公开(公告)号：US4345201A

公开(公告)日：1982-08-17

申请号：US161484

申请日：1980-06-20

申请人： Brett A. Thompson ,  John A. Webb ,  Martin B. White

发明人： Brett A. Thompson ,  John A. Webb ,  Martin B. White

IPC分类号： G01R31/08 ,  G01R31/28 ,  G01R31/315

CPC分类号： G01R31/088 ,  G01R31/28 ,  G01R31/2806 ,  G01R31/315

摘要： A probe for sensing the direction of flow of an injected current pulse along a conductor of a circuit under test. The probe is linked to automatic test equipment (ATE), and is triggered to inject the pulse during a test sequence at a step previously found by the ATE to establish a faulty state in the circuit so that the faulty one of several components connected to a circuit node can be identified. The probe injects an approximately triangular-waveform current pulse which has a steep rising edge and a less steep falling edge, thereby inducing a voltage level and thus permits discrimination of the direction of current flow. To detect low level current pulses in the presence of masking noise, the output of the probe is connected to the series combination of a filter, an integrator and an A/D converter. The circuit under test is set to its faulty state, and then the probe is repeatedly operated, first with the injection of the current pulses inhibited and then with current pulses being injected. An average noise level is calculated, and then compared with the average signal level obtained while pulses are being injected to determine the direction of flow of the injected current pulses.

摘要翻译： 用于感测沿着被测电路的导体的注入电流脉冲的流动方向的探头。 探头连接到自动测试设备（ATE），并且被触发以在ATE先前发现的步骤期间在测试序列期间注入脉冲，以在电路中建立故障状态，使得几个组件中的有缺陷的一个连接到 电路节点可以被识别。 探头注入近似三角波形的电流脉冲，其具有陡峭的上升沿和较不陡峭的下降沿，从而引起电压电平，从而允许区分电流方向。 为了在存在掩蔽噪声的情况下检测低电平电流脉冲，探头的输出连接到滤波器，积分器和A / D转换器的串联组合。 被测电路设置为故障状态，然后重复操作探头，首先注入电流脉冲，然后注入电流脉冲。 计算平均噪声电平，然后与注入脉冲时获得的平均信号电平进行比较，以确定注入电流脉冲的流向。