TM 10-1670-305-23&P
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TEST CHAMBER ASSEMBLY
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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.
