Why does the coating thickness gauge produce inaccurate data?
When using the coating thickness gauge to measure, try to use the measured material as the zero-adjustment substrate to prevent the measurement error due to the different magnetic permeability caused by different materials. Wait until the same part of the material to be measured is zeroed, and then carry out the measurement of the same part, such as the edge and middle part of the workpiece on the side face should be zeroed separately.
When using a coating thickness gauge for measurement, it should also be noted that the probe and the surface of the material to be measured are kept vertical to avoid large errors. If the measurement is at the same point, the probe can be separated by more than 10 cm each time, and the measurement should be carried out after a few seconds, so as to avoid the magnetization of the probe of the material under test and affect the measurement results.
The outer surface of the coating thickness gauge used for zero adjustment needs to be kept as smooth as possible. If the outer surface is not smooth, the average value should be taken according to the situation, because the roughness of the outer surface has a great influence on the measured value. Different structures should carry out zero-adjustment measurement respectively, zero-adjust the plane plane, measure the concave surface after zero-adjustment, and measure the convex surface after zero-adjustment, so as to prevent errors in measurement due to different structures.
