On the basis of experiments now in Experiment of College Physics, the basic range of direct current digital voltmeter is expanded by refit and then the voltmeter is calibrated.

• 摘要在现有电表改装与校准实验基础上，对三位半数字电压表的基本量程进行扩程改装，实现多量程接入，并对改装电压表进行校准。