分析影响系统测量精度的各项因素，完成系统不确定度的评定。
The article Analyses the factors of influence system measuring accuracy and en the evaluation of system uncertainty is completed at last.
试验结果证明了气动电磁阀工作非对称性是换向器系统不确定度的主要来源。
The tests show that the asymmetry of the pneumatic electromagnetic valve is the primary factor forming uncertainty of changeover system.
对基于频谱分析仪的相位噪声测试原理和方法进行了介绍，并对引起测试系统不确定度的因素及其评定方法进行了讨论。
This article introduces the principle and method how to measure phase noise with spectrum analyzer, and discusses the uncertainty factor and its evaluating method.
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