§325.73. Microphone distance correction factors. 1
49 C.F.R. § 325.73
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:
Notes, amendments, and revision history
Amendments
[40 FR 42437, Sept. 12, 1975, as amended at 54 FR 50385, Dec. 6, 1989]
Authority
Authority: 42 U.S.C. 4917; 49 U.S.C. 301; and 49 CFR 1.87.
Source
Source: 40 FR 42437, Sept. 12, 1975, unless otherwise noted.
Amendments
[40 FR 42437, Sept. 12, 1975, as amended at 54 FR 50385, Dec. 6, 1989]