Mitutoyo SJ-210 - Rku (JIS2001, ISO1997, ANSI, VDA, Free): Kurtosis

18. Reference Information
No.99MBB122A
18-23
18.5.9 Rku (JIS2001, ISO1997, ANSI, VDA, Free): Kurtosis
Ku represents the degree of concentration around the mean line of an amplitude
distribution curve
*1
.



n
i
Yi
n
Rq
Rku
1
4
4
11
*1: For details about amplitude distribution curves, refer to 18.5.35, “ADC: Amplitude
distribution curve”.
Amplitude distribution curve
 For ANSI, Ku is defined over the entire evaluation length.
Large Ku
Small Ku
Triangular wave Sine wave Square wave
Ku = 1.79 Ku = 1.5 Ku = 1