Mitutoyo SJ-210 - A1 (JIS2001, ISO1997, VDA, Free): Peak Area

18. Reference Information
No.99MBB122A
18-39
18.5.31 A1 (JIS2001, ISO1997, VDA, Free): Peak area
From the lines that are obtained by selecting 2 points (point A and point B) on the BAC
(material-ratio profile) that differ in mr value by 40%, obtain the line with the smallest
inclination. Set point C and point D to be the points where the obtained line intersects the
lines at mr = 0 and mr = 100. Set point H to the point on the BAC with the same slice level
as point C, and then set point I to the point were the BAC profile and the slice level at mr =
0 intersect. Next, set point J along mr = 0, so that the area enclosed by line segment CH,
line segment CI, and curve HI and the area of triangle CHJ are the same. A1 is the area of
triangle CHJ. (Peak area)
Peak area A1
D
G
H
C
A
B
E
A2
A1
Rk
Rvk
Mr1 Mr2
40%
J
F
Rpk

,
Rvk
DEPTH (

m)
mr[c] (%)