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The Environmental Protection Agency has recently purchased electric dynamometers for use in emission and fuel economy testing of light duty vehicles. These dynamometers are equipped with a single large diameter roll (1.219 meter, 48 inch) and electric inertia/road load simulation capability. The dynamometers are required to pass a series of robust performance requirements. The evaluation of the system performance was based on data acquisition and analysis completely independent of the dynamometer's operational and analysis software. An independent test system was used for verification of the dynamometer's operational features, control, and error reporting software. Testing was performed following the dynamometer installation at the EPA National Vehicle Fuel and Emission Laboratory (NVFEL). EPA performed evaluation tests, analyzed the data, and graphically displayed the results using commercially available microcomputer hardware and programs.