Fully-automatic zero adjustment electronic type ballistic galvanometer and zero adjustment method thereof

Abstract

The invention relates to a fully-automatic zero adjustment electronic type ballistic galvanometer and a zero adjustment method thereof. The fully-automatic zero adjustment electronic type ballistic galvanometer and the zero adjustment method thereof have deviation compensation automatic correction capacity and are simple in an adjustment process. The ballistic galvanometer of the invention comprises an integrator, a data acquisition and zero adjustment circuit, a signal detector and a display; the integrator includes a high-open-loop-gain low-drift operational amplifier AD708, an integrating resistor and an integrating capacitor; the anti-phase input end of the AD708 is connected with one end of the integrating resistor R1; the other end of the R1 is adopted as the input end of the integrator; the data acquisition and zero adjustment circuit includes a single-channel bipolar voltage input serial output A / D converter, a serial input single-channel bipolar voltage output D / A converter, an alternative bidirectional analog switch CD4053 and a single-chip microcomputer; the signal detector includes a follower, two comparators LM319 and a monostable trigger which is made of the CD4013; the output end of the monostable trigger is connected with the interruption request input end of the single-chip microcomputer; the display receives data through a serial port and displays the data, wherein the data are sent by the single-chip microcomputer; the zero drift of the integrator is the zero drift of the whole device.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic measurement, and relates to an electronic impulse galvanometer and a fully automatic and accurate zero adjustment method thereof. Background technique [0002] Integrators composed of integrated linear operational amplifiers have been widely used in the field of electromagnetic measurement. The electronic shock galvanometer composed of this integrator can directly integrate the induced electromotive force of the detection coil, and can measure the instantaneous change of the magnetic field. It can be used to measure the constant magnetic field, alternating magnetic field and pulse magnetic field, and it is easy to realize its measurement automation and The measurement results are digitized. When the input voltage to the integrator is zero, the output voltage of an ideal integrator should remain constant. Due to the influence of input bias current, input offset current, input offset volta...

AI Technical Summary

Problems solved by technology

The above-mentioned compensation methods require that the relevant components must be carefully selected and matched, and it is inevitable that there will be deviations. Moreover, there is no mechanism for automatically correcting compensation deviations in the scheme, so it is difficult to obtain a good compensation effect, and it also brings a lot of troubles to production. It is very difficult to achieve mass production and popularization of applications

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