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可以证明,对于同一台天平,使用的空秤平衡位置L_o不同,用等量砝码测得的天平“不等臂偏差”也不相等。天平的臂长没有变,为什么偏差会发生变化呢?这说明在上述情况下所测得的偏差值,不单纯是不等臂偏差本身,而是它与另一个偏差因素的合成。这另一个偏差因素,就是我们现在要淡的不等感偏差。为了使结论具有普遍性,我们取天平横梁为一般形式,如下图所示。图中,O点代表中刀刃,A点代表左边刀刃,B点代表右边刀刃。从O
It can be proved that for the same balance, the empty balance position L_o used is different, and the balance “unequal arm deviation” measured with the same weight is not equal. The arm length of the balance has not changed, why the deviation will change? This shows that in the above case, the measured deviation value, not just unequal arm deviation itself, but it and another deviation of the synthesis. This is another deviation factor, that is, we now have to wait for the light deviation. In order to make the conclusion universal, we take the balance beam as a general form, as shown below. In the figure, point O represents the middle blade, point A represents the left blade, and point B represents the right blade. From O.