扭簧比较仪的检定周期只有15天。为什么这么短呢?因为作为主要部件的扭簧,在测量时总是处于拉伸或缩短的状态,容易疲劳,时间长了,原有的弹性往往变差,甚至在全部变形中找不到直线段。所以,国家规定扭簧比较仪的检定周期为15天,为的是减少示值超差现 Torsion spring comparator test cycle only 15 days. Why is it so short? Since the torsion spring as a main component is always stretched or shortened during measurement, it is easy to fatigue and takes a long time. The original elasticity often deteriorates, and the straight line can not be found even in the entire deformation segment. Therefore, the state provisions torsion spring comparator test cycle of 15 days, in order to reduce the value of tolerance is shown