Source: http://fmcsa.dot.gov/rules-regulations/administration/fmcsr/fmcsrruletext.aspx?reg=325.73
Timestamp: 2013-05-18 23:24:36
Document Index: 625213255

Matched Legal Cases: ['§ 325', '§325', '§325', '§ 325', '§325', '§325']

Microphone distance correction factors. - Federal Motor Carrier Safety Administration
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Microphone distance correction factors.
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325.75 >
Disclaimer Help Subpart F - Correction Factors Code of Federal Regulations§ 325.73 Microphone distance correction factors. 11 Table 1, in §325.7 is a tabulation of the maximum allowable sound level readings taking into account both the distance correction factors contained in §325.73 and the ground surface correction factors contained in § 325.75. If the distance between the microphone location point and the microphone target point is other than 50 feet (15.2 m), the maximum observed sound level reading generated by the motor vehicle in accordance with §325.39 of this part or the numerical average of the recorded maximum observed sound level readings generated by the motor vehicle in accordance with §325.59 of this part shall be corrected as specified in the following table:Table 2—Distance Correction FactorsIf the distance between the microphone location point and the microphone target point isThe value dB(A) to be applied to the observed sound level reading is—31 feet (9.5 m) or more but less than 35 feet (10.7 m)−435 feet (10.7 m) or more but less than 39 feet (11.9 m)−339 feet (11.9 m) or more but less than 43 feet (13.1 m)−243 feet (13.1 m) or more but less than 48 feet (14.6 m)−148 feet (14.6 m) or more but less than 58 feet (17.7 m)058 feet (17.7 m) or more but less than 70 feet (21.3 m)+170 feet (21.3 m) or more but less than 83 feet (25.3 m)+2[40 FR 42437, Sept. 12, 1975, as amended at 54 FR 50385, Dec. 6, 1989]