SU310186A1 - AUTO-COMPENSATION PULSE VOLTMETER - Google Patents

Description

The invention can be used to measure the median amplitude distribution of pulses from nuclear radiation detectors, as well as to measure the amplitude of pulses in radio devices.

The known self-compensation voltmeter circuits have the disadvantage that they can measure only the amplitude of the pulses with zero dispersion.

The purpose of the invention is the creation of such an autocompensation pulse voltmeter with which one could measure the median of the amplitude distribution of pulses with non-zero disinger.

In the proposed voltmeter, this goal is achieved by introducing into the circuit of a second discriminator with a fixed low threshold and a second generator of current pulses associated with it, which during 1 operation can reduce the charge of the capacitor in the reverse circuit

R.

connection by value

The drawing shows a block diagram of the described voltmeter.

Autocompensation pulse voltmeter consists of discriminator /, discriminator 2, generator 3 current pulses, DaTopa gene 4 current pulses, storage capacitor 5, buffer stage 6 and meter 7. The discriminator threshold / is uniquely determined by the potential on the capacitor 5. The discriminator 2 threshold is fixed and has a minimum value. The measured pulses are applied to both discriminators simultaneously. Discriminators trigger and start current pulse generators if the amplitude of the measured pulses exceeds their thresholds. The direction of the currents ij and ta is shown in the drawing by arrows. I. current pulses (i are generated by a generator of 3 current pulses, and current pulses of Io are generated by a generator of current pulses 4. Each current pulse i increases the charge on the capacitor by Q, each current pulse i decreases the charge on the capacitor by

The discriminator threshold is determined by the meter 7. The limits of the potential change on the capacitor 5 must be determined by a separate device so that the minimum potential on the capacitor corresponds to the minimum threshold of discriminator 1, and the maximum potential on the capacitor corresponds to the maximum threshold of the discriminator /.

Before measuring, the potential at the capacitor and, therefore, the threshold of the discriminator 1 can be any. At the beginning of the measurement, both discs are triggered from each pulse.

It loses charge on the capacitor by the amount Q, and the generator 4 current pulses reduces

this charge by the value of -. Therefore, after

Zi

each pulse charge on the capacitor

increases by

i

on the condenser rises. The threshold of the discriminator I also increases, and pulses with a small amplitude do not cause it to work anymore. The potential on the capacitor increases more slowly and reaches a stationary value when only half of the measured pulses exceed the discriminator threshold /. In this case, the average current and equal to the average current it.

If, prior to the measurement, the potential at the capacitor has a maximum value, then during the measurement it decreases to a stationary value.

The duration and amplitude of the pulses (their average amplitude can be measured) are determined only by the choice of discriminators / and 2.

Subject invention

An autocompensation pulse voltmeter containing an amplitude discriminator with a tracking threshold, a discriminator controlled generator of current pulses that increase the charge on the storage capacitor by Q, a storage capacitor, a buffer stage and a meter that is different in that in order to measure the median of the amplitude distribution of pulses with a non-zero variance, the input of the circuit is connected to the input of an additional discriminator with a fixed low trigger threshold, the output of which is through a pulse generator current, reducing the magnitude of the charge capacitance on - connected to a storage

the capacitor.

entrance