27
28
References
Terms
The instrument calculate parameters on the filter profile and the
direct profile , all calculated in line with the GB / T 3505-2000
"Geometrical Product Specification(GPS) —— Surface texture:
Profile method——Term,definitions and surface texture
parameters."
Terms
Filtered profile: profile signal after primary profile is filtered to
remove waviness.
D-P (direct-profile): adopt central line of Least Square Algorithm.
RC filter: analogue 2RC filter with phase difference.
PC-RC filter: RC filter with phase-correction.
Gauss filter: ISO11562.
Traversing Length
Parameters Definitions
Arithmetical Mean Deviation of Profile
Ra
Ra is arithmetic mean of the absolute values of profile deviation
Z(x) from mean within sampling length.
Z
1
Z
2
Zi
Zn
Root-mean-square Deviation of Profile
Rq
Rq is the square root of the arithmetic mean of the squares of
profile deviation Z(x) from mean within sampling length.
1
1
1
2
