23. REFERENCE INFORMATION
No. 99MBB765A
23.5.3 Rz (JIS2001, ISO1997, ANSI, VDA, Free), Rmax (JIS1982),
Ry (JIS1994, Free): Maximum height
Divide the evaluation profile into segments based on the sampling length. Then, for each
segment, obtain the sum (Zi) of the highest point from the mean line (Pi) and the lowest
point from the mean line (Vi). The average of these sums is Rz, Rmax (for JIS1982), or Ry
(for JIS1994).
(When n=5, where n is the number of segments)
Rz maximum height
• Evaluation profile mountains/peaks and valleys/floors
When the evaluation profile contains a mean line, portions of the profile that project
above the mean line are called “mountains”, and portions of the profile that project
below the mean line are called “valleys”. The highest point of each mountain is called
the “peak”, and the deepest point of each valley is called the “floor”.
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