Atlas Copco Power Focus 3000 User Manual

Statistic
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19.5 Calculation formulas
When a stat display is requested, the whole memory is calculated. This is also done when shifting Pset.
Power Focus controls the lowest and highest values. If some of these drop out from memory once it is full
(first in – first out), the entire memory is recalculated.
The formula for group range is calculated after each completed subgroup.
The formulas for the statistic parameters used by Power Focus:

i
X
= value
 n = number of tightenings
 Min = minimum value from all the tightenings in the Power Focus memory
 Max = maximum value from all the tightenings in the Power Focus memory
 minl = minimum acceptable value
 maxl = maximum acceptable value
Range R Max Min  









n
i
i
X
n
XMean
1
1


















2
1
2
1
1
1
xnX
n
n
i
i
n
s

CR
Maxl Minl


6* 
CP
Maxl Minl


6* 








 *3
,
*3
min
MinlXXMaxl
CPK
Tightenings
1
X
2
X
3
X
4
X
5
X
6
X
7
X
8
X
9
X
10
X

Atlas Copco Power Focus 3000 Specifications

General

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