文件名称:GM
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用74系列数字器件设计一个频率计。要求：
① 用4位7段数码管显示待测频率，格式为0000Hz。
② 测量频率范围：10~9999Hz。
③ 测量信号类型：正弦波、方波和三角波。
④ 测量信号幅值：0.5~5V。
⑤ 设计的脉冲信号发生器，以此产生闸门信号，闸门信号宽度为1S。
-74 series of digital devices designed to use a frequency counter. Requirements: ① with four 7-segment LED display tested frequency, the format is 0000Hz. ② Measuring frequency range: 10 ~ 9999Hz. ③ measurement signal types: sine wave, square wave and triangular wave. ④ measuring signal amplitude: 0.5 ~ 5V. ⑤ design of pulse signal generator, used to produce a gate signal, gate signal width 1S.
① 用4位7段数码管显示待测频率，格式为0000Hz。
② 测量频率范围：10~9999Hz。
③ 测量信号类型：正弦波、方波和三角波。
④ 测量信号幅值：0.5~5V。
⑤ 设计的脉冲信号发生器，以此产生闸门信号，闸门信号宽度为1S。
-74 series of digital devices designed to use a frequency counter. Requirements: ① with four 7-segment LED display tested frequency, the format is 0000Hz. ② Measuring frequency range: 10 ~ 9999Hz. ③ measurement signal types: sine wave, square wave and triangular wave. ④ measuring signal amplitude: 0.5 ~ 5V. ⑤ design of pulse signal generator, used to produce a gate signal, gate signal width 1S.
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