§ 67.10-20. Sound signal tests.
208 words·~1 min read·
/us/cfr/t33/s§ 67.10-20·A research copy — for the controlling text, always check the official state or federal source. Not legal advice.
(a)Sound signal tests must:
(1)Be made by the applicant in the presence of a Coast Guard representative, who certifies the test if the procedures comply with the requirements of this section;
(2)Be made with Coast Guard supplied and calibrated sound level meters and power meters; and
(3)Be made in an anechoic chamber large enough to accommodate the entire sound signal, as if installed for actual use.
(b)The sound pressure level must be measured as a function of:
(1)Distance by using a sufficient number of points to allow a far-field extrapolation of the sound pressure level;
(2)Power at outputs up to and including the approximate power level necessary to comply with § 67.10-1(c);
(3)Horizontal angle at increments not greater than 30°; and
(4)Harmonic content to at least the third harmonic.
(c)In analyzing the test data to determine the minimum power necessary to produce the sound pressure level specified in Table A of this section the Coast Guard follows the procedures prescribed by the International Association of Lighthouse Authorities
(IALA)in Supplement No. 3 to the IALA Bulletin of February 1969 for analysis of harmonic components and does not consider components above 1,100 Hertz as adding to the audible range.