切断电源检查信号反馈回路是否接通，电压是否正常。

Cut off power supply check signal the feedback loop is switched on, the voltage is normal or not.

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SDC输出的模拟速度信号VEL还可以作为速度反馈信号以构成火炮伺服系统中的速度回路。

Anolog speed signal VEL from SDC is also taken as speed feedback signal to form speed loop in gun servo system.

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本文引用系统主回路分析的新方法—回路增益弹性法对大信号下反馈放大电路的行为特性进行讨论，并通过分析一个二阶反馈放大电路给出一般分析方法和步骤。

In this paper, A new method of system main loop analysis is quoted to analyse the behaviour characteristic of feedback amplifier with large signal, A ordinary analysis method and steps are given.

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