is written, and in the reversible counter 2 - the additional code of this difference. In the process of measurement, the reversible counter 2 at the time of equality of the number of pulses received at subtracting input 10, the number of pulses received at summing input 7 (L) is set to the state O and the multi-input element 3 identifying the bullet state changes the initial state trigger trigger 4 characters. As a result, the signal "1 at the forward output of the sign trigger indicates that the difference of the two time intervals has the sign" -, and the direct code of it is stored in the reversible counter 1. With Ni N2 after the end of the measurement process in both reversible counters 1 and 2 write codes zero. At the same time, the following:, the output of the 4-character trigger, the signal "I" is present, by which the difference code is read from the outputs of the reversible counter 1. By describing the principle of the proposed device, it is clear that the introduction of an additional reversible counter and the sign trigger allowed the functionality of the known device to be expanded an account of the possibility of measuring the difference of two time intervals with a priori uncertainty of their ratio. Apparatus of the Invention A device for measuring the difference of two time intervals, containing a main reversible counter and a miogovodny element for identifying the zero state, the inputs of which are connected to the outputs of the main reversing counter, characterized in that, in order to expand the functionality of the device, it is additionally introduced a reversible counter and trigger the sign, the input of the donor reverse counter is connected to the summing input of the axis reversible counter, the summing input is up to The additional reversible counter is connected to the subtracting inlet of the main reversible counter, and the output of the miohodovy element identifying the zero state is connected to the set input of the sign trigger. Sources of information taken into account in the examination 1. USSR author's certificate ° 257547, cl. OZK 3/00, 08.24.68. 2. USSR author's certificate L 271579, cl. S OZK 5/00, 17.12.68.  +