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Factors affecting the measurement data of the coating thickness gauge
Dec 06, 2018

Factors affecting the measurement data of the coating thickness gauge


Let's talk about the influencing factors of the measurement data of the coating thickness gauge.


1. The measurement accuracy and thickness of a thin coating are irrelevant and are a constant. The measurement accuracy of a thick coating is an approximately constant product of fraction and thickness.


2, the change of the magnetic properties of the substrate will affect the measured data, so the coating thickness gauge should be calibrated with the same calibration of the material and the substrate; the instrument to be plated is used as the substrate for instrument calibration to avoid different collective or local heat treatment. And cold machining affect measurement data.


3. The measurement data of the coating thickness gauge near the edge or inner corner of the specimen is often unreliable. This effect may extend from the discontinuity to about 20 mm.


4. When the coating thickness gauge measures the curved surface, the data is obvious as the radius of curvature decreases.


5. The coating thickness gauge probe and sample should be kept clean, because the external adhesion dust will affect the measured data.


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