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General information on calibration
General information on
calibration
If no internal test equipment monitoring procedures
are available, the calibration interval defined in the
standard applies. Calibration should then take place
twelve months after initial usage or after around
5000 load cycles.
Prior to calibration, perform a function check and
visual inspection to rule out damage to the torque
wrench.
Only perform calibration at an ambient
temperature of 23 °C ±5 °C. If the ambient
temperature lies outside of the tolerance, take this
into consideration on evaluation of calibration.
Make sure that the torque wrench to be calibrated
is able to acclimatise sufficiently to the ambient
temperature.
On use of special plug-in tools, please note
dimension SF and adapt the torque wrench
settings according to the conversion formula
specified here.
In the case of plug-in tools with a spring-loaded
ball or pin, align the tool so that it points away
from the handle.
Note all dimensions which deviate from the
standard (SF and LF) in the calibration certificate.
Position the torque wrench in the calibration
facility so that it is aligned ±3° horizontally.
Make sure that the torque wrench lies free of
tension and without force in the calibration facility.
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The dimension SF is the standard extension length
of the plug-in tools which are used.
The dimension LF is the lever arm to be used
during calibration, measured from the centre of the
bolt head (centre of the transducer).
LF=function length
SF=standard extension length
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