Atlas Copco ACTA 3000

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Min Max
Figure 9 High CM and CMK
9.4 ISO 5393 calculations
The parameters presented during an ISO5393 calibration are calculated as follows.
The combined mean torque
comb
T
is calculated as
() ()
2
dc, oflower ba,ofhigher +
=
comb
T
where
LL
HH
LL
HH
Td
Tc
Tb
Ta
σ
σ
σ
σ
3
3
3
3
−=
−=
+=
+=
and
H
T is the mean torque on the high torque rate joint,
L
T is the mean torque on the low torque rate
joint,
H
σ
3± and
L
σ
3± is the 6-sigma multiple limits for the hard and soft torque joints respectively.
The mean shift is calculated as
LH
TT −
The combined torque scatter
Comb
T
Δ
is calculated as
() ()
dcbaT
comb
,oflower ,ofhigher −=Δ