No. 99MBB122A
18-26
(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.
When the value for Xs, shown in the previous graph, is less than 1% of the sampling
length, 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.
Zt
Xt3 Xt1 Xt2
Peak Peak
10% of Rz or more
Evaluation profiles
Mean line
Valley
Valle
Valley
Peak