Hitachi TM3030 Plus - Page 382

Appendix - 2
4. Rv (Maximum Profile Valley Depth)
Distance from the centerline to the largest valley
Rv
5. Rp (Maximum Profile Peak Height)
Distance from the centerline to the highest peak
Rp
6. Rms (Root Mean Square)
The square of the deviation from the centerline to the roughness curve
fx()
is
integrated over 1 segment of the measured length, and the square root is taken of the
average over the segment:
 
R
ms
l
f
x dx
l


1
0
2
7. Ra (Roughness Average)
Arithmetic average of absolute values
R
a
l
f
x
dx
l


1
0
( )
8. Rz (Maximum Height of the Profile)
Distance from the highest peak to the deepest valley