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虽然在数字电路中探测故障的目的是把失效的元件隔离起来,但到目前为止还没有发明一个简单方法来完成这一任务。充其量,逻辑探头、示波器以及其他的数字探测装置能够用来测定节点不多的电路,不能测定驱动器或接收器。Hewlett——Packard公司做的547A型电流示踪器能够精确地确定已经失效的元件,因为它能够揭露失效电流流动的通路。例如,假如一个信号总线固定在地上,547A可以测定接收器或驱动器甚
Although the purpose of probing faults in digital circuits is to isolate the failed components, so far no simple method has been invented to accomplish this task. At best, logic probes, oscilloscopes, and other digital probing devices can be used to measure a small number of nodes and can not determine the driver or receiver. The Model 547A current tracer from Hewlett-Packard Company accurately identifies a failed component as it reveals the path through which the failed current flows. For example, if a signal bus is fixed to the ground, the 547A can measure the receiver or driver