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.
介绍了PCS方法测定颗粒平均粒径的不确定度评定方法。
The evaluating method of uncertainty for particle size analysis by photon correlation spectroscopy was introduced.
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