The Model 8911 Electrodynamometer is equipped with a clear plastic faceplate fitted with a chrome piano hinge. It can be coupled to a 0.2-kW drive motor through the use of the Timing Belt (Model 8942). The faceplate can be lowered to provide access to the inside for coupling the Electrodynamometer to the drive motor. When closed, the faceplate is secured by two quick-lock fasteners.
The Electrodynamometer is made of a squirrel-cage rotor fitted in a DC-excited stator. Mechanical loading is achieved by increasing the stator field current, which generates eddy currents in the driven rotor. The stator is trunnion-mounted on ball bearings and rotates against a
helicoidal spring to oppose braking torque. The front end bell is provided with a circular scale that indicates the torque developed. The circular scale is graduated in either Imperial units (lbf@in, Model 8911) or Metric units (N@m, Model 8911-1) depending on model numbers. A damper lever is located underneath the dynamometer to prevent oscillation if the power supply is applied while the dynamometer is turning. To measure the torque, this lever can be pushed to adjust and read the torque. The Electrodynamometer is electrically powered from standard fixed AC line supply.