电光分析天平在检定过程中，变动性产生原因很多，而且处理起来较难，精度越高越容易出现变动性。在排除外界环境因素的影响（温度、湿度、振动），造成天平的示值变动性，就是天平本身的问题。1 横梁上三刀产生的原因刀子是天平的关键部件，看是否有锯齿、凹状或凸状引起的变? Electro-optical analysis balance in the verification process, there are many reasons for the variability, but also difficult to deal with, the higher the accuracy of the more prone to change. Excluding the impact of external environmental factors (temperature, humidity, vibration), resulting in the balance of indication variability, it is the problem of the balance itself. A beam on the three knife causes Knife is a key component of the balance to see if there are serrated, concave or convex caused by the change?