ACTA 4000 User Guide Printouts from ACTA
9836 4171 01 2008-12 117 (136)
Figure 4 Range chart, twenty groups
If Ranges fall outside the control limits, the process should be investigated further.
For further information, please contact your local Atlas Copco representative.
Observe that in Figure 5 some individual measurements fall outside the control interval for group
averages. This may not be a problem since the limits are designed for averages, not individual
measurements. The boundaries are superimposed in Figure 5 to emphasize this point.
0 2 4 6 8 10 12 14 16 18 20
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
UCL
R
=4.08
Index j
Range
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