| 摘要 |
PCT No. PCT/EP88/00957 Sec. 371 Date Jun. 21, 1989 Sec. 102(e) Date Jun. 21, 1989 PCT Filed Oct. 25, 1988 PCT Pub. No. WO88/03709 PCT Pub. Date May 5, 1989.A method and device for measuring the string tension of a strung racket such as a tennis racket wherein a mechanical/electrical transmitter is attached to the membrane made from the racket strings mounted crosswise onto a frame and measures the frequency of the membrane. The membrane is induced to freely oscillate in an aperiodically (non-periodically) manner by a light stroke onto the frame or by dropping a ball onto the membrane. The measured frequency is proportional to the string tension which is indicated by a display.
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