Document ID: chunk:federal_register_of_legislation:F2018L01513:body:0:p11
Version: federal_register_of_legislation:F2018L01513
Segment Type: other
Provision Reference: 
Character Range: 31930–34918

of the generator indicated by the manufacturer for continuous operation.

6.3.9. The time lapse between the moment when the audible warning device, audible warning system, multiple audible warning system is actuated and the moment when the sound reaches the minimum value prescribed in paragraph 6.3.7.1. above shall not exceed 0.2 second measured at an ambient temperature of 20 + 5 ºC. This provision is applicable inter alia, to pneumatic or electro-pneumatic audible warning device, audible warning system, multiple audible warning system.

6.3.10. Pneumatic or electro-pneumatic audible warning device, audible warning system, multiple audible warning system shall, when operating under the power supply conditions established by the manufacturers, satisfy the same acoustic requirements as are prescribed for electrically operated audible warning device, audible warning system, multiple audible warning system.

6.3.11. To confirm the rated sound frequency (or frequencies) of audible warning device, audible warning system, multiple audible warning system the tests to measure this parameter using a spectrum analyzer with a frequency resolution of at least 1 Hz shall be conducted. The measured frequency (or frequencies) of the audible warning device, audible warning system, multiple audible warning system may differ from the rated sound frequency (or frequencies) no more than 10 per cent.

6.4. Endurance test

6.4.1. The audible warning device, audible warning system, multiple audible warning system shall be supplied with current at the rated voltage and with the connecting lead resistances specified in paragraphs 6.3.4. to 6.3.6. above, and operated respectively:

10,000 times for audible warning device, audible warning system, multiple audible warning system intended principally for vehicles of categories L3 to L5 with a power less than or equal to 7 kW.

50,000 times for audible warning device, audible warning system, multiple audible warning system intended principally for vehicles of categories M, N and L3 to L5 with a power greater than 7 kW, each time for one second followed by an interval of 4 s.

During the test, the audible warning device, audible warning system, multiple audible warning system shall be ventilated by an air current having a speed of approximately 10 m/s and the electro-pneumatic audible warning device, audible warning system, multiple audible warning system  may be lubricated with the oil recommended by the manufacturer after every 10,000 times of operation.

6.4.2. If the test is made in an anechoic chamber, the chamber shall be large enough to ensure normal dispersal of the heat released by the audible warning device, audible warning system, multiple audible warning system during the test.

6.4.3. The ambient temperature in the testing room shall be between +15 and +30 ºC inclusively.

6.4.4. If, after the audible warning device, audible warning system, multiple audible warning system has been operated for half the