Causes for safety accidents were analysed, with summary on the method for its correct use and key points and evaluation analysis for the uncertainty of site voltage measurement.

分析了其安全事故发生的原因，总结了对其正确使用的方法和要点，并对现场电压测量的不确定度进行了评定分析。

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The paper studies the measurement system and uncertainty. Based on the analysis of system and the source of error, the paper does the uncertainty evaluation and accuracy undertaking.

文章通过对测量系统及其不确定度的研究，分别基于测量系统分析和误差溯源对测量系统进行了不确定度评定和精度保证。

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Based on the rational simplification for type a and B evaluation of general uncertainty, this paper confirms the general certainty, and introduces their applications.

在对总不确定度的A类分量及B类分量评定的合理简化的基础上，确定了总不确定度的表示模式，并介绍了它们的应用。

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