Mitutoyo SURFTEST SJ-410 - Sm (JIS1994), Rsm (JIS2001, ISO1997, ANSI, VDA, Free): Mountain and Valley Mean Width

No. 99MBB765A
23-24
23.5.12 Sm (JIS1994), RSm (JIS2001, 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
Valley
10% of Rz
Evaluation profiles
Mean line