Paint film thickness gauge measurement precautions
The test methods of the thickness gauge mainly include: magnetic thickness measurement method, radiation thickness measurement method, electrolytic thickness measurement method, eddy current thickness measurement method, ultrasonic thickness measurement method.
Paint film thickness gauge measurement precautions
During the test, it should be noted that the metal magnetism and surface roughness of the standard part should be similar to the test part.
During measurement, the side head remains perpendicular to the sample surface.
When measuring, pay attention to the critical thickness of the base metal. Above this thickness, the measurement will not be affected by the thickness of the base metal.
When measuring, pay attention to the influence of the curvature of the sample on the measurement. Therefore, measurements on curved specimen surfaces are unreliable.
Before measuring, pay attention to whether other electrical equipment around will generate a magnetic field. If so, it will interfere with the magnetic thickness measurement method.
When measuring, be careful not to measure near the inner corners and the edge of the test piece, because the general thickness gauge is very sensitive to the sudden change of the surface shape of the test piece.
Keep the pressure constant during measurement, otherwise it will affect the measurement reading.
During the test, pay attention to the direct contact between the instrument probe and the test piece, so that the ultrasonic thickness gauge can remove the attachments on the opposite side.
