| 摘要 |
Magnet markers are secured to a vehicle front wheel, and immediately adjacent thereto, secured to the body of the vehicle, there is located a coil sensor. Signals induced in the sensing coil are shaped and fed into an n-stage binary counter. The decoded binary counter output conditions switching logic which interrelates a clock pulse generator and a counter having digital display. Three modes of operation are provided: elapsed time for a quarter mile; acceleration time over a predetermined speed range; and acceleration time from a standing start to a given speed.
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