数字频率计是计算机、通讯设备、音频视频等科研生产领域不可缺少的测量仪器。它是一种用十进制数字显示被测信号频率的数字测量仪器。它的基本功能是测量正弦信号，方波信号及其他各种单位时间内变化的物理量。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，测量迅速，精确度高，显示直观，经常要用到频率计。-Digital frequency meter is the computer, communications equipment, audio, video and other areas of scientific research and production of measuring instruments are indispensable. It is a decimal figures show the number of the measured signal frequency measuring instruments. Its basic function is to measure the sinusoidal signal, square wave signals and other physical changes in unit time. During simulation, digital circuit design, installation, commissioning process, because of its use decimal numbers show that rapid measurement, high precision, intuitive display, often use the frequency counter