Mitutoyo SURFTEST SJ-410 - BAC: Material-Ratio Profile

23. REFERENCE INFORMATION
No. 99MBB765A
23-37
23.5.37 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 information about the peak/base reference, refer to "23.5.24 mr (JIS2001, ISO1997,
ANSI, VDA, Free): Material-ratio-length rate" (page 23-29).
*2: For information about Rt, refer to "23.5.6 Rt (JIS2001, ISO1997, ANSI, VDA, Free):
Maximum roughness" (page 23-20).
mr value
DEPTH (%)