In this paper,the principle of Helmholtz coil is analyzed,and the simulation software COMSOL is used to simulate Helmholtz coils with different radii and coil spacings,and the factors affecting the magnitude and uniformity zone of its magnetic induction intensity are analyzed.Based on the simulation results,a set of calibration device is designed to meet the calibration specifications of magnetic magnetometer,and the results of experimental verification show that the magnetic field range of the Helmholtz coil of the calibration device is from 0.05 mT to 10 mT,and the diameter of the uniform zone is larger than 60 mm when the uniformity meets the requirement of 0.2％,and the relative extended measurement uncertainty of this device for calibrating the magnetic magnetometer is 1.2％.
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