There are several primary reasons why coating thickness gauges measure inaccuracies.
The coating thickness gauge adopts the new magnetic induction technology, that is, the Hall effect. By studying the relationship between the Hall voltage and the operating current, it measures the magnetic field and permeability of the electromagnet, and studies the relationship between the Hall voltage and the magnetic field. This magnetic field becomes regular. When this principle is applied to the coating thickness gauge, there is no need to adjust the test piece. Especially when measuring arc or concave products, it is more simple and convenient to use.
The coating thickness gauge uses the electromagnetic induction method to measure the thickness of the coating. The probe located on the surface of the component generates a closed magnetic circuit. As the distance between the probe and the ferromagnetic material changes, the magnetic circuit will change to varying degrees, causing changes in the magnetic resistance and inductance of the probe coil. This principle can be used to accurately measure the distance between the probe and the ferromagnetic material, that is, the coating thickness.
If the coating thickness gauge is not used for a long time, it needs to be charged and discharged regularly to prevent the battery from locking up. For some small workpieces or workpieces with a particularly thin coating layer, it is recommended to use continuous measurement.
There are several reasons for the measurement error of the coating thickness gauge:
1. The structure and shape of the material to be measured by the thickness gauge are different. On workpieces with different structures, the magnetic field distribution will vary with different structures and shapes, which will cause measurement errors.
2. The measured material itself contains magnetism. Some materials have a residual magnetic field in the material to be tested during processing or certain process requirements. Due to its uneven distribution, the resulting measurement error is also inconsistent, and the measured value of some parts on the same workpiece will suddenly become larger or smaller.
3. Different parts of the same material may also produce changes in the magnetic field. For example, the magnetic field distribution is different between the edge and the middle area of the material, which will cause measurement errors.
4. The properties of the measured materials are different, the magnetic flux will be different, which is also one of the reasons for the error.
5. The size and thickness of the material are different, which can also lead to measurement errors.
6. The surface of the measured material is not smooth enough, which is also the cause of the error.
