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来源：百度知道 编辑：UC知道 时间：2024/05/23 15:41:09
在电子技术中，频率是最基本的参数之一，并且与许多电参量的测量方案、测量结果都有十分密切的关系，因此频率的测量就显得更为重要。测量频率的方法有多种,其中电子计数器测量频率具有精度高、使用方便、测量迅速，以及便于实现测量过程自动化等优点，是频率测量的重要手段之一。电子计数器测频有两种方式：一是直接测频法，即在一定闸门时间内测量被测信号的脉冲个数；二是间接测频法，如周期测频法。直接测频法适用于高频信号的频率测量，间接测频法适用于低频信号的频率测量。
在数字电路中，数字频率计属于时序电路，它主要由具有记忆功能的触发器构成。在计算机及各种数字仪表中，都得到了广泛的应用。在CMOS电路系列产品中，数字频率计是用量最大、品种很多的产品，是计算机、通讯设备、音频视频等科研生产领域不可缺少的测量仪器，并且与许多电参量的测量方案、测量结果都有十分密切的关系，因此，频率的测量就显得更为重要。
数字频率计是一种用十进制数字显示被测信号频率的数字—测量仪器。通常情况下，利用示波器可以粗略测量被测信号的频率，精确测量就要用到数字频率计。它的基本功能是测量正弦信号、方波信号、尖脉冲信号以及其他各种单位时间内变化的物理量，因此，用途十分广泛。

In the electronic technology, the frequency is one of most basic parameters, and with many electricity parameter's survey plan, the measurement result has the very close relationship, therefore the frequency survey appears more important. The survey frequency's method has many kinds, the electronic counter survey frequency has the precision to be high, the easy to operate, the survey are rapid, as well as is advantageous realizes merits and so on measuring process automation, is one of frequency measurement important means. The electronic counter frequency measurement has two ways: First, the direct frequency measurement law, namely surveys in certain strobe time is measured the signal the pulse integer; Second, indirect frequency measurement law, like cyclical frequency measurement law. The direct frequency measurement law is suitable for the high frequency signal frequency measurement, the indirect frequency measurement law is suitable for the low-frequency signal frequenc