作为另一个示例，选择信号的逻辑状态可响应于提供给脉冲频率检测器的电源电压的变化而改变。
As another example, the logic state of the select signal can be changed in response to a change in the power supply voltage provided to the phase frequency detector.
选择性漏电保护是指当电网发生漏电故障时，能够有选择地发出故障信号或切断故障支路电源，而非故障部分继续工作。
The selectivity leakage protective system can give out alarming signal or cut off the fault branches selectively when the leakage fault happens, and the non-fault branches are working normally.
它也有放大器的电源，并且它也许有过载信号器放大器作为选择。
It also has a power supply for the amplifiers and it may have an accelerometer amplifier as an option.
选择性漏电保护是指当电网发生漏电故障时，能够有选择地发出故障信号或切断故障支路电源，而非故障部分继续工作。
The selective leakage protective system can give out alarming signal or cut off the fault branches selectively when the leakage fault happens, and the non-fault branches are working normally.
如果电源电压减小，则选择信号的状态从逻辑高改变为逻辑低。
If the power supply voltage decreases, the state of the select signal is changed from a logic high to a logic low.
打开放大器电源，选择节目信号源。
打开放大器电源，选择节目信号源。
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