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在信号电路应用中,往往既存在着模拟关系,又存在着数字关系。以轨道电路为例,从逻辑分析角度看,GJ↓表示轨道区段占用,GJ↑表示轨道区段空闲,即轨道电路表现的是一种逻辑关系；从电路特性来看,完全是一种模拟量的变化关系,整个电路在逻辑状态没有发生变化的情况下,其电气特性会发生某种变化,比如轨道继电器端电压从20V跳变到17V,此时,并没有产生逻辑关系的变化,但电路系统已经发生了变化,如果能够及早注意或发现这种变化,就会将轨道电路故障消灭在萌芽状态。
In the signal circuit applications, there are often both analogue and digital relationships. Taking the track circuit as an example, from the point of view of logic analysis, GJ ↓ means that the track section occupies, GJ ↑ means that the track section is idle, that is, the track circuit shows a logic relationship; from the circuit characteristics, it is a simulation The relationship between the amount of changes in the entire circuit in the logic state has not changed circumstances, some changes in its electrical characteristics, such as rail relay terminal voltage jump from 20V to 17V, at this time, did not produce a logical change, but The circuit system has changed, and if the change can be noticed or discovered early, the failure of the rail circuit will be eliminated.