5
R
y
Maximum Roughness Depth — For the Evaluation Length equaling
one cutoff, it is the vertical distance between the highest peak and the
deepest valley within the sampling length. For the Evaluation Length
equaling 3 cutoffs, it is the largest of the 3 maximum peak-to-valley
roughness depths in 3 successive sampling lengths.
3RFNHW6XUI0HDVXUHPHQW3DUDPHWHUV
(continued)
Parameters as per
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Standards
R
a
Arithmetic mean roughness
R
a
DIN EN ISO 4287: 1998
ISO 4287: 1997
JIS B 0601: 1994 + 2001
R
z
Mean Peak to Valley Height
R
z
Ry
(JIS B 0601: 1994) Corresponds with
R
z
DIN EN ISO 4287: 1998
ISO 4287: 1997
JIS B 0601: 2001
R
max
Maximum roughness height
R
max
(formerly: DIN 4768: 1990)
VDA 2006: 2002
