大多数开关主机都可通过触发输入进行外部触发，并且在继电器触点稳定之后可输出一个触发脉冲。
Most switch mainframes can be triggered externally via the trigger input and can send an output trigger pulse when the relay contacts have settled.
当选择自动增益方式时，增益的改变通过增益同步脉冲触发，触发脉冲可由系统内部周期产生或外部提供。
When the former was chosen, the change of gain would come true by the synchro pulse, which was supplied by the cycle inside the system or outside the system.
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