What is the first type of test performed on a controller cabinet assembly?

The first type of test performed on a controller cabinet assembly is the bench test. This test is conducted prior to installation and involves checking the assembly in a controlled environment to ensure all components are functioning correctly. During the bench test, technicians can verify the electrical connections, signal outputs, and overall operation of the controller without the factors that may arise in the field, such as environmental conditions and installation issues.

Conducting a bench test first allows for troubleshooting and adjustments to be made in a more manageable setting, ultimately saving time and resources once the assembly is installed in the actual traffic signal system. It establishes a baseline for performance and reliability, ensuring that the assembly is ready for more complex testing procedures that occur later in the process, such as operational and field tests.