Which MODE switch selection helps ensure that the AN/UPM-145 Radar Test Set is operating properly prior to any other operation?

Choosing the SELF TEST mode is crucial for verifying the operational status of the AN/UPM-145 Radar Test Set before proceeding with any further operations. This mode conducts a series of built-in diagnostic checks that evaluate the functionality of various internal systems and components. By running the SELF TEST, users can confirm that the unit is correctly calibrated and functioning as intended, which significantly enhances the reliability of any subsequent radar testing activities.

Other modes, while also useful, do not specifically provide the comprehensive self-diagnostic examination that the SELF TEST mode does. For example, ZERO TEST typically focuses on calibrating the system to a baseline reference, while TEST CONFIG and ZERO CONFIG are concerned with setting up configurations rather than confirming operational integrity. Thus, utilizing the SELF TEST mode is an essential first step in the operational process for ensuring the test set is ready and capable of delivering accurate measurements.