RU1788474C - Zero drift corrector - Google Patents

Abstract

The invention relates to an electrical measuring technique, in particular to methods for compensating for a beam drift in order to increase measurement accuracy, a differentiator is additionally introduced into the device, the output of which through a zero crossing detector is connected to the first input of circuit I, an RC isolation link, the output of which is through a negative comparator 7 is connected to the second input of the And circuit, and its output is to the control input of the sample-storage circuit, which is connected by its output to the inverting input of the summing amplifier. The inputs of the differentiator, the RC isolation link, and the information input of the retrieval-storage circuit are connected to the output of the amplifier. 1 ill.

Description

The invention relates to measuring technique and can be used to indicate reciprocating machines.

Closest to the proposed device is a device containing an input amplifier, a summing amplifier, a storage capacitor, switches at the input and output of the input amplifier, a recorder. When monitoring zero drift, maintenance personnel must use the switches to disconnect the device from the input source. This circumstance complicates the measurement process and affects the accuracy of zero drift correction.

An object of the present invention is to improve accuracy.

This object is achieved in that the device comprising an input amplifier output coupled to a non-inverting input of a summing amplifier, the output of which is connected to a recorder according to the invention, further comprises a differentiator, detector zero, circuit I, RC link. the comparator and the sample-storage circuit, which is connected to the inverting input of the summing amplifier by its output, is connected to the output of the input amplifier by an information input, and to the output of the circuit I by the control input. Moreover, the first and second inputs of circuit I are connected respectively through a series-connected detector zero and differentiator and through a series-connected comparator and RC-link with the output of the input amplifier.

The drawing shows a block diagram of a device that contains an input amplifier 1, a differentiator 2, a detector null 3, a circuit AND 4, an RC link 5, a comparator 6, a sampling-storage circuit 7, a summing amplifier 8 and a recorder 9.

The device operates as follows.

The input signal through the input amplifier 1 is supplied to the input of the differentiator

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with

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2

2, to the input of the RC link 5, to the information input of the sampling and storage circuit 7 and to the non-inverting input of the summing amplifier 8. The signal, the passage of the differentiator 2 and the detector zero 3, which generates short pulse signals, is fed to the first input of the And 4. RC circuit -link 5 passes the variable component of the input signal to the input of comparator 6, which, with a negative input signal, generates a signal of a logical unit at its output and feeds it to the second input of circuit I. 4. When a signal equal to a logical unit is supplied to both inputs of circuit And about and transmits short pulses from the detector zero. The signal from the And circuit is supplied to the control input-sampling-storage circuit 7, which selects the minimum input signal coming into the device and feeds this signal to the inverting input of the summing amplifier 8. The summing amplifier lowers the input signal curve to zero and feeds this signal to the recorder 9.

In comparison with the prototype, the proposed device will improve the accuracy of measurements by constant, automatic

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0

5

corrected drift zero input signal.

The invention will make it possible to increase the accuracy of measuring the parameters of the working fluid in rapidly varying processes, which is the expected technical and economic effect from the use of the proposed device.

Claims (1)

SUMMARY OF THE INVENTION A device for compensating for a drift of zero, comprising an input amplifier output connected to a non-inverting input of a summing amplifier, the output of which is connected to a recorder, characterized in that, in order to improve accuracy, a differentiator, a zero detector, an I circuit, an RC link are inserted into it , a comparator and a sampling-storage circuit, the output connected to the inverting input of the summing amplifier, the information input to the output of the input amplifier, and the control to the output of the circuit And, the first and second inputs of which dineny respectively connected via a series-zero detector and differentiator and comparator through a series connected RC-member and with the output of the input amplifier.