Analytical Functions
6-3
Ra (Average Roughness)
Formerly known as Arithmetic Average (AA) and Center Line Average (CL), Ra is the universally
recognized, and most used, international parameter of roughness. It is the arithmetic average deviation
from the mean line (see
Figure 6.2a
) within the assessment length.
Figure 6.0a
Ra Roughness Analytical Function
Rp (Maximum Peak)
The maximum height or the highest peak of the profile roughness above the mean line, within the
assessment length (see
Figure 6.2b
).
Figure 6-2: Rp Roughness Analytical Function
159
MaxRa (Maximum Roughness)
Identifies the portion of the assessment length that has the highest Ra. The assessment length,
defined by the cursors, divides into nineteen overlapping segments. Each segment is equal to
one-tenth of the assessment length distance. The Ra is calculated for each segment. The R
cursor positions in the center of the segment with the highest Ra. You can program only one
MaxRa into a scan program.
Ra (Average Roughness)
Formerly known as Arithmetic Average (AA) and Center Line Average (CL), Ra is the
universally recognized, and most used, international parameter of roughness. It is the
arithmetic average deviation from the mean line within the assessment length.
Figure 6-2: Ra Roughness Analytical Function
RP (Maximum Peak)
The maximum height or the highest peak of the profile roughness above the mean line,
within the assessment length (see
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