Atlas Copco Power Focus 3000 User Manual

Statistic
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32
,DA
and
4
D
are tabular constants and depend on the subgroup size.
19.6 Constants for calculation of SPC variables
Sub group
size
Divisors for
estimation of
standard div.
Factors for control limits
N
D
2
C
4
A
2
D
3
D
4
A
3
B
3
B
4
2
1.13
0.798
1.88
-
3.27
2.66
-
3.27
3
1.69
0.886
1.02
-
2.57
1.95
-
2.57
4
2.06
0.921
0.73
-
2.28
1.63
-
2.27
5
2.33
0.940
0.58
-
2.11
1.43
-
2.09
6
2.53
0.952
0.48
-
2.00
1.29
0.03
1.97
7
2.70
0.959
0.42
0.08
1.92
1.18
0.12
1.88
8
2.85
0.965
0.37
0.14
1.86
1.10
0.19
1.82
9
2.97
0.969
0.34
0.18
1.82
1.03
0.24
1.76
10
3.08
0.973
0.31
0.22
1.78
0.98
0.28
1.72
11
3.17
0.975
0.29
0.26
1.74
0.93
0.32
1.68
12
3.26
0.978
0.27
0.28
1.72
0.89
0.35
1.65
13
3.34
0.979
0.25
0.31
1.69
0.85
0.38
1.62
14
3.41
0.981
0.24
0.33
1.67
0.82
0.41
1.59
15
3.47
0.982
0.22
0.35
1.65
0.79
0.43
1.57
16
3.53
0.984
0.21
0.36
1.63
0.76
0.45
1.55
17
3.59
0.985
0.20
0.38
1.62
0.74
0.47
1.53
18
3.64
0.985
0.19
0.39
1.61
0.72
0.48
1.52
19
3.69
0.986
0.19
0.40
1.60
0.69
0.50
1.50
20
3.74
0.987
0.18
0.42
1.59
0.68
0.51
1.49
21
3.78
0.988
0.17
0.42
1.58
0.66
0.52
1.48
22
3.82
0.988
0.17
0.43
1.57
0.65
0.53
1.47
23
3.86
0.989
0.16
0.44
1.56
0.63
0.55
1.46
24
3.90
0.989
0.16
0.45
1.55
0.62
0.56
1.45
25
3.93
0.990
0.15
0.46
1.54
0.61
0.57
1.44

Atlas Copco Power Focus 3000 Specifications

General

Brand	Atlas Copco
Model	Power Focus 3000
Category	Control Systems
Language	English