The control measurement aims to validate the accuracy of the head. 1 to 3 stems of a single species are felled and bucked. The logs from the selected stems are then measured with an electronic caliper and compared with the measurements from the on-board computer. If the accuracy of the measurements is not satisfactory, corrective action is required.

The accuracy of length and diameter measurements must be adequate.

Perform an inspection of the measurement system components.

If a component of the measuring system is too worn, defective or poorly attached, it is therefore in an unsatisfactory mechanical state.

A corrective action aimed at calibrating the diameter and length sensors. Requires a larger sample than the control measurement: 10 to 20 stems of a single species are required. The logs from the selected trees are then measured with an electronic caliper and the results are sent to the on-board computer. The on-board computer automatically calculates the corrections to be made to the sensors. The operator must accept or reject the proposed changes.

Maintenance of the measuring system components is required if the accuracy is not satisfactory. If, during the next control measurement, the accuracy is still not achieved, calibration is required.