Modern windturbines should be optimally adapted to the wind available at their locationand allow efficient operating conditions. In addition to the wind rotor itself,components of the drive train such as the transmission and the electricgenerator are crucial. The experimental unit contains a typical wind powerdrive train at laboratory scale, which is driven by an electric motor. Themotor enables low speeds with high torque. This simulates a typical slowlyrotating wind rotor. The speed can be adjusted. The drive train consists of theslow-rotating drive side, the fast-rotating generator side and a three-stagespur gear between the drive and the generator. The electrical load of thegenerator can be varied. The experiments with simulate typical operatingconditions of a drive train. To do this, the electrical load of the generatorand the speed of the drive motor are varied. This makes it possible toapproximate operating points of a typical torque characteristic. The calculatedcharacteristic results from the mechanical power of a wind rotor for a givenwind speed. The generator speed and the torques of the drive side and generatorare captured by sensors and displayed digitally on the measuring amplifier.