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当测长机、万能测长仪的内测钩测头错位时,将使被测件被测尺寸方向与仪器刻度方向有夹角,从而产生测量误差。此误差随着被测尺寸大小的不同而迅速地改变着,一般情况下,其值的大小已达0.001甚至0.01的数量级,绝不能作为二阶误差而被忽略,其测量结果必须加以修正。一、测试误差的计算设内测钩测头在垂直方向上的错位量为△(?)(即常称的高矮差),在水平方向上的错位量为△_x(即常称的前后不齐差),则测头的实际错位量—空间错位量为:△=(△_x~z+△_x~z)~(1/2)(1) 参见图1。由于测长机、万能测长仪均具有万能工作台,工作台的调整运动,便可以找到测头接触的返回点。也就是通过对载物工作台的调整,
When the length measuring machine, universal length measuring instrument of the measuring hook probe misalignment, will be measured by the measured size direction and the direction of the instrument has an angle, resulting in measurement error. This error varies rapidly with the size of the measured size. Under normal circumstances, its value has reached the magnitude of 0.001 or 0.01. It must not be neglected as a second-order error and the measurement result must be corrected. First, the calculation of test error Suppose the hook probe in the vertical displacement of the amount of △ (?) (Commonly known as the height difference), the amount of horizontal displacement in the amount of △ _x The difference of the actual displacement of the probe - the amount of spatial misalignment is: Δ = (△ _x ~ z + △ _x ~ z) ~ (1/2) (1) See Fig.1. As the length measuring machine, universal length measuring instrument has a universal table, table adjustment exercise, you can find the return touch probe contact. That is, through the adjustment of the load table,