No. 99MBB765A
23.5.25 mr[c] (ISO1997, JIS1994, 2001, VDA, Free), tp (ANSI): Material-ratio length
rate
If you add a parallel line (called a slice line) above the mean line, then the mr[c] value for
that slice level is the ratio (%) between the sum of the base lengths of the sections that
protrude above the slice line (the length between where the evaluation profile and the slice
line intersect) and the evaluation length. The slice level is defined as the depth from the
highest peak, and is called a “peak reference”. The slice level is determined by the ratio (0
to 100%) of the depth to the Rt value.
( )
∑
=
=×=
n
i
bip
n
l
p
cmr
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%100)
(
η
η
Material-ratio length rate, mr[c]
There are 2 ways of setting the slice level: peak reference and base reference.
• Peak reference
The slice level is specified by the depth from the highest point on the evaluation
profile. The depth from this point can be set either as a percentage of Rt or as an
absolute numeric value.
• Base reference
The slice level is specified by the distance from the mean line. The distance from the
mean line can be set either as a percentage of Rt or as an absolute numeric value.
Therefore, when adding the slice line above (+) the mean line, enter a positive
number, and when adding the slice line below (-) the mean line, enter a negative
number.
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