# Council Regulation (EEC) No 3821/85 of 20 December 1985 on recording equipment in road transport, Division 20: Calibration

Extent: E+W+S+N.I.

154 The calibration function shall allow:
to automatically pair the motion sensor with the VU,
to digitally adapt the constant of the recording equipment (k) to the characteristic coefficient of the vehicle (w) (vehicles with two or more axle ratios shall be fitted with a switch device whereby these various ratios will automatically be brought into line with the ratio for which the equipment has been adapted to the vehicle),
to adjust (without limitation) the current time,
to adjust the current odometer value,
to update motion sensor identification data stored in the data memory,
to update or confirm other parameters known to the recording equipment: vehicle identification, w, l, tyre size and speed limiting device setting if applicable.
155 Pairing the motion sensor to the VU shall consist, at least, in:
updating motion sensor installation data held by the motion sensor (as needed),
copying from the motion sensor to the VU data memory necessary motion sensor identification data.
156 The calibration function shall be able to input necessary data through the calibration/downloading connector in accordance with the calibration protocol defined in Appendix 8. The calibration function may also input necessary data through other connectors.

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Source: https://www.legislation.gov.uk/eur/1985/3821/annex/2/division/III/division/20 (the official version)
Page: https://openlegislation.uk/eu-regulation-1985-3821/annex-2/division-III/division-20
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.