This article bring up error questions exist in experiment of potentialdifferencemeter of gliding line style, analysis the reason, methods of increasing accuracy was given.
提出滑线式电位差计实验存在误差问题并加以分析，给出了提高精确度的方法。
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The principle and the method of making a special power supply for a small, highly stable potentialdifferencemeter are introduced. It finds comprehensive application in college physical experiments.