Mitutoyo SJ-210 - Rsm (JIS1994;2001, ISO1997, ANSI, VDA, Free): Mountain and Valley Mean Width

18. Reference Information
No.99MBB122A
18-25
18.5.12 RSm (JIS1994/2001, ISO1997, ANSI, VDA, Free): Mountain and valley mean
width
Portions of the evaluation profile that project upwards are called “profile element
mountains”, and portions of the profile that project downwards are called “profile element
valleys”. A mountain followed by a valley is called a “profile element”. The value of this
parameter is the arithmetic mean of the width (Xs) of each profile element.



n
i
Xsi
n
Rsm
1
1
 Definition of profile element restrictions
As in the following graph, 1 profile element is 1 pair of mountains and valleys. There
are the following 2 types of setting conditions for profile elements.
(1) Zp / Zv: Zp > Zmin, Zv > Zmin (Example: Zmin = 10% of Rz)
Profile element (Zp/Zv)
Zp > Zmin, Zv > 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.
Zp
Zv
Xs2 Xs1
Peak Peak
Valley
Valle
y
10% of Rz
Evaluation profiles
Mean line