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How to calibrate the coating thickness gauge
Dec 19, 2018

How to calibrate the coating thickness gauge


Let's talk about how to calibrate the coating thickness gauge.


1. Correct calibration is critical to accurate measurements. For calibration, a sample similar to the object being measured will be used, ie, both the standard and the measured object should have the same shape and geometry. Basically, the standard samples of more measuring objects match and the measurement results will be more accurate.


2. Determine the following properties of the calibration sample and the object to be measured: - radius of curvature of the surface - substrate material (such as magnetic permeability, conductance; in an ideal manner, the standard sample and the measurement object should be the same material) --Substrate thickness -- the size of the measurement area


3. Make sure the calibration point, sensor tip and calibration template are clean before starting the calibration. Remove any deposits such as grease, metal shavings, etc. if necessary. Any impurities can affect the calibration and cause instability in the calibration.


4. Make sure to always find the same calibration position, especially for small parts and for angular measurements. Measuring brackets are recommended for small parts.


5. Keep away from strong magnetic fields during the calibration process.


6. More calibration standards can be matched to the expected thickness to make calibration and measurement more accurate.


7. According to the electromagnetic induction method, the thickness of the non-ferrous metal coating on the steel or iron substrate is measured, and multi-point correction is required. The thickness standard sample must be made of the same metal as the object to be measured later.


8. If calibration foils are used, make sure they are placed in the planar position of the substrate material. The air gap under the foil must be avoided as this will result in an unstable reading. If it is a curved aluminum foil, make sure they are placed on the substrate as shown below.


9. Precision thickness standards must be handled with care. Any wear and tear of the thickness standard will be reflected in the wrong calibration value. Do not fold the calibration foil. Any buckling will result in an air gap under the film, resulting in an unstable reading. Keep the thickness standard clean. Any grease, oil, dust or other deposits must be avoided. The deposit of aluminum foil will be considered as a thickness and will result in a measurement error of the same value as the thickness of the deposit. Give you a rough idea: a fingerprint deposit is enough to cause an additional thickness error of a few microns.


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