18. Reference Information
No.99MBB122A
18-27
18.5.13 S (JIS1994, Free): Mean width of local peak
S is the arithmetic mean of the peak-to-peak distances (Si) of local peaks.
Mean spacing, S, of local peaks of profile
When an upward convex portion of an evaluation profile has concavities on both sides,
the highest point of the convex portion is called a local peak. However, when the
distance (in the sampling direction) between adjacent convexities is less than 1% of
sampling length, or when the depth of the concavities is less than 10% of Ry, the
convex portion does not qualify as a local peak.
Local peaks
S1
Si
Sn
Ry/10 or more
Local peaks
Ry/10 or more
1%
or more
1%
or more
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