A device for measuring and indicating network faults in the case of sports balls that are equipped with flying, in particular tennis

摘要

The measuring and indicating system has at least two sensors (1,3), arranged on the net edge, symmetrically to the centre of the net or to the net regulating strip (2). Each sensor has at least one shock sensor and an electronic circuit which converts the ball-net contact to an electrical value. The electrical output signals are amplified and with a low ohmic value are led for further processing. Each sensor has its own electronic signal processing circuit allocated inside the evaluation unit (6). The output signals control a common electronic indicating panel, across an OR-logic gate unit.