To contrast with the real clock and find the reason which cause the error and give the arithmetic which can minimize error, then lets the clock meet the need of production.

• 对比实际的时钟，查找出误差的来源，并作出调整误差的方法，使得误差尽可能地小，使得系统可以达到实际数字钟的允许误差范围内。