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Browse Prior Art Database

Environmental Test Chamber for Circuit Card

IP.com Disclosure Number: IPCOM000089298D
Original Publication Date: 1977-Oct-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Hanson, JS: AUTHOR

Abstract

The drawing shows a section view of an environmental test chamber for circuit cards 3, represented in edge view by dashed lines. The test chamber is enclosed in a heavy layer of thermal insulation 4. Air circulates past the cards in a path that is established by two movable baffles 7 and 8 and two stationary walls 9 and 10. When baffles 7 and 8 are in the position shown in the drawing, a centrifugal fan 11 circulates air in a counterclockwise path that includes heaters 13 and 14. A sensor 16 senses the rate of air flow, and signals from the sensor are used to control the position of a damper 17 to regulate the rate of air flow. Air temperature is sensed by sensor 16 and by thermocouples (not shown) that are located on the circuit card being tested.

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Environmental Test Chamber for Circuit Card

The drawing shows a section view of an environmental test chamber for circuit cards 3, represented in edge view by dashed lines. The test chamber is enclosed in a heavy layer of thermal insulation 4. Air circulates past the cards in a path that is established by two movable baffles 7 and 8 and two stationary walls 9 and 10. When baffles 7 and 8 are in the position shown in the drawing, a centrifugal fan 11 circulates air in a counterclockwise path that includes heaters 13 and 14. A sensor 16 senses the rate of air flow, and signals from the sensor are used to control the position of a damper 17 to regulate the rate of air flow. Air temperature is sensed by sensor 16 and by thermocouples (not shown) that are located on the circuit card being tested. When a selected temperature has been reached, baffles 7 and 8 are moved to the positions shown at 7' and 8', and air circulates by convection in a path that includes heater 14 and the space 18 between stationary walls 9 and 10.

The test chamber is large enough to hold the circuit cards under test and to hold other circuit cards that are required for the test or for the normal operation of the cards being tested. The test chamber can also hold dummy cards that have only resistors, and simulate the heating effect of nearby cards in an actual machine.

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