Korry is a manufacturer of control panels for the Boeing 787 aircraft.
Traditional control panels consist of switches and indicators, each with its own set of wires that interface to one or more connectors. The 787 control panels reduce wiring by incorporating a controller area network (CAN) bus for switch control and indicator status.
The problem
To develop an automated test system that functionally tests flight deck control panels for switch closures, indicator light illumination, and potentiometer settings. To design an interface board that provides a single connector for use with numerous cable harnesses, and develop an easy-to-use user interface for test operators.
The customer
Korry's requirements for a test station included the need to develop a test platform with all instrumentation, switching, and control contained within a compact footprint.
Starting with PXI as the core platform, Korry identified Geotest's GX7400 PXI power supply as meeting its needs for supplying power to the unit under test (UUT). Using the GX7400 dual-channel power supply to supply 28 V d.c, the control panel's switches, potentiometers, and indicators were tested for functionality. Additional test components included relay cards to route power from the DC power supply to the panel, a digital multimeter (DMM) card, and CAN-bus interface cards.
The solution
To support the testing of several different types of control panels, test engineer Allen Cutler designed an interface board that provides a common interface between all test system resources and a 156-pin Ziff connector. With a common tester interface, only a unique cable assembly is required to support each specific type of UUT, resulting in a simple and compact test solution with support for a variety of different control panels. A test program that prompts the user to actuate switches or observe status indicators controls all test functions.
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