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在控制与示警的电路中,常需要在输入参量达到一定值时发出警报讯号或执行某种控制动作,这常是由一个足以驱动继电器的阈电路来完成的。这个电路的鉴别阈在仪器开始烧热时及在长期使用中的稳定度,是整套设备的很重要的指标。为便于测定此性能,我们曾利用下述装置,如图1所示,电容C通过与讯号灯或别的执行机构同时动作的继电器的常通接点α充电,当C上电压达到阈值时,电路即发出讯号,并推动继电器转使C通
In the control and warning circuits, it is often necessary to issue an alarm signal or perform some control action when the input parameter reaches a certain value. This is usually done by a threshold circuit enough to drive the relay. The discriminating threshold of this circuit is a very important indicator of the whole set of equipment when the instrument starts to heat up and its stability over long periods of use. To facilitate the determination of this property, we have used the following device, shown in Figure 1, the capacitor C through the signal light or other actuators simultaneously relay normally energized contacts α charge, when the voltage on C reaches a threshold, the circuit That is the signal, and promote the relay switch to C-pass