1. A method of calibrating a test station, wherein the test station includes a test chamber having an antenna, a test unit, and a radio-frequency cable that connects the antenna to the test unit, the method comprising: performing measurements with a plurality of reference devices under test to obtain reference device under test path loss values associated with radio-frequency signals passing between the antenna and the reference devices under test within the test chamber; with the test station, testing a production device under test to determine whether the production device under test satisfies design criteria; in response to determining whether the production device under test satisfies the design criteria, performing measurements with the production device under test to obtain a production device under test path loss value associated with radio-frequency signals passing between the antenna and the production device under test; and calibrating the test station by computing a running average path loss value based on the reference device under test path loss values and the production device under test path loss value.