Mitutoyo SURFTEST SJ-410 - Evaluation According to JIS B0601-1994

No. 99MBB765A
23-2
23.1.2 Evaluation according to JIS B0601-1994
■ Standard cut-off values and evaluation lengths for Ra
Ra Range
Cut-off length (λc)
Sampling length (ℓ)
Evaluation length (ℓn)
（0.006）
< Ra ≤ 0.02 µm 0.08 mm 0.08 mm 0.4 mm
0.02 < Ra ≤ 0.1 µm 0.25 mm 0.25 mm 1.25 mm
0.1 < Ra ≤ 2.0 µm 0.8 mm 0.8 mm 4 mm
2.0 < Ra ≤ 10.0 µm 2.5 mm 2.5 mm 12.5 mm
10.0 < Ra ≤ 80.0 µm 8 mm 8 mm 40 mm
■ Standard cut-off values and evaluation lengths for Ry
Ry Range
Cut-off length (λc)
Sampling length (ℓ)
Evaluation length (ℓn)
（0.025）
< Ry ≤ 0.10 µm 0.08 mm 0.08 mm 0.4 mm
0.10 < Ry ≤ 0.50 µm 0.25 mm 0.25 mm 1.25 mm
0.50 < Ry ≤ 10.0 µm 0.8 mm 0.8 mm 4 mm
10.0 < Ry ≤ 50.0 µm 2.5 mm 2.5 mm 12.5 mm
50.0 < Ry ≤ 200.0 µm 8 mm 8 mm 40 mm
■ Standard cut-off values and evaluation lengths for Rz
Rz range
Cut-off length (λc)
Sampling length (ℓ)
Evaluation length (ℓn)
（0.025）
< Rz ≤ 0.10 µm 0.08 mm 0.08 mm 0.4 mm
0.10 < Rz ≤ 0.50 µm 0.25 mm 0.25 mm 1.25 mm
0.50 < Rz ≤ 10.0 µm 0.8 mm 0.8 mm 4 mm
10.0 < Rz ≤ 50.0 µm 2.5 mm 2.5 mm 12.5 mm
50.0 < Rz ≤ 200.0 µm 8 mm 8 mm 40 mm
■ Standard cut-off values and evaluation lengths for Sm
Sm Range
Cut-off length (λc)
Sampling length (ℓ)
Evaluation length (ℓn)
13 < Sm ≤ 40 µm 0.08 mm 0.08 mm 0.4 mm
40 < Sm ≤ 130 µm 0.25 mm 0.25 mm 1.25 mm
130 < Sm ≤ 400 µm 0.8 mm 0.8 mm 4 mm
400 < Sm ≤ 1300 µm 2.5 mm 2.5 mm 12.5 mm
1300 < Sm ≤ 4000 µm 8 mm 8 mm 40 mm