Precautions for thickness gauge.
The main testing methods of thickness gauge are: magnetic thickness measurement method, radiation thickness measurement method, electrolytic thickness measurement method, eddy current thickness measurement method, and ultrasonic thickness measurement method. Measurement notes:
a. When conducting the test, it should be noted that the metal magnetism and surface roughness of the standard piece should be similar to that of the test piece.
b. Keep the side head perpendicular to the surface of the sample during measurement.
c. Pay attention to the critical thickness of the base metal when measuring. If it is greater than this thickness, the measurement will not be affected by the thickness of the base metal.
d. When measuring, pay attention to the influence of the curvature of the specimen on the measurement. Measurements on curved specimen surfaces are therefore unreliable.
e. Before measuring, pay attention to whether other surrounding electrical equipment will generate magnetic fields. If so, it will interfere with the magnetic thickness measurement method.
f. When measuring, be careful not to measure at inner corners or close to the edge of the specimen, because general thickness gauges are very sensitive to sudden changes in the surface shape of the specimen.
g. Keep the pressure constant during measurement, otherwise it will affect the measurement reading.
h. When testing, it should be noted that the instrument probe and the tested piece must be in direct contact, so the ultrasonic thickness gauge is cleaning the attached material on the opposite side.
