TI's Bob Hanrahan describes how to measure efficiency when testing a DC/DC power supply, and ensure that it works reliably over various operating conditions. The second video in a four-part series is intended to provide the designer with a sufficient understanding about the testing needed to verify a reliable power supply design. The Engineer It videos from Texas Instruments are instructional, how-to videos on a variety of technical topics. For more videos on testing power supplies, check out:  

• Measuring efficiency: www.ti.com/testingpoweroverview
• Measuring noise: www.ti.com/measuringnoise  
• Measuring stability: www.ti.com/measuringstability