The article introduces some common fault phenomena of the CA8020 type double oscillograph working and the reasons which cause them provides the measurement of the key and the methods of repair.
介绍CA8020型双踪示波器的常见故障现象及其产生的原因，给出了关键点测量数据和故障处理方法。
The phenomenon of beats can be observed directly on the double-channel oscillograph and the frequency of alternating current can be measured by the vibration curve of the beats.
在双通道示波器上可直观地观测拍现象，并利用拍振动曲线测量交流电的频率。
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