§ 157.51. Microphone distance correction factors.

 If the distance between the microphone location point and the microphone target point is other than 50 feet (15.2 meters), the maximum observed sound level reading generated by the motor vehicle in accordance with §  157.44 (relating to measurement procedures) shall be corrected as specified in the following table:

TABLE 2
Distance Correction Factors

If the distance between the microphone location point and the microphone target point is	Sound level correction factor dB (A)
26-29 feet	-7
29-32 feet	-6
32-35 feet	-5
35-39 feet	-3
39-43 feet	-2
43-48 feet	-1
48-58 feet	0
58-70 feet	+1
70-83 feet	+2
83-99 feet	+3
99-118 feet	+4

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