Motor effi ciency remains one of the top issues for motor manufacturers. However, where effi ciency is concerned, there are trade-offs. As cost is always an important factor, motor manufacturers need to fi nd the right balance to increase motor output without driving up the cost. Induction motors are considered the largest users of electrical energy among all motors. They are used in a wide range of commercial and industrial applications, including fans, compressors, pumps, conveyors, winders, mills, transports, elevators, home appliances, and offi ce equipments. This application note focuses on the IEEE 112 Method B test and how data acquisition can fulfi ll effi ciency- test requirements. Introduction