Test instruments. The instruments used to record loads applied and movements shall have the following degree of accuracy: (a) Loads applied ± 50 ▇▇▇, (b) Movements ± 0.01 mm. 3.3.3.2.1.4. Test procedure 3.3.3.2.1.4.1. The coupling device shall first be subjected to a pre-traction load which does not exceed 15 % of the traction test load defined in paragraph 3.3. 3.2.1.4.2. The operation described in paragraph 3.3. 3.2.1.4.1 shall be repeated at least twice, starting with a zero load, which is gradually increased until the value prescribed in paragraph 3.3.3.2.1.4.1 is reached, and then decreased to 500 ▇▇▇; the settling load shall be maintained for at least 60 seconds.
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Sources: Agreement Concerning the Adoption of Harmonized Technical United Nations Regulations for Wheeled Vehicles, Agreement Concerning the Adoption of Harmonized Technical United Nations Regulations for Wheeled Vehicles