A Scale Factor calibration can be performed using basic components, or with a specifically designed calibration rig available for purchase from One Giant Leap.
The calibration process requires the paddle to be setup in the following way:
Paddle shaft horizontal
Supports located at the approximate blade center and the approximate top hand position
Known calibration weights hung from the approximate bottom hand position
The supports can be as simple as blocks of wood resting upon two separate tables. Two separate tables will allow the space between to be where the weights are hung. Ideally the supports will be narrow so that the load is applied at a point which can be identified and measured to.
The specifically designed calibration rig from One Giant Leap have the supports pivoting on an axis, allowing a broad support surface for the shaft/blade, whilst concentrating the support load to an exact axis.
The calibration rig also includes a hanging hook which can be hung off the shaft at the approximate bottom hand position to hang the calibration weights off. Alternatively, a rope tied to the shaft suspending a bucket will do the job. Weight can be placed into the bucket during the calibration process.
The calibration process requires the strain output to be recorded at various applied loads (minimum of two weight increments and heaviest weight of at least 20kg). The values are then input into the calibration spreadsheet where the scale factors are calculated. The left and right shafts of a kayak power meter are calibrated separately, so the process must be carried out for one of the half shafts, and then repeated for the other.