喀呖声的识别方法探讨

Discussion on the Identification Method of Click

为避免产品EMC测试中的误判,有效识别固定频点150 kHz、500 kHz、1.4 MHz、30 MHz之外的喀呖声骚扰与连续骚扰十分重要。文章阐述了家用电器电磁骚扰发射中的连续骚扰与断续骚扰的差异、喀呖声的检测方法及判定原则。通过典型实例对喀呖声骚扰进行了频域和时域的波形及数据分析,探讨了四个固定频点之外的喀呖声骚扰识别方法——重复测量法、示波器观测法、频谱仪时域观测法。分辨方法简单有效,实验室检测人员可根据条件选取合适的方法,对喀呖声骚扰进行准确的判别。

It is very important to effectively identify click and continuous disturbance outside the frequency of 150 kHz、500 kHz、1.4 MHz、30 MHz to avoid misjudgment in product EMC testing.The paper expounds the difference between continuous disturbance and discontinuous disturbance in electromagnetic disturbance emission of household appliances,the click measuring method and determination principle.Through the waveform and data analysis of typical example in frequency domain and time domain,the identification methods of click outside the above four fixed frequency points-repeated measurement,the oscilloscope observation,spectrum analyzer time domain observation are discussed.These methods are simple and effective,the laboratory can select appropriate methods according to the conditions to effectively identify click.