Abstract
In this study, a new system for the calibration of bicycle ergometers, home trainers and bicycle power monitoring devices is described. This system contains a portable calibration rig as well as a specialised calibration software and is designed for easy and efficient use directly on-site by non-expert personnel. Key features of the calibration rig include a cradle used to implement a torque reaction measurement technique, roller casters, sliding coupling, and crowned splines to facilitate and speed up the calibration process. The maximum power uncertainty delivered by the calibration rig for a nominal power level range of 50–600 W is ±0.9%. A software to guide users through the calibration process and generate calibration charts is described. To illustrate how the calibration system is typically used, the calibration charts of two different brands of home trainers have been obtained, and the power output measurement accuracy of two bicycle power monitoring devices has been determined. Power discrepancies were noted. The results in this study reveal that the calibration system is an effective tool in characterising the behaviour of home trainers.
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