The equation used for computing the 10-point average roughness Rz stipulated in
JIS B0601:1998 has been expanded to apply to a 3-dimensional plane. (The
10-point average roughness itself is not stipulated in JIS B0601:2001.)
It is stipulated as the “sum of the average value of the absolute values of the devia-
tion from the average height Z
0
in the analysis plane between the largest deviation
and the fifth deviation, and the average value of the absolute values of the deviation
between the smallest deviation and the fifth deviation.
5
5
4
3
2
1
5
4
3
2
1
v
v
v
v
v
p
p
p
p
p
Z
Z
Z
Z
Z
Z
Z
Z
Z
Z
Rzjis
+
+
+
+
+
+
+
+
+
=
Z
p1
,Z
p2
,Z
p3
,Z
p4
,Z
p5
:
Deviation values between the largest deviation and the fifth
deviation in the analysis plane
The corresponding positions are displayed using red char-
acters on the preview screen.
Z
v1
,Z
v2
,Z
v3
,Z
v4
,Z
v5
:
Deviation values between the smallest deviation and the
fifth deviation in the analysis
The corresponding positions are displayed using blue char-
acters on the previous screen.
•
Maximum difference between high and low (Rz)
Stipulated as the “difference between the maximum value Z
max
and the minimum
value Z
min
of the height z, on the analysis screen”.
min
max
Z
Z
Rz
−
=
•
S: Surface area
The net surface area of the analysis plane is computed as the sum of the vector
product of a finely divided surface.
•
S ratio: Surface area ratio
The ratio of the net surface area to the surface area S
0
, which is based on the
assumption that the analysis plane is flat (ideal), is computed.
0
S
S
S
ratio
=
Analysis Results in Line Plot (Table at right center of screen)
Results of analyses in each line plot are displayed.
The type and method of analysis are the same as Single profile.
TMPM5200-2
6-41
