用直尺测量长度时,通常在读出最小分度值之后再估计一位,这位估计值虽可估计到最小刻度值的十分之一,但为可靠起见,单次测量中,一般把估计误差定为最小刻度值的一半。用游标卡尺测量时,最后一位数是从游标上读出的,并不需要估计,有的同志便认为它是没有误差的。其实不然,我们知道判断游标与主尺的对准线,是根据相邻三条线的对准程度来确定的,左侧的线在主尺对应线之右,右侧的线在主尺对应线 When measuring the length with a ruler, one bit is usually estimated after the smallest scale value is read. Although this estimate can be estimated to be one-tenth of the smallest scale value, for reliability, in a single measurement, The estimated error is set at half the minimum scale value. When measured with a vernier caliper, the last digit is read from the cursor and does not require estimation. Some comrades consider it error free. In actual fact, we know to determine the alignment of the main ruler and the cursor is based on the alignment of the adjacent three lines to determine the left line in the main ruler corresponds to the line right and right line in the main ruler corresponding line