scope:

Objective and scope

The present guideline is generally applicable for torque measurement devices, the torque of which is defined by measuring of the elastic form change of a deformation body or a measured variable which is in proportion to the torque.

This guideline is applicable for the progressive (static) and continuous (quasi-static) calibration of torque measurement devices. Among other things, torque measurement devices for the static calibration of test equipment and torque measurement devices for general applications (e.g. as torque sensors in power screwdrivers or torque transducers in test benches) are the subject. Procedures for the calibration (so-called work calibrations) and for the definition of the measuring uncertainty are given.

Note: For integrated sensors (e.g. sensors fitted in power screwdrivers) only the sensors themselves are covered by this guideline. For inspection of the screwdriver or the screw spindle a capability check of the machine is recommended. See also Section 2.1.

The progressive calibration is a pure static loading of the object to be calibrated. Here the suitable load cycles for each step have to be kept in order to allow for creep effects of the object to be calibrated.

In case of the continuous calibration the object to be calibrated is charged with a continuously changed load. Choose a speed of load application, that excludes the impairment of the calibration result because of dynamic effects.

As the choice of the calibration procedure, the hold times and/or the speed of load application depends on the application of the object to be calibrated, the user of this guideline is responsible for the choice.