The torque transducer should preferably be calibrated in three different mounting positions
with the transducer or its mechanical coupling part rotated each time through 120° about
the measurement axis. Four relative mounting positions can be used for a square drive.
(see Annex D). For transducers with accuracy of 1% or less calibration 0 and 90° may be
sufficient (Annex D Fig. 4).
Two incremental calibration series are required at the same mounting position, normally at
the start of calibration, for determination of repeatability.