A Scale Factor Calibration can be performed using basic and easily sourced components, or with a specifically designed calibration jig available for purchase from One Giant Leap. There is also the option to have the calibration jig manufactured yourself; the profile cut part files and assembly instructions are available here to download.
The calibration process requires the paddle to be setup in the following way:
Paddle shaft horizontal
Paddle assembled with the offset angle set to 90degrees Right Hand Twist
Supports located at the approximate blade centre and top hand positions
Calibration weights (with known weight) hung from the approximate bottom hand position
The supports can be as simple as blocks of wood resting on two separate tables. The space between the two tables is where the calibration weights will hang. Ideally the supports will have narrow width so that the paddle is supported at a definite spot which can be identified and measured. The calibration weight can be applied by suspending them from the shaft with a rope.
The calibration process requires the strain output to be recorded with at least 2 different calibration weights (heaviest weight at least 20kg). The values are then input into the calibration spreadsheet where the scale factors are calculated. The right and left shafts of a kayak power meter are calibrated separately, so the process must be carried out on the right shaft and then repeated for the left.