基于增量模型的变极性测量方法的研究和应用

测量微弱的电压信号时。测量系统中热电势的影响不能忽略。本文所讨论的基于增量
模型的变极性测量方法是消除测量系统中热电势干扰的一种处理方法。这种方法将一个完整的测量过程分为三步，在测量过程中，间隔地变换激励电流的极性。测量数据经过处理后，得到待测电压的测量值。理论和实践均表明，利用该方法可以有效地去除测量系统中绝大部分由于温度变化而引起的热电势的变化对测量结果的影响，提高测量精度。
关键词：增量模型，变极性方法，热电势
Research and Application of the Alternating Polarity Method based on
Increment model JIANG XIAOPING（Beijing Campus, China University of Mining and Technology, BEIJING 100083） Abstract: In low voltage measurements, the resulting voltage will be very small and great care needs to be taken to reduce offset voltage and noise. A new Alternating Polarity method based on increment model is researched in this article. With this method, one measurement is divided into three steps, and the polarity of test current is alternated during measurement..A correlative method is treated with these test data for the
final reading. Both theory and practice indicate this method clearly offers significant advantages over other low voltage measurement techniques in overcoming error due to changing temperature.
Key words: Increment model, Alternating Polarity Method, Electromotive Force