Each Unit Under Test (UUT) begins the test sequence at 0% load. For desktop power supplies, the next test point is at 2% load. However, if the desktop PSU is rated below 500 watts, this step is replaced with a fixed 10-watt load. The sequence then continues at 5%, 10%, 20%, 50%, and 100% load.

For server power supplies, the full test sequence includes 0%, 5%, 10%, 20%, 50%, and 100% load levels. At each load point, the unit is operated for a duration of 15 minutes prior to data collection as shown in Error! Reference source not found..

Table 1: Loading Sequence