According to the application comprehensive of the shield, equipotential bonding and surge protective device, the combination protection of the automatic system is realized.
综合应用屏蔽、等电位连接和电涌保护器等基本防护措施，实现了自动化系统的雷电综合防护。
But to perfect the system performance, some accessorial circuits are necessary, such as automatic power control circuit, automatic temperature control circuit and protective circuit etc.
为了完善通信系统的性能，除了主干电路外，还必须加入一些附加电路，如自动功率控制电路、自动温度控制电路和保护电路等等。
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