Mitutoyo SJ-210 - Rsk (JIS2001, ISO1997, ANSI, VDA, Free): Skewness (Degree of Asymmetry)

No. 99MBB122A
18-22
18.5.8 Rsk (JIS2001, ISO1997, ANSI, VDA, Free): Skewness (degree of asymmetry)
Rsk represents the degree of bias either in the upward or downward direction of an
amplitude distribution curve
*1
.



n
i
Yi
n
Rq
Rsk
1
3
3
11
*1: For details about amplitude distribution curves, refer to 18.5.35, “ADC: Amplitude
distribution curve”.
Amplitude distribution curve
 For ANSI, Rsk is defined over the entire evaluation length.
Mean line Measured profile Amplitude Distribution Curve
Sk = 0
Sk < 0
(Abrasion resistance: large)
Sk > 0
(Abrasion resistance: small)