对T型电阻网络反馈扩展微弱电流测量原理和测量参数估计方法进行了分析，阐述了该仪器的测量不确定度。
The principle of feedback extension in t resistance network and the estimation method of measuring parameter are analyzed. The indeterminate of the instrument is discussed.
在模态参数估计过程中，仔细选择最好的测量频响通常会得到更好的系统全局极点。
A careful selection of the best measured FRFs will generally produce much better global poles of the system for the modal parameter estimation process.
文中还将改进的实数遗传算法用于测量数据的估计中，得到了较好的线性和非线性参数估计结果。
The new algorithm is also used in parameter estimate, and the results of linear estimate and nonlinear estimate all show the effective of the improved algorithm.
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