回差也称仪表的变差。 在仪表全部测量范围内，被测量值上行和下行所得到的两条特性曲线之间的最大偏差。
Backlash in planetary gearing is one of the essentials that affecting the stabilization and sensitivity of servo-loop.
精度、稳定性和灵敏度是伺服系统的三项重要性能指标，而闭环伺服系统的稳定性和灵敏度在很大程度上取决于能否将其中齿轮装置的回差控制在要求的范围内。
参考来源 - NGW行星齿轮减速器回差分析Slewing error is one phenomena that output shaft lag behind input shaft when overturning, which will make turnning relations losted for short time during running and output interrupted suddenly, thus make turnning relations become non-linear.
回差的存在将使摆线针轮行星传动中的输入轴反转时，输入轴与输出轴短时间内失去运动联系，造成输出的突然中断，从而使运动传递关系成为非线性。
参考来源 - FA传动齿形优化和齿面接触状态有限元分析·2,447,543篇论文数据，部分数据来源于NoteExpress
阈值检测器就是一种回差范围较大的锁存电路，与施密特触发器相似。
The threshold detector is similar to a Schmitt Trigger in that it is a latch circuit with a large dead zone.
各路充电电压检测具有“回差”控制功能，可防止静态开关进入振荡状态；
Every charging circuit possesses "backlash" control function which can avoid the vibration of static switch.
计算机模拟结果表明，它具有理想的施密特特性，并可根据需要调整回差。
The result of computer simulation shows that the designed Schmitt inverter has nearly ideal Schmitt function.
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