Mitutoyo SURFTEST SJ-410 - Page 592

No. 99MBB765A
23-42
4. Modify the height (or depth) of tall peaks or deep valleys that stand out.
Calculate the mean depth and the standard deviation from the combined motifs.
HjHj
H σ 65.1+=
Hj
Mean depth for motifs
Hj
σ
Standard deviation for motif depth
From the above formulas, obtain the maximum value H.
Peaks and valleys in motifs whose motif depth is greater than H are modified so their
height or depth is H.
In the following figures, Zj+1 is modified to Zj+1'.
Replacing the H level
5. Calculate the parameters defined for roughness motifs.
Note 1. Certain parameters are calculated before the processing described in step 4
is performed.
H
j
Z
j
Z
j+1
Z
j+1
'
H
j+1
Z
j+2
H
H
j
Z
j
H
Z
j+1
'
Z
j+1
Z
j+2
H
j+1
Modifying a tall peak
Modifying a deep valley