測(cè)量微弱的電壓信號(hào)時(shí)。測(cè)量系統(tǒng)中熱電勢(shì)的影響不能忽略。本文所討論的基于增量
模型的變極性測(cè)量方法是消除測(cè)量系統(tǒng)中熱電勢(shì)干擾的一種處理方法。這種方法將一個(gè)完整的測(cè)量過(guò)程分為三步，在測(cè)量過(guò)程中，間隔地變換激勵(lì)電流的極性。測(cè)量數(shù)據(jù)經(jīng)過(guò)處理后，得到待測(cè)電壓的測(cè)量值。理論和實(shí)踐均表明，利用該方法可以有效地去除測(cè)量系統(tǒng)中絕大部分由于溫度變化而引起的熱電勢(shì)的變化對(duì)測(cè)量結(jié)果的影響，提高測(cè)量精度。
關(guān)鍵詞：增量模型，變極性方法，熱電勢(shì)
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