瞬态干扰示波器测试方法研究

Research on Test Method of Transient Disturbance

为快速准确定位电气电子设备内部电路信号受到的瞬态干扰,可使用普及范围较广的示波器进行测试。针对电气电子内部电路信号瞬态干扰波形的特殊性,即高频含量丰富,空间辐射影响强烈,测试结果准确度和可信度低,对两单端探头矢量差法和差分探头直接测量法进行了分析测试。说明了相应的布线措施,并进行仿真对比验证,取得了良好的测试效果。提出了简单易行的布线指导原则,同时在不具备差分探头情况下,用文中给出的相关布线方式,使用共模探头同样能够取得良好的测试结果。

For fixing on the coupling disturbance waveform of the signal circuit well and truly, using oscillograph directly to measure the waveform is the best intuitionistic test method. But the transient disturbance rises fast including much high frequency energy. And the high frequency parts can emit through the space. The test results become suspect. This paper offers a few items for the configuration of the oscillograph and the connection lines of the single-ended probe ＆ differential probe. Following the configuration rules, we achieved satisfying test results with the two test methods.