玻璃度盘是光学测角仪器中的标准器之一,是光学测角仪器决定精度的主要部件,因此对玻璃度盘的刻划精度必须有一个正确的检定。由于仪器的使用场合不同对刻划误差的衡量标准也不同,过去高精度的测角仪器都采用双面读数的办法来提高精度,因此刻划误差的衡量标准都采用直径误差的概念,而不用度盘刻划的位置误差,但随着仪器制造 Glass dial is one of the standard instruments in the optical goniometer and the main part of the optical goniometer to determine the precision. Therefore, the scoring accuracy of the glass dial must have a correct verification. Due to the use of different occasions on the measurement of scribing error is also different from the past, high-precision goniometer instruments are used double-sided reading method to improve accuracy, so the measurement of scoring error using the concept of diameter error, not The dial was scored for position error, but as the instrument was manufactured