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.
本文探讨了对特殊试样更合理的检测方法，也是对仪器性能进行开发，扩展其使用的尝试。
This artical studies more reasonable, measurement models for special samples and it tries to develop the function and the use of the scanner.
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