ElektroPhysik 29
The mean thickness over the peaks can be
determined as follows (note that the statistics pro-
gram is of great benefit in this procedure):
Method A
This method should be used for surfaces with a
roughness grade of min. 20 µm (0.8 mils).
1.
The gauge should be calibrated according
to the method described in 3.2.2 or 3.2.3. Use
a smooth surface with the same curvature
radius and the same substrate.
2.
Now take approx. 10 readings on the
uncoated, shot-blasted surface to obtain the
mean
Xo
.
3.
Subsequently, take approx. 10 fur ther
readings on the coated and similarly shot
blasted test sample to produce the mean
value
Xm
.
Measurement on shot blasted surfaces
