Measurement of uniformity of uniformity zone

Measuring the uniformity of the uniform area: Make the power output to a certain value and wait for it to stabilize, measure the central magnetic field of the coil, move the field meter smoothly in the uniform area to ensure that the probe does not tilt and rotate, and record the value of the magnetic field at each point in the uniform area. If the central magnetic field value is H0 and the magnetic field value of another point in the uniform zone is H1, then the magnetic field deviation at this point is ΔH=H1-H0, and the uniformity of the magnetic field at this point is ΔH/H0;