Mitutoyo SJ-210 - Rp (JIS2001, ISO1997, ANSI, VDA, Free), Rpm (ANSI): Tallest Peak; Rv (JIS2001, ISO1997, ANSI, VDA, Free): Maximum Valley Depth; Rt (JIS2001, ISO1997, ANSI, VDA, Free): Maximum Roughness; R3 Z (Free): Third-Level Height

18. Reference Information
No.99MBB122A
18-21
18.5.4 Rp (JIS2001, ISO1997, ANSI, VDA, Free), Rpm (ANSI): Tallest peak
Divide the evaluation profile into segments of based on the sampling length. Then, for
each segment, obtain the distance of the highest point (Rpi) from the mean line. Rp is the
mean of the Rpi values that were obtained from the segments.
5
54321 RpRpRpRpRp
Rp


(When n=5, where n is the number of segments)
 Rp (ANSI) is defined as the maximum peak height over the evaluation length.
18.5.5 Rv (JIS2001, ISO1997, ANSI, VDA, Free): Maximum valley depth
Divide the evaluation profile into segments based on the sampling length. Then, for each
segment, obtain the distance of the lowest point (Rvi) from the mean line. Rv is the mean
of the Rvi values that were obtained from the segments.
5
54321 RvRvRvRvRv
Rv


(When n=5, where n is the number of segments)
 Rv (ANSI) is defined as the maximum floor depth over the evaluation length.
18.5.6 Rt (JIS2001, ISO1997, ANSI, VDA, Free): Maximum roughness
Rt is the sum of the distance from the mean line to the highest peak and the distance from
the mean line to the deepest floor, for the entire evaluation length.
18.5.7 R3z (Free): Third-level height
Divide the evaluation profile into segments based on the sampling length. Then, for each
segment, obtain the sum (3Zi) of the distance of the 3rd highest peak from the mean line
and the distance of the 3rd deepest floor from the mean line. R3z is the mean of the 3Zi
values obtained from the segments.
 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”. However, when
the distance of a peak or valley floor from the mean line is less than 10% of the Ry
value, the peak/floor is not regarded as a peak or floor.