Document ID: chunk:federal_register_of_legislation:F2021C00509:front:0:p41
Version: federal_register_of_legislation:F2021C00509
Segment Type: other
Provision Reference: 
Character Range: 120621–123588

Regulation)

The above approval mark affixed to a motor cycle shows that the motor cycle type concerned has, with regard to noise, been approved in the Netherlands (E 4) pursuant to Regulation No. 41 under approval number 032439. The approval number indicates that the approval was granted according to the requirements of Regulation No. 41 as amended by the 03 series of amendments.

Model B
(See paragraph 5.5. of this Regulation)

The above approval mark affixed to a motor cycle shows that the motor cycle type concerned has been approved in the Netherlands (E 4) pursuant to Regulations Nos. 41 and 33./ The approval numbers indicate that, at the dates when the respective approvals were given, Regulation No. 41 was amended by the 03 series of amendments, but Regulation No. 33 included the 01 series of amendments.
Annex 3

METHODS AND INSTRUMENTS FOR MEASURING NOISE MADE BY MOTOR CYCLES

          1. Noise of the motorcycle in motion (measuring conditions and method for testing of the vehicle during component type approval).

1.1. Limits: see annex 6

          1.2. Measuring instruments

          1.2.1. Acoustic measurements

          The apparatus used for measuring the sound level shall be a precision sound level meter of the type described in International Electrotechnical Commission (IEC) publication 179 "Precision sound-level meters", second edition.
          Measurements shall be carried out using the 'fast' response of the sound-level meter and the 'A' weighting also described in that publication.
          At the beginning and end of each series of measurements the sound level meter shall be calibrated in accordance with the manufacturer's instructions, using an appropriate sound source (e.g. pistonphone).

1.2.2. Speed measurements

          Engine speed and motorcycle speed on the test track shall be determined to within +/- 3
          per cent.

1.3. Conditions of measurement

1.3.1. Condition of the motorcycle

          During the measurements the motorcycle shall be in running order (including coolant, oils, fuel, tools, spare wheel and rider).

          Before the measurements are made the motorcycle shall be brought to the normal operating temperature. If the motorcycle is fitted with fans with an automatic actuating mechanism, this system shall not be interfered with during the sound measurements. For motorcycles having more than one driven wheel, only the drive provided for normal road operation may be used. Where a motorcycle is fitted with a sidecar, this must be removed for the purposes of the test.

1.3.2. Test site

          The test site shall consist of a central acceleration section surrounded by a substantially level test area. The acceleration section shall be level; its surface shall be dry and so designed that rolling noise remains low.
          On the test site the variations in the free sound field between the sound source at the centre of the acceleration section and the