地震仪器设备的计算机化，单纯依靠线路分析检修十分困难。
Due to computerization of seismic instrument, maintenance of only depending on circuit analysis is very difficult.
本文提出了受控电源视在阻抗的概念和电子线路分析中的视在阻抗法。
The concept of apparent impedance of controlled source and the apparent impedance method for electronic circuit analysis are introduced in this paper.
对电气控制线路分析，PLC 程序设计进行了具体阐述，并分析了改造效果，具有一定的应用价值。
The electrical control circuit and the design of the PLC program were analyzed in detail; it has a certain practice value.
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