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　　机械表手表的走时误差是由地心引力作用造成的，而出厂前对机芯的调校、个人的佩带习惯、周围温度的变化、机芯材质、表油的质量等客观条件会加大或者减小地心引力对走时准确度的影响。世界上没有完全准确的机械表，机械表的准确性也不能与石英表相比。有的朋友说自己的机械表机械表在一段时间内可以分秒不差或者误差很小，这实际上是一天不同佩带方位下正负相互抵消的结果。判断一块表质量的好坏应该看它走时的稳定性，而不应该过分追求零误差。机械表误差分类钟表由于它振动系统的振动周期发生变化而在运行(走时)时产生的快慢变化。通常以日差值(见钟表日差)表示。钟表振动系统的振动周期受各种外部和内部因素的影响而变化，不同影响因素导致不同的走时误差。各种走时误差的综合就构成了钟表走时误差。钟表走时误差的构成，对于机械式钟表，主要有等时性误差、位置误差和温度误差;对于石英电子钟表，主要有温度误差、因电池电压下降和石英振荡器老化所引起的走时误差。石英电子钟表的走时误差通常比机械式钟表至少小一个数量级，即小 10倍以上。 mechanical watches watches the travel time error is caused by gravity, and the objective conditions before movement adjustment, personal wearing habits, the ambient temperature change, core material, form the quality of oil will increase or decrease the effect of gravity on the accuracy of travel time. The world is not completely accurate mechanical table, the accuracy of the mechanical table can not be compared with the quartz table. Some of my friends say their mechanical watches mechanical watches over a period of time to the minute or the error is very small, this is actually a different day wear results cancel orientation. The quality of a table should be judged by the stability of its travel time, rather than the pursuit of zero error. mechanical table error classification clock and watch due to its vibration system vibration cycle changes in the running (travel time) generated by the speed change. Usually expressed in the daily difference (see clock day difference). The vibration period of clock and watch vibration system is influenced by various external and internal factors, and different influence factors lead to different travel time errors. The synthesis of various travel time errors constitutes the error of the time of the clock. A clock error, for mechanical clocks, the main position, isochronous error and temperature error; for quartz electronic watches, mainly when the error caused by the aging temperature error and the battery voltage drops and quartz oscillator. Quartz electronic clocks and watches, the travel time error is usually less than mechanical watches at least an order of magnitude, that is, less than 10 times.