A dynamometer consists of an absorption (or absorber/driver) unit, and usually includes a means for measuring torque and rotational speed.We are using a torque meter which measures the torque and rpm of the motor.The torque arm is connected to the dyno housing and a weighing scale is positioned so that it measures the force exerted by the dyno housing in attempting to rotate.Some means is provided to develop a braking torque between the rotor and housing of the dynamometer.The means for developing torque can be frictional, hydraulic, electromagnetic, or otherwise, according to the type of absorption/driver unit.