Mitutoyo SURFTEST SJ-410 - Lr (Free): Expansion Length Ratio; Mr (JIS2001, ISO1997, ANSI, VDA, Free): Material-Ratio-Length Rate

23. REFERENCE INFORMATION
No. 99MBB765A
23-29
23.5.23 lr (Free): Expansion length ratio
Ir is the ratio of the expansion length (Lo) and the sampling length (l), and this ratio
describes the degree of depression in the evaluation profile. (Expansion length ratio)
l
Lo
lr
=
23.5.24 mr (JIS2001, ISO1997, ANSI, VDA, Free): Material-ratio-length rate
Let a slice line whose mr[c] value falls between 0% and 99% (in 1% increments) be the
reference line, and provide more slice lines at constant increments (in µm) below the
reference line. mr[c] values at each slice level are referred to as mr values.
Material-ratio-length rate, mr
There are the following 3 modes for specifying slice lines.
Normal Length (μm)
Rz Percentage of Rz (%)
Rt Percentage of Rt (%)
Reference mr[c] value (%)
mr[c] value (%)
DEPTH (µm)
C
i
Reference line
mrci