RU1818592C - Method for measuring ratio of amplitude of electric pulses - Google Patents

Abstract

Usage: the invention relates to an electrical measuring technique for determining the dynamic characteristics of various objects when tested for exposure to vibro-shock and explosive loads. SUMMARY OF THE INVENTION: a method for determining the ratio of the amplitudes of electric pulses, in which their amplitudes are limited at the level of the expected value, simultaneously registering them in several channels overlapping with a logarithmic step the entire range of expected amplitudes of the studied pulses, comparing them with upper and lower threshold values mi, the ratio of which is close to the optimal value of the dynamic range, count the number of channels M. containing simultaneously undistorted pulses xy and the total number of channels, containing both distorted and undistorted companion pulses N. The ratio of the amplitudes of the pulses is estimated by the formula Amax / AMii exp (2M / e.m), where e is the base of the natural logarithm; Amax. Amine is the maximum and minimum values of the amplitudes of the compared pulses, respectively. 1 ill. & 6

Description

The invention relates to electrical engineering and can be used to determine the dynamic characteristics of various objects when tested for vibration and explosive loads.

The purpose of the invention is the expansion of the amplitude range, increasing the accuracy and reliability.

The goal is achieved by registering electrical pulses simultaneously in several channels, overlapping with a logarithmic step the entire range of expected amplitudes of the studied pulses, in each channel, the studied pulses are compared with upper and lower threshold values, the ratio of which is close to the optimal value of the dynamic range ( e2 D0m S 11.6), count the number of channels M containing simultaneously studied pulses whose amplitudes are above the lower threshold and below the upper threshold (not distorted) and the total number of channels containing both distorted and undistorted compared pulses N, determine the statistical estimate by the ratio of the amplitudes of the pulses according to the formula

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eat e M /

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where e is the base of the natural logarithm;

Amaxi Amin the maximum and minimum values of the amplitudes of the compared pulses, respectively.

The drawing shows a device for measuring pulse amplitudes over a wide range.

The measurement is carried out as follows.

Suppose there are sources of pulses 1 and 2, the ratio of the amplitudes of which must be measured. A device is selected consisting of one sensor 3 and several recording channels 4-6, the absolute values of the sensitivity thresholds of which are set with a logarithmic step in such a way that they cover the entire range of expected amplitudes of the studied pulses. The studied pulses from sources 1 and 2 are fed to the input of the sensor 3 and recorded with different amplitude sensitivity simultaneously in several channels 4-6. The recorded amplitudes of the studied pulses are compared with the upper and lower threshold values, the number of channels M containing undistorted signals and the total number of channels N containing any registered signals are counted. These actions can be carried out by the operator and the introduction of a special assembly into the device is not required. As registration channels, for example, conventional waveform meters (oscilloscopes) can be used, which, like most multidimensional

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instrumentation logarithmic scales for switching sub-bands.

Claims (1)

The claims A method for determining the ratio of the amplitudes of electric pulses by limiting them in amplitude at the level of the expected value, characterized in that, in order to expand the amplitude range, improve accuracy and reliability, electric pulses are recorded simultaneously in several channels, overlapping with a logarithmic step the entire range of expected amplitudes of the studied pulses, in each channel, the studied pulses are compared with upper and lower threshold values, the ratio of which is close to optimal the value of the dynamic range e2 S Opt 11.6, the number of channels M. containing simultaneously studied pulses, the amplitudes of which are above the lower threshold and below the upper threshold (undistorted), is calculated, and the total number of channels containing both distorted and undistorted compared pulses N are determined statistical evaluation by the ratio of the amplitudes of the pulses according to the formula Amax - xn / 2-N4 Amine w where e is the base of the natural logarithm, Amax Amin - maximum and minimum amplitudes of the compared pulses, respectively.