Attachment 4-CPTS Evaluation Information

Design a Replacement ARSR4 Collector Power Supply Test
Station (CPSTS) with functions similar to the current station with Interface Adapter Fixture, Test/Repair software and procedures to test the ARSR4 Collector/Preamp Module LRUs to specification

1.2.1 Functional Description. –

The CPSTS test set is a computer-operated diagnostic test tool designed to perform functional testing, fault diagnosis, and repair verification of the Collector Power Supply and Preamp Power Supply units used in the ARSR4 Radar. The CPSTS is also used to verify failures and troubleshoot units returned from the sites to the Depot as failed units. 1.2.3 Electrical DescriptionThe power distribution unit, located in the rear of the main console, serves as the main interface between the test set and 120/208 VAC, 60hz, 3 phase and the 120 VAC, 60hz, 1 phase utility power. The power distribution unit distributes this power to the internal instruments in the test set and protects the test set circuitry via integral circuit breakers. A utility outlet is located on the power distribution unit on the rear of the console. This outlet is protected by an integral GFI circuit breaker. If this circuit breaker is tripped, the power to the entire test console will be disabled. If power cannot be applied to the test console, check to verify that this circuit breaker is properly reset before troubleshooting the console power problem. Test set power is activated and deactivated via a palm switch located on the patch panel interface module. A GPIB bus connector is provided to route the GPIB bus controller in from the personal computer to all GPIB controlled equipment in the test console. Signals from the individual test station hardware to the unit under test (UUT) are routed through a Virginia panel interface module providing a single connection point for all test equipment signals. The UUT Interface Panel contains the main DC bus and AC input interface for the Collector/Preamp Power Supply UUTs. The Interface Panel also provides cool air and safety interlocks for the UUT. Cooling air is activated via the circuit breaker on the panel. Safety interlocks are incorporated so that the safety shields must be in place before the AC power source is activated.
The UUT Interface Panel also contains coaxial connections to allow the oscilloscope probes to be attached to the UUT with its covers removed and routed to the oscilloscope via jumper cables.
A capacitor load is installed behind the load assemblies to simulate the load