| 摘要 |
A system for measuring the amount of area traversed by a vehicular implement comprising linear distance measuring means for generating an electrical signal having a characteristic which varies systematically in accordance with the distance traversed by the implement. An electronic switch having a first switching state and a second switching state is utilized for developing a control signal having a first value when the switch is in the first state and a second value when the switch is in the second state, with the electronic switch being coupled to the electrical signal generator and responsive to the electrical signal for switching to the first switching state. A clock is responsive to the control signal being in the first state and having the first value for generating a timing signal having a predetermined frequency. A pair of presettable dividers are coupled to the clock for developing a switching signal which is applied to the electronic switch to switch it to the second switching state. A counter is coupled to the clock for counting the total number of cycles of the timing signal during the period of time that the electronic switch is in the first switching state and developing a corresponding area signal. A visual display is responsive to the area signal for visually displaying to the operator the value of the area signal so that the operator can quickly see the total area covered by the implement during a given period of time.
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