SU106143A1 - A method of measuring the ratio of the amplitudes of a voltage of two or several pulses of exponential or bell shape - Google Patents

Description

-1-way methods of measuring current and pulse amplitudes give low accuracy especially in a wide dynamic range and are not suitable for the case when both pulses act alternately on the same channel.

To eliminate these drawbacks, the prior; 1 step is. The desired ratio of the amplitudes of the pulses is determined from the difference in the number of oscillations of the catenated oscillator, switched on by the front and off by the falling edges of each amplitude measured pulse.

In the drawing there is a representation of a block of the device, which serves for the installation of the proposed method.

The measured impulses on the necessary amplification in the amplifier Y are limited in amplitude by the maximum in the limiter O, and then differentiated in the differentiating device D. The differentiated pulses are controlled by a calibrated generator

Part 1 1 / so that the front edge of each measured pulse unlocks the generator, and the rear edge closes it. The switchgear P., which is a conventional binary recalculation cascade, sends alternately pairs of pulses obtained by differentiating the measured signals to counters Ci and Cz for unlocking or locking them. The counters record the number of pulses generated by the generator during the passage through the circuit of the corresponding measured pulses.

The generator pulses difference recorded by the counters Ci and € 2 for the measured and pulses of exponential form is proportional to the logarithm of the ratio of their amplitudes and is calculated by the formula:

U,

mi

dfl, t2 exciopent

pulse constant; generator frequency;

  amplitude of measured pulses;

Nj, N., the number of generator pulses, registered counters Ci and C ,.

For bell-shaped pulses, the counting is performed on a different {) 0mu.1e:

Hg x .. 111

Since all measured pulses pass through the same channel, the measurement accuracy is determined mainly by the frequency of the crystal oscillator and the stability of the scaling circuit.

The proposed method can be applied for logometry of both single and periodical pulses.

Preface i c o b) e te n u

The method of measuring the ratio of the amplitudes of the voltage of two or several pulses of exponential or bell shape that are not aligned in time, characterized in that, in order to improve the measurement accuracy in a wide dynamic range, the pulses are limited in amplitude and the difference in the number of oscillations of the calibrated one controlled by them is determined generator, switched on by front and switched off by falling edges of each measured pulse.