Q&A on the influencing factors of coating thickness gauge
Why do instruments sometimes measure incorrectly?
This is a relatively general question. Because there are various reasons for inaccurate instruments. For a single coating thickness gauge, there are several main reasons for inaccurate measurement.
(1) Interference from strong magnetic fields. We once conducted a simple experiment where when the instrument was operating near an electromagnetic field of around 10000 V, the measurement would be severely disturbed. If it is very close to the electromagnetic field, there may be a crash phenomenon.
(2) Human factors. This situation often happens to new users. The reason why coating thickness gauges can measure to the micrometer level is because they 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 measurement. 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 it 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 with the magnetic field of the substrate itself.
(3) Failure to select a suitable substrate during system calibration. The minimum 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 adhering substances that hinder close contact between the probe and the surface of the covering layer. Therefore, it is necessary to attach substances to ensure direct contact between the probe and the surface of the covering layer. When performing system calibration, the surface of the selected substrate must also be bare and smooth.
(5) The instrument has malfunctioned. At this point, you can communicate with technical personnel or return to the factory for maintenance.
2. Why do there sometimes appear significant deviations in the measurement data during the measurement process?
During the measurement process, incorrect placement of the probe or external interference factors may result in significantly larger measurement data. At this point, you can press and hold the CAL key to clear the data to avoid entering the data statistics.
3. How to calibrate the system?
The method and type of calibration are common issues that new users often encounter. The system calibration, zero calibration, and two other calibration points are actually mentioned in the manual, and users only need to carefully read them. It should be noted that when calibrating the iron base, it is best to measure multiple times to prevent incorrect operations; The samples for system calibration should be carried out in ascending order. If individual standard samples are lost, they can be replaced with samples with similar values.
