Several major reasons for measurement errors in coating thickness gauges
The coating thickness gauge adopts a new magnetic induction technology, which is the Hall effect. By studying the relationship between Hall voltage and working current, the magnetic field and permeability of the electromagnet are measured, and the relationship between Hall voltage and magnetic field is studied. This magnetic field becomes regular. When this principle is applied to a coating thickness gauge, there is no need to adjust the test piece again. Especially when measuring products with circular or concave surfaces, it is simpler and more convenient to use.
The coating thickness gauge uses electromagnetic induction method to measure the thickness of the coating. The probe located on the surface of the component generates a closed magnetic circuit, which will change to varying degrees as the distance between the probe and the ferromagnetic material changes, causing changes in magnetic resistance and probe coil inductance. This principle can be used to accurately measure the distance between the probe and the ferromagnetic material, i.e. the coating thickness.
The coating thickness gauge should be regularly charged and discharged if not used for a long time to prevent the battery from locking. For some small workpieces or workpieces with a particularly thin coating layer, it is recommended to use continuous measurement.
Several major causes of measurement errors in coating thickness gauges:
1. The thickness gauge measures materials with different structures and shapes. On workpieces with different structures, the magnetic field distribution will vary with the structure and shape, resulting in measurement errors.
2. The tested material itself contains magnetism. Some materials may have residual magnetic fields inside the tested material during processing or certain process requirements. Due to its uneven distribution, the measurement errors caused by it are also inconsistent, and the measurement values in certain parts of the same workpiece may suddenly increase or decrease.
3. Different parts of the same material may also produce changes in magnetic field, such as different magnetic field distributions at the edges and middle areas of the material, which can lead to measurement errors.
4. Different properties of the tested material result in different magnetic fluxes, which is also one of the reasons for errors.
5. Different sizes and thicknesses of materials can also lead to measurement errors.
6. The surface of the tested material is not smooth enough, which is also the reason for the error.
