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No. 99MBB091A
14. REFERENCE INFORMATION
14.5.5 Maximum height of the profile, Ry (DIN, ANSI)
14.5.6 Maximum height of the profile, Rz (DIN, ISO, ANSI, JIS’01)
Obtain the sum Zi of profile peak height Pi and profile valley depth Vi for each sampling
length. The maximum value of all Zi’s over the evaluation length is defined as Ry (DIN,
ANSI), and the mean value is Rz (DIN, ISO, ANSI). In the following figure Zn corresponds
to Ry (DIN, ANSI, JIS’01).
Rz (DIN) =
Z1+Z2+Z3+Z4+Z5
5
(where, the number of the sampling lengths is 5)
Sampling length
Evaluation length
Z1 P1
V1
Zi Pi
Vi
Zn Pn
Vn
● Profile peak/profile peak height and profile valley/profile valley depth of assessed
profiles
A portion that projects upward (convex) from the mean line of the assessed profile is
called the “profile peak”, and that which projects downward (concave) is called the
“profile valley”.
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”.
14.5.7 Maximum profile height, Rp (DIN, ISO, JIS’94, JIS’01)
Obtain the profile peak height Rpi for each sampling length of the assessed profile. The mean
of the Rpi’s obtained over the evaluation length is the Rp.
Rp =
Rp1+Rp2+Rp3+Rp4+Rp5
5
(where, the number of the sampling lengths is 5)
● Rp (ANSI, JIS’82) is the maximum profile peak height over the evaluation length.
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