灵敏电流计内阻测量的误差及消除

灵敏电流计内阻是灵敏电流计的一个重要参数,其测量要求非常精确,但用通常的测试方法测得的结果却很不准确.为此,通过对测量线路的灵敏度及电流计零点漂移现象的分析,指出灵敏电流计内阻测量误差的产生,主要由于测量过程中线路的灵敏度和由电流计温差电动势引起的零点漂移不稳定而造成的,并采用了相应的消除方法.结果表明,测量方法改进后,可以得到比较理想的测量结果.

Measurement Error and Elimination of SensitiveGalvanometer Internal Resistance

The internal resistance is an important electrical parameter of the sensitive galvanometer.It requires to be measured precisely,however,the common measuring method cannot give an accurate result.By analyzing the sensitivity of the measuring circuit and the zero-point drift of the galvanometer,it is shown that the reason causing measurement errors is mainly due to the instability of circuit＇s sensitivity and zero drift caused by thermo-electromotive force.Finally,some improved methods for eliminating the error were given,and the experimental result shows that the more ideal measarement result can be obtained.