Question: What is the primary purpose of conducting a single point power reference measurement at the beginning and end of the UE's OTA antenna performance testing procedure?
Option 1: To monitor and compensate for Tx-power drift of the Device Under Test (DUT), ensuring accuracy in sensitivity and power measurements.
Option 2: To validate the DUT's compliance with the maximum allowed transmit power specifications.
Option 3: To initialize and calibrate the testing equipment for each measurement frequency band.
Option 4: To assess the DUT's battery life during continuous transmission scenarios.
Explanation: Monitoring Tx-power drift is crucial as it affects the accuracy of sensitivity and power measurements. By measuring at the start and end, testers can quantify this drift, include it in the uncertainty budget, and potentially mitigate its impact through interleaved measurements, thus ensuring more reliable test outcomes.