Press the "reset" key and deletes the zero position error caused by the shift of the zero point in the sensor.
“清零”键，清除传感器因零点飘移而产生的零位误差。
When these two directions are not parallel or perpendicular to each other, the dispersion zero-point shows a shift to the transition frequency of the atom.
当这两个方向不平行或垂直时，色散零点相对于原子跃迁频率发生移位。
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