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随着数字电路和微型计算机的广泛应用,对它们的维修和排障的任务越来越繁重,要求建立一种迅速而有效的检测手段是很自然的.逻辑探头就是基于这种需要产生的一种检查数字电路并能够给出视觉显示的测试工具,与其它复杂仪器如示波器、逻辑分析仪等相比,它有价格低廉、使用简单、携带方便等优点.在检查电路时,常能收到异曲同工之效果.某些在示波器上难于观察的情况,如短暂的、重复频率低的脉冲(通常对宽度小于10ns的脉冲,逻辑探头将它展宽到50ms再去推动LED)、计算机中三态逻辑的高阻状态等使用逻辑探头是有其独到的好处.逻辑探头可以检测DTL、TTL、MOS、CMOS及微处理器等多种器件.检测时用它的探针接触被测电路的结点,则其相应的LED就会指出该点的逻辑状态:高电平、低电平、开路或脉冲.逻辑探头本身不具有电源,使用时逻辑探头接在被测电路的电源上,因而可以将它像钢笔那样,轻便地带在身上.
With the extensive application of digital circuits and microcomputers, the task of repairing and troubleshooting them is becoming more and more complicated, and it is quite natural to establish a rapid and effective detection method. The logic probe is based on this requirement It has the advantages of low cost, easy to use and easy to carry when compared with other complex instruments such as oscilloscopes, logic analyzers, etc. It can often be received when checking the circuit Some effects that are difficult to observe on an oscilloscope, such as short, low repetitive pulses (usually pulses less than 10 ns wide, logic probes stretch it to 50 ms and then push the LEDs), tristate logic in computers Logic resistance can be used to detect various devices such as DTL, TTL, MOS, CMOS, microprocessors, etc. The probe is used to contact the junction of the circuit under test, The corresponding LED will indicate the logic state of the point: high level, low level, open circuit or pulse.The logic probe itself does not have the power supply, the logic probe is connected to the circuit under test The power supply, so it can be like a pen as lightweight to carry around.