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对于一般的电子学实验室及科研单位,通常使用拥有以石英晶体振荡器为频率基准的电子通用计数器及数字频率计等测量仪器。随着使用时间的延长及其他种种原因,石英晶体振荡器的精度会下降,因而客观上需用另一高精度的频标随时对它加以调整并确定其时间频率的误差。利用彩色电视副载波信号进行频率标准的传递,是近年来发展起来的新技术,它可以相当经济简便地解决校频和比对问题。从80年代初开始,我国开始采用以铯原子频标控制中央电视台的彩色副载波信号。这样,在实时接收中央电视台的节目时,只要用户的彩色电视机工作稳
For general electronics laboratories and research institutes, usually have to use quartz crystal oscillator frequency-based electronic universal counter and digital frequency meter and other measuring instruments. With the extension of the use of time and other reasons, the accuracy of the quartz crystal oscillator will decline, and therefore objectively need to use another high-precision frequency standard at any time to adjust it and determine the error of time and frequency. The use of color TV subcarrier signals for frequency standard transmission is a new technology developed in recent years, it can be quite economical and easy to solve the problem of frequency and alignment. From the early 1980s, China began to use the Cesium atomic frequency control of CCTV color subcarrier signal. In this way, when receiving the program of CCTV in real time, as long as the user’s color TV is working steadily