This article bring up error questions exist in experiment of potential difference meter 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。
The principle and the method of making a special power supply for a small, highly stable potential difference meter are introduced. It finds comprehensive application in college physical experiments.
本文介绍了一种小型高稳定电位差计专用电源的原理及制作方法。该电源在大学物理实验中具有较广泛的使用价值。
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