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各电视台的播出机房或重要的制作机房都设有主、备二套同步系统。一旦主同步机发生故障,可立即用手启动同步切换器,使继电器脱离主同步信号,将备机信号送出。但是,当问题出现的时候,值班员往往很难立即断定故障所在,从而不能使问题迅速得到解决(有时还会发生误判断和误操作现象)。而且,平时主机处在正常工作状态
The broadcasters’ rooms or important production rooms in each TV station are equipped with main and secondary synchronization systems. Once the main synchronous machine fails, you can immediately start the synchronous switch by hand, so that the relay from the main synchronization signal, the preparatory machine signal sent. However, when a problem arises, it is often difficult for the attendant to determine the cause of the problem immediately, thereby preventing the problem from being resolved promptly (and sometimes misjudgment and misuse). Moreover, usually host in normal working condition