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Capacitively Coupled Ground Probe for TDR

IP.com Disclosure Number: IPCOM000041720D
Original Publication Date: 1984-Mar-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Derr, PB: AUTHOR [+2]

Abstract

An easily manipulated probe for determining circuit line integrity time domain reflectometry (TDR) uses the center conductor of a rigid coaxial cable as the signal contact and pear-shaped plate connected to the outer conductor as the ground probe contact. The ground probe can then be capacitively coupled to a larger ground reference panel. Referring to the figure, rigid coaxial cable 1 has an inner conductor 2 serving as signal contact for placement on a circuit line 3 to be tested on panel 4. Outer conductor 5 is connected by short lead 6 to a pear-shaped ground probe of copper foil 7 on an insulative substrate 8. Panel 4 may have conductors on the opposite side and is supported on a ground reference plane of substrate 9 and the copper foil 10.

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Capacitively Coupled Ground Probe for TDR

An easily manipulated probe for determining circuit line integrity time domain reflectometry (TDR) uses the center conductor of a rigid coaxial cable as the signal contact and pear-shaped plate connected to the outer conductor as the ground probe contact. The ground probe can then be capacitively coupled to a larger ground reference panel. Referring to the figure, rigid coaxial cable 1 has an inner conductor 2 serving as signal contact for placement on a circuit line 3 to be tested on panel 4. Outer conductor 5 is connected by short lead 6 to a pear- shaped ground probe of copper foil 7 on an insulative substrate 8. Panel 4 may have conductors on the opposite side and is supported on a ground reference plane of substrate 9 and the copper foil 10. In use, with panel 4 supported on the ground reference plane, signal contact 2 is placed on one end of a circuit line 3 and ground probe 7, 8 is laid on panel 4. Upon energization with a high frequency pulse, the ground probe provides a low impedance capacitive coupling to ground reference plane 9, 10 beneath panel 4. This arrangement enables a fast pulse rise time that improves the accuracy with with the location of a circuit fault can be determined.

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