Fault location methods and apparatus using current pulse injecti

Details Fault location methods and apparatus using current pulse injecti Fault location methods and apparatus using current pulse injecti

1980-06-20

1983-03-22

Strecker, Gerard R.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324 73PC, G01R 3108, G01R 3128

Patent

active

043777821

ABSTRACT:
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.

REFERENCES:
patent: 3753089 (1973-08-01), Gunn et al.
patent: 3986116 (1976-10-01), Smith et al.
patent: 4074188 (1978-02-01), Boatman et al.
patent: 4115731 (1978-09-01), Axtell
patent: 4186338 (1980-01-01), Fichtenbaum
Beckwith et al., "Tracing Current by Inductive Pickup Tracks Logic Faults Precisely" Electronics, vol. 49, No. 25, pp. 106-110, Nov. 25, 1976.
Weston Instruments Model 670 "In-Circuit Tester" Operation Manual.
Beckwith, J. F. "Current Tracer: A New Way to Find Low Impedance Logic-Circuit Faults", Hewlett Packard Brochure pp. 2-8.
Hoffman et al. "A Technique for Precise Fault Diagnosis on Devie-Laden Buses of LSI Boards," Teradyne Inc. Sep. 1978, pp. 371-376.
Bernd Pohlmann and Dieter Giesbrecht, "Schnelle Fehlerdiagnose an bestuckten Leiterplatten", Electronik, vol. 28, No. 5., (1979.03), pp. 53-56.

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