The clock measures the passage of time in millionths of a second by counting the frequency of electromagnetic waves.
这种钟表通过电磁波的频率来计算时间，单位为百万分之一秒。
2
This is the basis for the well - known cesium clock, presently the standard of frequency and time.
这就是众所周知的铯原子钟的基础，它是目前的频率和时间基准。
3
A new tool that can test the clock base frequency error of energy measuring devices and provide GPS standard time to calibrate real-time clock was introduced in this paper.