我们做一个小实验,把一块尺寸较大的量块放在光学计测头下面,对好零位,然后用手接触量块,手的温度传到量块上,这时从目镜中观察到刻度尺寸上的读数迅速增大,一两分钟内甚至会增大几个微米。实际工作中有时发现各次检测结果相差很大,常常是因为温度发生变化的缘故。在国家检定规程中,对检定 Let’s do a little experiment, put a piece of larger size on the underside of the optical measuring head, make a good zero, and then touch the measuring piece by hand, the temperature of the hand is transferred to the measuring piece, then observed from the eyepiece The readings on the scale quickly increase, even a few microns in a minute or two. The actual work sometimes found that the test results vary greatly, often because of temperature changes. In the national test procedures, the test