Mitutoyo SJ-210 - Page 362

18. Reference Information
No.99MBB122A
18-5
■ Standard sampling lengths and evaluation lengths for the measurement of Ra and Rq from non-periodic
roughness profiles
Ra Range Sampling length (ℓ) Evaluation length (ℓn)
㧔0.006㧕 㧨
Ra
҇
0.02 µm 0.08 mm 0.4 mm
0.02
㧨
Ra
҇
0.1 µm 0.25 mm 1.25 mm
0.1
㧨
Ra
҇
2.0 µm 0.8 mm 4 mm
2.0
㧨
Ra
҇
10.0 µm 2.5 mm 12.5 mm
10.0
㧨
Ra
҇
80.0 µm 8 mm 40 mm
■ Standard sampling lengths and evaluation lengths for measurement of Rz, Rp, and Rt from non-periodic
roughness profiles
Rz range Sampling length (ℓ) Evaluation length (ℓn)
㧔0.025㧕 㧨
Rz
҇
0.10 µm 0.08 mm 0.4 mm
0.10
㧨
Rz
҇
0.50 µm 0.25 mm 1.25 mm
0.50
㧨
Rz
҇
10.0 µm 0.8 mm 4 mm
10.0
㧨
Rz
҇
50.0 µm 2.5 mm 12.5 mm
50.0
㧨
Rz
҇
200.0 µm 8 mm 40 mm