| 摘要 |
A tachometer comprises a magnet having north and south magnetic poles and a magnetically operated switch for sensing movement of the magnet and for producing an output signal in response thereto. The magnet is supported on one end of a shaft which is supported for rotation in a bearing. The other end of the shaft is threaded into the rotating member, the output of which is to be measured. The bearing is mounted on a plate so that the plate and shaft are independently movable. The switch is mounted on the plate in proximity to the magnet to detect movement of the magnet. The frequency of the output signals produced by the switch indicates the rate of rotation of the rotating member.
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