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Improved Method for Measuring Impedance

IP.com Disclosure Number: IPCOM000033496D
Original Publication Date: 2004-Dec-13
Included in the Prior Art Database: 2004-Dec-13

Publishing Venue

IBM

Abstract

In the past systems have been identified as having field (and laboratory) disk drive failure due to excessive noise from the power supply. Through functional testing, impedance measurements, and noise voltage measurements it was concluded that the addition of grounding clips on the disk drive rails reduced the impedance between the disk drive case (disk 'ground') and the chassis (chassis 'ground'). To prevent such failures in the future, a formal Chassis Impedance Measurement Procedure was developed and implemented. This procedure is a unique test process that is currently performed by the Environmental Stress Analysis Lab for each system.