Mitutoyo SJ-301 - Ten-Point Height of Irregularities, Rz (JIS82, JIS94)

14 - 20 No. 99MBB091A
14.5.4 Ten-point height of irregularities, Rz (JIS’82, JIS’94)
Sum of the mean height of the five highest profile peaks and the mean depth of five deepest
profile valleys measured from a line parallel to the mean line.
5
i=1
Rz (JIS'82, JIS'94) =
1
5
Ypi +
5
i=1
1
5
Yvi
Yv1
Yv2
Yp1
Yp2
Yp3
Yp5
Yp4
Yv3
Yv5
Yv4
● Profile peak/profile peak height and profile valley/profile valley depth of assessed
profiles
The distance between the mean line and the highest point of the profile peak is the
“profile peak height”. The distance between the mean line and the lowest point of the
profile valley is the “profile valley depth”.
However, if the distance (between the mean line and the highest point of the profile peak
or lowest point of the profile valley) is less than 10% of the Ry value, it is not regarded as
the profile peak height or profile valley depth, respectively.
Ry
10
or more
Ry
10
or more
Profile peak
Lowest
p
oint of the
p
rofile valle
y
Profile valle
y
Highest point of the profile peak