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Method for Detecting Intermittent Opens and Shorts in a Commonly Connected Resistive Network

IP.com Disclosure Number: IPCOM000034355D
Original Publication Date: 1989-Feb-01
Included in the Prior Art Database: 2005-Jan-27
Document File: 2 page(s) / 47K

Publishing Venue

IBM

Related People

Kahwaty, VN: AUTHOR [+2]

Abstract

Differential networks used for thin film magneto-resistive or inductive read heads, including the associated cables and connectors, can be simply viewed as a resistive network with closely matched elements tied to a common ground. This matched element network is commonly encountered due to the desirability of obtaining very high common mode noise rejection. Although solid shorts and opens are easily detected with typical measurement methods, intermittent shorts or opens cannot be effectively detected due to the common ground bus connecting the resistive elements and the limited observation time of these methods.

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Method for Detecting Intermittent Opens and Shorts in a Commonly Connected Resistive Network

Differential networks used for thin film magneto-resistive or inductive read heads, including the associated cables and connectors, can be simply viewed as a resistive network with closely matched elements tied to a common ground. This matched element network is commonly encountered due to the desirability of obtaining very high common mode noise rejection. Although solid shorts and opens are easily detected with typical measurement methods, intermittent shorts or opens cannot be effectively detected due to the common ground bus connecting the resistive elements and the limited observation time of these methods. To solve this problem, a new method of test interconnection and sensing is described which leads to simultaneous shorts/open detection in the composite network while the system is stressed by vibration or similar means. The figure shows an interconnection of differential elements designated as R1A/R1B and R2A/R2B, etc. The elements are connected into three groups with the common ground line threading through this connection system. A unique arrangement of N pairs of differential elements are connected such that physically adjacent elements are connected in different groups. Within a group matched elements are arranged on opposite sides of the ground bus and connected in common to RL1 and RL1', respectively, which are closely matched external resistors. One side of...