A static calibration is used for some ergometers to check the assumed linear relationship between 2 workload points with use of weights. This type of calibration is not accurate because the driving gear is not taken into account and the relationship is not totally linear at higher and lower workloads. Historically mechanical ergometers are calibrated by this method the accuracy is shifting a lot between tests because the belt-length (mechanical braking part) is influenced by heatening. Static calibration is not fulfilling any relevant norm. Dynamic calibration is performed by a service engineer with a calibrator. The ergometer is calibrated at the axis in the total workload and rpm range (instead of 2 points without any movement of the driving gear). The data can be compared with the initial calibration report from the factory to check drifting in time. A calibration report is printed for the customer and stored by the service engineer. Dynamic calibration performed with a Lode calibrator is accurate and fulfills all relevant norms and certifications.