Causes of Inaccurate Measurement Results of Coating Thickness Gauge
The inaccurate measurement results of the coating thickness gauge are mainly caused by the following reasons:
1. The interference of strong magnetic field. When the instrument works near strong electromagnetic fields, the measurement will be seriously disturbed. If it is very close to the electromagnetic field, there may be a crash phenomenon.
2. Human factors. In the process of measuring with the instrument, if the user is not familiar with the thickness gauge, the probe may deviate from the body under test, causing the magnetic flux to change and cause wrong measurement. Therefore, when using this instrument for the first time, master the measurement method well. The placement of the probe has a great influence on the measurement. During the measurement, the probe should be kept perpendicular to the surface of the sample. And the probe should not be placed for too long, so as not to cause the interference of the magnetic field of the matrix itself.
3. Failure to select a suitable substrate during system correction. The minimum plane of the substrate is 7mm, and the minimum thickness is 0.2mm. Measurements below this critical condition are unreliable.
4. The influence of attached substances. Coating thickness gauges are sensitive to adhering substances that prevent the probe from being in close contact with the coating surface, so the adhering substances must be removed to ensure that the probe is in direct contact with the coating surface. When performing systematic correction, the surface of the selected substrate must also be bare and smooth.
5. The instrument fails. Repair by technicians or return to factory for repair.
