What are the reasons why coating thickness gauges cause inaccurate measurements?
This is a rather general question. Because there are various reasons for inaccurate instruments. For a single coating thickness gauge, there are several reasons that can cause inaccurate measurements.
(1) Interference from strong magnetic fields. We once conducted a simple experiment where the instrument was subjected to severe interference when operating near an electromagnetic field of around 10000 V. If it is very close to the electromagnetic field, it is possible to experience a crash.
(2) Human factors. This situation often happens to new users. The reason why the coating thickness gauge can measure to the micrometer level is because it can take small changes in magnetic flux and convert it into digital signals. If the user is not familiar with this instrument during the measurement process, it may cause the probe to deviate from the measured body, causing changes in magnetic flux and resulting in incorrect measurements. So it is recommended that users and friends first master the measurement method when using this instrument for the first time. The placement of the probe has a significant impact on the measurement, and the probe should be kept perpendicular to the surface of the sample during measurement. And the placement time of the probe should not be too long to avoid interference from the magnetic field of the substrate itself.
(3) No suitable substrate was selected during system correction. The minimum plane of the substrate is 7mm, and the minimum thickness is 0.2mm. Measuring below this critical condition is unreliable.
(4) The influence of attached substances. This instrument is sensitive to adhering substances that hinder close contact between the probe and the surface of the covering layer. Therefore, it is necessary to remove any attached substances to ensure direct contact between the probe and the surface of the covering layer. When performing system correction, the surface of the selected substrate must also be exposed and smooth.
(5) The instrument has malfunctioned. At this point, you can communicate with technical personnel or return to the factory for maintenance.
