求翻译：数字频率计是一种专门对被测信号频率进行测量并且直接用十进制数字来显示测量值的电子测量仪器，是计算机、音频视频、通讯设备等科研生产领域不可或缺的测量工具。它不仅能够测量正弦信号，方波信号等周期性信号的频率和周期，而且还能对其他多种物理量的变化频率进行测量，这些物理量的变化情况可以通过相应的传感器转变成周期性变化的电信号，然后用数字频率计测量单位时间内信号脉冲变化的次数，再用数码管显示出来。在进行模拟、数字电路的设计、安装、调试过程中，由于其使用十进制数显示，具备了测量迅速，精度高，显示直观等优点，所以经常被投入使用。是什么意思？

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It is a digital frequency meter that is designed to test signal frequency is measured and used directly for decimal numbers 10 shows the measured value to the electronic measuring instruments, computer, video and audio, communications equipment, and other essential areas of scientific research and p

Digital frequency meter is a special measure on the measured signal frequency and direct use of decimal numbers to display the measurement value of electronic measuring instruments, computers, audio, video, communication equipment and other a