天文测量误差极限：参考星位置对应的最大误差，用角秒表示。
Astrometric Limit: The maximum residual in the place of a reference star, specified in arc seconds.
分析了电子计数器时间间隔法测定电秒表的原理、误差及不稳定性，并且介绍了一种简便的门控法。
This paper analyses principle, error, and unstable state of determining the electric stop watch by means of time-interval method of electric counter. A simple gate-control method is presented at last.
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