简易数字频率计的设计3.1被测信号波形：正弦波、三角波和矩形波.3.2 测量频率范围：分三档：1Hz~999Hz0.01kHz~9.99kHz0.1kHz~99.9kHz3.3 测量周期范围：1ms~1s.3.4 测量脉宽范围：1ms~1s.3.5\x05测量精度：

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