Atlas Copco BLM 3750 - Page 34

Executing a Free Test BLM 3750 User Guide
34 (78) 9836 3078 01 Edition 2.0
The default values of “1
st
%” are set at 50% and of “2
nd
%” at 90%; however, they might be changed to
suit your specific wrenches.
Measurement of the first peak is particularly useful for adjusting the click point of a wrench or evaluating
its Cm-Cmk.
In the production environment, it would be more useful to check the correct use of the wrench,
considering the operator influence and the way in which the tool is actually used. In the second case the
first peak measurement should be left disabled.
If the cut-out remains below the 2
nd
% threshold, it is not considered as valid and the resulting value is the
absolute peak, as shown in the following figure:
If the drop were not as great as to be considered a peak due to the cut-out, the result is the torque of the
absolute peak , as shown in the following figure:
Absolute peak
cut-out
Time
2nd %
1st %
Torque
Absolute peak
cut-out
Time
2nd %
1st %
Torque
Cut-out over
the 2
nd
%.