LOCATION AND DESCRIPTION OF MAJOR COMPONENTS (MODEL 453)

TM 10-1670-305-23&P 0003 00-3 TEST CHAMBER ASSEMBLY 0003 00 EQUIPMENT DESCRIPTION AND DATA LOCATION AND DESCRIPTION OF MAJOR COMPONENTS (MODEL 453) The test chamber basically consists of a vacuum pump/air compressor assembly, altitude chamber and control assembly. All components are attached to a mounting base and are contained in a carrying case which also serves as a storage container. The altitude chamber has a detector which senses the movement of the piston to the AR2. It is connected to the control assembly so that a Light Emitting Diode (LED) signals the instant the piston moves. It also has a provision for monitoring the position of the AR2 JUMP/OFF switch. The control assembly is a self-contained, independently calibrated, completely interchangeable, removable unit. This unit contains a precision calibrated pressure sensor, a printed circuit board containing the required signal conditioning and operating logic, digital displays incorporating a preprogrammed microprocessor for pressure-to-altitude conversions, pneumatic valves and regulators to control altitude chamber conditions, regulated power supplies to run associated electronic circuits and devices, and operational controls and indicator lights to perform and monitor the various test functions. Finally, a quick-disconnect port is incorporated into the control assembly to provide access to a master altimeter for verifying calibration of the electronic pressure sensor.