看了这么多高手的回复,补充点,(来自ISO19840)
5. When the surfaced profile is known and conforms to ISO 8503-1, correction values are given as follows:
Fine 10 μm
Medium 25 μm
Coarse 40 μm
6. When the surface profile is unknown or not available, a correction value of 25 μm shall be used.
7. The correction value is subtracted from the individual reading to give the individual dry film thickness.
For example, the surface roughness is Medium and the individual reading is 275 μm, this gives an individual dry film thickness of 250 microns.