Test Preparation. 6.2.1. Load and inertia setting 6.2.1.1. Load determined with vehicle road test The dynamometer shall be adjusted so that the total inertia of the rotating masses will simulate the inertia and other road load forces acting on the vehicle when driving on the road. The means by which this load is determined is described in paragraph 5. of this annex. Dynamometer with fixed load curve: the load simulator shall be adjusted to absorb the power exerted on the driving wheels at a steady speed of 80 km/h and the absorbed power at 50 km/h shall be noted. Dynamometer with adjustable load curve: the load simulator shall be adjusted in order to absorb the power exerted on the driving wheels at steady speeds of 120, 100, 80, 60 and 40 and 20 km/h. 6.2.1.2. Load determined by vehicle reference mass With the manufacturer's agreement the following method may be used. The brake is adjusted so as to absorb the load exerted at the driving wheels at a constant speed of 80 km/h, in accordance with Table 3. If the corresponding equivalent inertia is not available on the dynamometer, the larger value closest to the vehicle reference mass will be used. In the case of vehicles other than passenger cars, with a reference mass of more than 1,700 kg or vehicles with permanent all-wheel drive, the power values given in Table 3 are multiplied by a factor 1.3. 6.2.1.3. The method used and the values obtained (equivalent inertia - characteristic adjustment parameter) shall be recorded in the test report. 6.2.2. Preliminary testing cycles Preliminary testing cycles should be carried out if necessary to determine how best to actuate the accelerator and brake controls so as to achieve a cycle approximating to the theoretical cycle within the prescribed limits under which the cycle is carried out.
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Sources: Agreement Concerning the Adoption of Uniform Technical Prescriptions for Wheeled Vehicles, Agreement Concerning the Adoption of Uniform Technical Prescriptions for Wheeled Vehicles