Mitutoyo SJ-210 - BAC: Material-Ratio Profile

No. 99MBB122A
18-42
18.5.34 BAC: Material-ratio profile
BAC is a curve that represents the material ratio of the evaluation profile, where the mr
values are plotted on the abscissa while the slice levels are on the ordinate. The BAC is a
curve where the horizontal axis represents mr values and the vertical axis represents slice
levels.
There are 2 types of BAC depending on how the slice levels were obtained.
 This is based on the BAC reference peak
*1
and consists of making mr values obtained
from the slice levels (vertical axis) of the percentage (0 to 100%) against the Rt
value
*2
on the horizontal axis, and making the range of the vertical axis 0 to 100%.
Material-ratio profile (BAC)
*1: For details about the peak/base reference, refer to 18.5.21, “mr (JIS2001, ISO1997,
VDA, Free): Material-ratio length rate”.
*2: For details about Rt, refer to 18.5.6, “Rt (JIS2001, ISO1997, ANSI, VDA, Free):
Maximum roughness”.
mr value
DEPTH
(
%
)