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

An inrush current and electronic technology, applied in the direction of measuring electric variables, the size/direction of magnetic field, measuring devices, etc., can solve the problems of difficult mass production and popular application, no automatic correction of compensation deviation, difficult production and other problems, to achieve Easy to promote and apply, good detection effect, easy to mass production

Active Publication Date: 2018-09-04
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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

Examples

Experimental program
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experiment example 1

[0028] In order to verify the feasibility and reliability of the zero-adjustment method of the present invention, an operational amplifier LF353 with a large offset voltage is intentionally used (the typical value of the input offset voltage is 5mV, the input offset voltage drift is 10μV / °C, the typical value of the input bias current is 50pA, and the input The typical value of offset current is 25pA, and the typical value of open loop gain is 10 5 ) assembles a typical inverting input integrator whose integrating resistor R 1 The nominal value is 1kΩ, the nominal value of the integral capacitor C is 1μF, and the resistance R b The nominal value is 1MΩ, and the integral detection time Δt=100ms is set. An analog switch is connected in parallel with the integral capacitor, and the analog switch is controlled by a periodic positive rectangular wave voltage signal: when the rectangular wave voltage is at zero level, the analog switch is turned on to clear the integral capacitor; ...

experiment example 2

[0034] According to the experimental circuit with the same structure as described in the verification experiment example 1, randomly change a piece of LF353 to conduct the same experiment:

[0035] (1) Order U b =0. The digital storage oscilloscope measures the integrated output voltage U of the integrator o1 (t) Curve as attached Figure 6 As shown, the zero drift U of the integrator within the integration time Δt is measured o1 =376mv, estimate the required compensation current i b = 3.76µA and the required compensation voltage U b1 =3.76v.

[0036] (2) Set U b =U b1 =3.76v, the integrator output voltage U after coarse compensation o2 (t) Curve as attached Figure 7 As shown, the integrator at the integration time Δ t Zero drift U o2 =864mv. Find the exact value U of the required compensation voltage b = U b1 u o1 / ( U o1 –U o2 ) =3.848v.

[0037] (3) Set U b =3.848v, the integrator output voltage U after fine compensation o3 (t) Curve as attached Fig...

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PUM

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/02G01R35/00
CPCG01R33/02G01R35/005
Inventor 何森张旭峰王志斌曹美珍高永全何迪和
Owner ZHONGBEI UNIV
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