大家知道,评价测量精度的大小,要看测量误差占被测尺寸的多少而定。被测的尺寸越小而测量的误差越大,则测量结果的精度越低。在测量误差一定(测量工具已确定)的条件下,怎样使小尺寸的测量具有较高的测量精度呢?采用扩展法是一个简捷的途径。一些很小的尺寸,例如某些宽度为0.01～0.03毫米的刻线,在工具显微镜上很难把它们 We all know that the size of the evaluation of measurement accuracy depends on the measurement error of the size of the measured. The smaller the measured size and the larger the measured error, the lower the accuracy of the measurement result. In the measurement of a certain error (measurement tools have been identified) under the conditions, how to make small-size measurement with high accuracy? The use of expansion method is a simple way. Smaller dimensions, such as engravings with widths of 0.01-0.03 mm, are difficult to use on a tool microscope