Atlas Copco BLM 3750 - Page 33

BLM 3750 User Guide Executing a Free Test
9836 3078 01 Edition 2.0 33 (78)
When testing a click wrench, the cut-out may not be sufficient to warn the operator of the obtained torque
and thus the joint may undergo a further increase in torque. By using a peak torque detector, only the first
drop in torque is considered, and subsequent values are disregarded: Even if force continues to be applied
to the wrench after the cut-out, only the peak value of the trigger is recorded.
First peak enabled First peak disabled
The first peak is measured if there is a drop in torque (due to the cut-out of the clutch); the drop must be
less than the “2nd %” and over the percentage the “1
st
%” and shown in the following figure:
cut-out
Time
maximum torque
Torque
cut-out
Time
Torque
cut-out
Time
Torque
Maximum torque
2nd %
1st %
Cut-out below the 2
nd
%.
And over the 1
st
%.
Test result
Test result