How to use the coating thickness gauge to avoid reducing errors
When using the coating thickness gauge to measure, try to use the measured material as the zero-adjustment substrate to avoid measurement errors caused by different materials with different magnetic permeability. Wait until the same part of the material to be tested is zeroed, and then measure the same part, such as the edge and middle part of the workpiece on the side face, which should be zeroed separately.
When measuring with a coating thickness gauge, 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 performed after a few seconds, so as to avoid the measurement result being affected by the magnetization of the probe of the measured material.
The surface of the coating thickness gauge used for zero adjustment needs to be kept as smooth as possible. If the surface is not smooth, the average value should be taken according to the situation, because the surface roughness has a great influence on the measured value. The different structures should be measured separately with zero adjustment, the plane is zeroed and the side face plane is measured, the concave surface is measured after zeroing, and the convex surface is measured after zeroing, so as to avoid errors in measurement due to different structures.
