TESTING DEVICE FOR MEDICAL CRANKSHAFT ERG OMETERS

A test rig for metrological checks of medical crank-shaft ergometers h as been developed. The mechanical power consumed by the externally dri ven ergometer is obtained with high temporal resolution by measuring t he torque and multiplying it by the instantaneous angular speed. The a ngular speed is obtained from a period measurement performed by an MS- DOS computer with an uncertainty of less than 1 mu s. This principle a llows erratic deviations of the power input to be detected and the tru e mechanical power to be measured, unaffected by reactive power.