measuring the frequency by counting
measuring the frequency by counting
通过计数来测量频率
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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Based on pulse counting principle, the high precision time interval can be obtained by measuring the number of the high-frequency reference clock through it.
设计了一种高精度时间间隔测量模块，该模块由单片机控制，采用脉冲计数原理，通过测量时间间隔内高频参考时钟个数，得到被测时间间隔的精确值。
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