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本文对石英钟表的日差测试原理进行了探讨，并具体阐述了一种基于ＡＴ８９Ｃ２０５１单片机的钟表校验仪的原理、电路的实现以及控制软件的设计。
In this paper, the principle of day-to-day test of quartz watch is discussed, and a principle of circuit calibrator based on AT89C2051 single-chip microcomputer, the realization of circuit and the design of control software are described in detail.