Atlas Copco STwrench - Page 118

Pset STwrench User Guide
118 (326) 9836 4134 01 Edition 2.9
This filtering eliminates the noise from the trace:
torque / angle samples T
i
and A
i
values
The last 10 T
i
and A
i
values are considered to calculate the following parameters:
- Sum of the torque values =
∑
=
10
1i
i
T
- Sum of the angle values =
∑
=
10
1i
i
A
- Sum of torque values multiplied by angle values =
∑
=
×
10
1i
ii
AT
- Sum of the square of the angle values =
∑
=
10
1
2
i
i
A
From these terms calculated above, linear regression is applied to obtain the gradient of the torque/angle
trace:
Torque
Angle
128 samples →
T
i
and A
i
Torque
Angle
T
1
and A
1
T
2
and A
2
T
3
and A
3