QC series AC Dynamometer includes QC100 series Horizontal High-speed AC Electric Dynamometer with two stage AC motor, QC200 series Horizontal Low-speed & Big-torque AC Electric Dynamometer, and QC300 series Vertical AC Electric Dynamometer. They test the following items: Speed Characteristic, Load Characteristic, Durability Characteristic, Mechanical Efficiency, Speed Tuning Characteristic Testing for general utility small engine (includes Speed-Tuning Testing, Abrupt-Increasing-load Testing, Abrupt-Decreasing-Load Testing, and Fluctuant Rotating Speed Testing), and Curve Method Testing on duty (optional).