| 有效值法交流共模抑制比测量不确定度评定 |
| Uncertainty evaluation of AC common mode rejection ratio measurement by RMS method |
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| 中文摘要: |
| 为解决影响工业现场的数据采集系统精度的共模干扰问题，以波形分析方式研究了交流共模干扰的表现形式，揭示了其同时含有直流偏移叠加交流波动和本底噪声的典型特征。提出以波形有效值幅度进行干扰强度表征，并进行共模抑制比的定量表述；同时使用有效值叠加模型对系统本底噪声的影响予以剔除，提高了共模抑制比的测量精度。基于该方法与流程讨论了其主要的不确定度来源—信号源误差、数据采集系统增益误差、幅度测量误差、幅度分辨力误差以及测量重复性等。进行了测量不确定度分析和评价，结合实例给出了通道共模抑制比的不确定度评价结果，验证了所述方法的实用性与可行性。 |
| 英文摘要: |
| In order to solve the problem of common mode interference that affects the accuracy of data acquisition system in industrial field, the manifestation of AC common mode interference is studied by means of waveform analysis, and its typical characteristics of DC offset superimposed AC fluctuation and background noise are revealed. It is proposed to characterize the interference intensity by the amplitude of the effective value of the waveform, and quantitatively express the common mode rejection ratio (CMRR). At the same time, the effect of the system background noise is eliminated by using the effective value superposition model, which improves the measurement accuracy of the common mode rejection ratio. Based on this method and process, the main sources of uncertainty, such as signal source error, data acquisition system gain error, amplitude measurement error, amplitude resolution error and measurement repeatability, are discussed. The measurement uncertainty is analyzed and evaluated. Combined with an example, the uncertainty evaluation result of channel CMRR is given, and the practicability and feasibility of the method is verified. |
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| 中文关键词: 计量学 不确定度 交流共模抑制比 评价 校准 数据采集系统 |
| 英文关键词:metrology uncertainty AC CMRR evaluation calibration data acquisition system |
| 基金项目: |
| DOI：10.11823/j.issn.1674-5795.2023.02.04 |
| 引用本文：梁志国, 冯秀娟.有效值法交流共模抑制比测量不确定度评定[J].计测技术,2023,(2):. |
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