23. REFERENCE INFORMATION
No. 99MBB765A
(2) Zt: Zt > Zmin (Example: Zmin = 10% of Rz)
Profile element (Zt)
Zt > Zmin Mountains and valleys that do not meet the condition “Zmin = Rz for
slice-level height (% or µm)” are not considered profile elements and are excluded
from the calculation.
• If the value for Xs, shown in the previous graph, is less than 1% of the sampling
length, then the section of the profile is not considered a profile element and is
excluded from the calculation.
• For ANSI, Rsm is defined over the entire evaluation length.
23.5.13 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
• If 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, if the distance (in
the sampling direction) between adjacent convexities is less than 1% of sampling
length l, or if the depth of the concavities is less than 10% of Ry, the convex portion
does not qualify as a local peak.
Local peaks
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