Electrical resistor testing chamber

Abstract

A testing chamber is generally comprised of a support structure, drawers for holding the modular test trays, timer, power supplies, and air blower. The support structure supports a plurality of drawers in horizontal position with the drawers supporting a plurality of test trays in a horizontal, parallel alignment. When a particular test allows air flow, air is blown into the plenum of the support structure, and passes through outlets of the support structure and into mating air inlets of the plena of the drawers. Flapper valves provide control of the air flow at the support structure outlets. The air then passes through a diffusing medium covering the slots of the drawers and up through air passages in the test tray such that there is no direct impingement of air on the components mounted on the modules. The diffusing medium maintains the air flow through the slots of the drawers at a uniform velocity whether test trays are present or not. A principal object of this invention is to provide the testing chamber which will accommodate a modular test tray for electrical resistors or the like which allows for a pressure chamber so that air can flow up between the units taking away heat and yet not allowing direct impingement of air on the components to be tested. A still further object of the invention is to provide a testing chamber capable of providing uniform velocity air flow to the components to be tested.