Why do coating thickness gauges have errors in measurement?
(1) Interference from strong magnetic fields. We once conducted a simple experiment. When the instrument works near an electromagnetic field of about 10,000 V, the measurement will be severely interfered. If you are very close to the electromagnetic field, a crash may occur.
(2) Human factors. This situation often happens to new users. The reason why the coating thickness gauge can measure to the micron level is that it can take small changes in magnetic flux and convert it into a digital signal. During the measurement process, if the user is not familiar with the instrument, the probe may deviate from the body being measured, causing changes in the magnetic flux and causing erroneous measurements. Therefore, it is recommended that users first master the measurement method when using this instrument for the first time. The placement of the probe has a great influence on the measurement. The probe should be kept perpendicular to the surface of the sample during measurement. And the probe should not be placed for too long to avoid interference from the magnetic field of the matrix itself.
(3) No suitable base was selected during system correction. The smallest plane of the substrate is 7mm and the minimum thickness is 0.2mm. Measurement below this critical condition is unreliable.
(4) The influence of attached substances. This instrument is sensitive to attached substances that prevent the probe from making close contact with the covering surface. Therefore, attached materials must be removed to ensure direct contact between the probe and the covering surface. When performing system correction, the surface of the selected substrate must also be bare and smooth.
(5) The instrument fails. At this time, you can communicate with technicians or return to the factory for repair.
