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本测试器不仅可以检测还可以产生方波脉冲信号。产生的测试信号可以是连续的,也可以是预置时间内的脉冲串,电路如图所示。 IC2及其周围元件组成脉冲信号检测器。从接线座K3输入的1kHz～10MHz脉冲信号经IC2除以1024后,使蜂鸣器BZ1发出1Hz～10kHz的声音。 双定时器IC556(IC1)及其周围元件组成脉冲信号发生器。其中,IC1a接成单稳触发器,其单稳态时间可用P1最大调到1秒钟。每按下一次开关S1,IC1a就输出一个最大宽度为1秒的方波脉冲。当开关S2置于“BURST”位置时,此方波脉冲通过S2加到IC1b的复位端,使IC1b在P1置定的时间内产生一个脉冲串。IC1b接成频率可变的脉冲
This tester can not only detect but also generate square wave pulse signal. The generated test signal can be continuous, or it can be a burst within a preset time, the circuit shown in the figure. IC2 and its surrounding components form a pulse signal detector. When the pulse signal of 1kHz ~ 10MHz input from the connector K3 is divided by 1024 by IC2, the buzzer BZ1 emits the sound of 1Hz ~ 10kHz. Dual timer IC556 (IC1) and its surrounding components form a pulse generator. Among them, IC1a connected as a single-shot trigger, the monostable time available P1 maximum transferred to 1 second. Each time switch S1 is pressed, IC1a outputs a square wave pulse with a maximum width of 1 second. When switch S2 is set to the “BURST” position, this square pulse is applied to the reset terminal of IC1b via S2, causing IC1b to generate a burst at P1’s set time. IC1b then variable frequency pulse