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Universal Thermal Card for Personal Computer Product Test

IP.com Disclosure Number: IPCOM000106923D
Original Publication Date: 1992-Jan-01
Included in the Prior Art Database: 2005-Mar-21
Document File: 2 page(s) / 79K

Publishing Venue

IBM

Related People

Huckabee, BF: AUTHOR [+3]

Abstract

This article describes a universal thermal card design which provides four levels of power dissipations when plugged into a personal computer (PC) system bus. The number of resistors powered up during thermal testing can be varied by means of jumpers on the card, thus varying the thermal load.

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This is the abbreviated version, containing approximately 52% of the total text.

Universal Thermal Card for Personal Computer Product Test

       This article describes a universal thermal card design
which provides four levels of power dissipations when plugged into a
personal computer (PC) system bus.  The number of resistors powered
up during thermal testing can be varied by means of jumpers on the
card, thus varying the thermal load.

      During system thermal qualification testing the I/O slots are
populated with thermal cards to simulate system heat load, air flow
impedance and to determine the maximum power that can be dissipated
in I/O cards in a given system. The thermal cards are populated with
heat dissipators (R-packs, cylindrical resistors) and total card
electrical resistance is fixed.  Therefore, when they are plugged
into a 5 V bus, it provides only one level of power dissipation. For
another power level, a different card has to be built. Accordingly,
for each power level a unique card is required. These thermal cards
do not have copper planes to spread heat as in a final product.  Each
card uses different numbers of resistors and a different component
arrangement to achieve the desired power dissipation.  This makes
correlation of thermal data difficult.

      The proposed universal thermal card design of this disclosure
provides four levels of power dissipation when plugged into a bus, by
simply connecting different combinations of jumper pins on the top of
card as shown in front view in Fig. 1.  The card can also be powered
externally from rear jacks.  The number of components and component
layout is fixed so that therma...