Mitutoyo SURFTEST SJ-410 - Evaluating Based on ANSI

23. REFERENCE INFORMATION
No. 99MBB765A
23-5
23.1.5 Evaluating based on ANSI
Shown below are the standard cut-off values and evaluation lengths for evaluation based
on ANSI.
■ Standard cut-off lengths and evaluation lengths for measuring roughness parameters from periodic profiles
RSm Range
Cut-off length (λc)
Evaluation length (ℓn)
0.013
＜
RSm
≦
0.04 mm 0.08 mm 0.4 mm
0.04
＜
RSm
≦
0.13 mm 0.25 mm 1.25 mm
0.13
＜
RSm
≦
0.4 mm 0.8 mm 4 mm
0.4
＜
RSm
≦
1.3 mm 2.5 mm 12.5 mm
1.3
＜
RSm
≦
4.0 mm 8 mm 40 mm
To select a cut-off value from the previous table, you must estimate the Sm value from an
unfiltered-profile chart.
■ Standard cut-off lengths and evaluation lengths for measuring roughness parameters from non-periodic
profiles
Ra Range
Cut-off length (λc)
Evaluation length (ℓn)
Ra ≤ 0.02 µm 0.08 mm 0.4 mm
0.02 < Ra ≤ 0.1 µm 0.25 mm 1.25 mm
0.1 < Ra ≤ 2.0 µm 0.8 mm 4 mm
2.0 < Ra ≤ 10.0 µm 2.5 mm 12.5 mm