| 摘要 |
An electronically controlled stop watch in which the output frequency of a standard frequency oscillator is divided by a frequency divider means, the divided frequency is counted by a counter means, the starting and stopping of this counting are controlled by a start-stop switch means, and by supplying power to a display means and a register means by the operation of a time display switch means, the content of said counting is displayed in a display device. Preferably a single indicating lamp indicates the off-on condition of a main power switch and also whether or not the counter is counting. The display means is preferably powered by an output of the frequency divider to conserve power. Moreover, reset means is preferably related to the counter control so that the register means cannot be accidentally reset during counting.
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