公开(公告)号：US4377782A

公开(公告)日：1983-03-22

申请号：US161485

申请日：1980-06-20

申请人： Eric Metcalf ,  Jack Woollven ,  Stephen N. Spens ,  Brian L. A. Kett

发明人： Eric Metcalf ,  Jack Woollven ,  Stephen N. Spens ,  Brian L. A. Kett

IPC分类号： G01R31/08 ,  G01R31/28 ,  G01R31/302 ,  G01R31/315 ,  G06F11/22

CPC分类号： G01R31/088 ,  G01R31/28 ,  G01R31/2806 ,  G01R31/315 ,  G06F11/2273

摘要： A probe for sensing direction of flow of an injected current pulse along a conductor of a circuit under test is linked to an ATE, to be 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. Thus, the faulty one of several components connected to a circuit node can be identified. The probe itself can also be used independently, and injects an approximately triangular-waveform current pulse which has a steep rising edge and a less steep falling edge, thereby inducing a voltage pulse which is asymmetric about the zero voltage level and thus permits discrimination of the direction of current flow. The probe may have a single current injection contact disposed between the limbs of a bifurcated core for the pick-up coil.

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针被连接到ATE，以被触发以在ATE先前发现的步骤的测试序列期间注入脉冲以建立故障状态 在电路中。 因此，可以识别连接到电路节点的多个组件中的故障之一。 探头本身也可以独立使用，并且注入大约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，从而产生在零电压电平上不对称的电压脉冲，从而允许区分 电流方向。 探针可以具有设置在用于拾取线圈的分叉芯的四肢之间的单电流注入接触。

公开(公告)号：US4445085A

公开(公告)日：1984-04-24

申请号：US449705

申请日：1982-12-14

申请人： Eric Metcalf ,  Jack Woollven ,  Stephen N. Spens ,  Brian L. A. Kett

发明人： Eric Metcalf ,  Jack Woollven ,  Stephen N. Spens ,  Brian L. A. Kett

IPC分类号： G01R31/08 ,  G01R31/28 ,  G01R31/302 ,  G01R31/315 ,  G06F11/22

CPC分类号： G01R31/088 ,  G01R31/28 ,  G01R31/2806 ,  G01R31/315 ,  G06F11/2273

摘要： A probe for sensing direction of flow of an injected current pulse along a conductor of a circuit under test is linked to an ATE, to be 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. Thus, the faulty one of several components connected to a circuit node can be identified. The probe itself can also be used independently, and injects an approximately triangular-waveform current pulse which has a steep rising edge and a less steep falling edge, thereby inducing a voltage pulse which is asymmetric about the zero voltage level and thus permits discrimination of the direction of current flow. The probe may have a single current injection contact disposed between the limbs of a bifurcated core for the pick-up coil.

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针被连接到ATE，以被触发以在ATE先前发现的步骤的测试序列期间注入脉冲以建立故障状态 在电路中。 因此，可以识别连接到电路节点的多个组件中的故障之一。 探头本身也可以独立使用，并且注入大约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，从而产生在零电压电平上不对称的电压脉冲，从而允许区分 电流方向。 探针可以具有设置在用于拾取线圈的分叉芯的四肢之间的单电流注入接触。

公开(公告)号：US4428061A

公开(公告)日：1984-01-24

申请号：US234533

申请日：1981-02-17

申请人： Michael J. Skinner ,  Jack Woollven ,  Eric Metcalf ,  Howard A. Dorey

发明人： Michael J. Skinner ,  Jack Woollven ,  Eric Metcalf ,  Howard A. Dorey

IPC分类号： H02J13/00 ,  H03M5/12 ,  H04B3/54 ,  H04L1/00 ,  H04L25/49 ,  H04L27/00 ,  G06F15/34 ,  H04L27/18 ,  H04L27/22

CPC分类号： H02J13/0037 ,  H04B3/542 ,  H04B2203/5416 ,  H04B2203/5433 ,  H04B2203/5441 ,  H04B2203/5487 ,  H04B2203/5491 ,  Y02E60/7892 ,  Y04S40/146

摘要： A receiver, for receiving a signal comprising a carrier signal modulated with a digital signal, comprises a circuit for demodulating the received signal to produce an output signal which contains the digital signal. Because of repeated filtering, the digital signal is typically in the form of an approximately sinusoidal signal, which has a component whose frequency is equal to half the basic bit rate of the digital signal: because of noise, this component is subject to considerable timing jitter. To overcome this, the output signal is digitized and applied to a digital correlator, where it is correlated with a reference signal whose frequency is also equal to half the basic bit rate of the digital signal. The reference signal is preferably derived from a phase-locked loop locked to the carrier frequency. The correlator, which is constituted by a microprocessor, determines the instants of time which most nearly coincide with the mean-level crossing points of said component (which instants correspond to transitions between one bit of the digital signal and the next), and also determines successive bit values on the basis of the coincidence determination. The receiver can be used to receive mains-borne signals, i.e. signals transmitted over an electrical power supply network, or radio broadcast signals.